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4090 and 12VHPWR voltage question

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The replies to this topic are baffling to me. Either I'm completely misunderstanding the question, or everybody else is.

 

 

Could lower voltages cause the connector to melt?

Yes*. Power (W) = Voltage (V) * Current (I). With a constant power load if you decrease the voltage the current will increase. High current is what can cause cables to overheat.

 

Would a voltage of 11.843V on the 12V rail cause the 12VHPWR connector to melt?

It shouldn't. 11.843V is still within spec. With a 4090 at 450W power draw the current would increase from 37.5A at nominal voltage (12V) to 38A at 11.843V. An extra 0.5A on the connector shouldn't be an issue. The 12VHPWR connector is rated for 9.5A per pin, there's 6 12V pins for a total maximum current rating of 57A. (Note: The graphics card draws up to 75W from the PCIe slot, so in practice it would only be drawing 375-400W from the 12VHPWR cable - but people overclock and increase the power limit so 450W from the 12VHPWR cable isn't totally unexpected)

IIRC the melting of 12VHPWR cables was mostly attributed to poor contact between the connectors/poor contact between individual terminals.

 

 

With all that said. You can't trust software readings for voltage measurements.

The software reading you are looking at "GPU Rail Powers" is not even a voltage reading. It's just displaying data aggregated from various sensors. The minimum "GPU Rail Voltage" is the minimum voltage from any of the 12V voltage sensors. The maximum "GPU Rail Voltage" is the maximum voltage from any of the 12V sensors. GPU Rail Voltage is not an actual reading from any sensor. That's probably why there's a large swing between the minimum and maximum values. Depending on what the sensor is monitoring and where it's on the board, and just in general how accurate that sensor is, one sensor might be normal at 11.9V while another sensor might be normal at 12.2V. But when you look at the min/max across all sensors you see 11.9V and 12.2V and think that's a huge change.

 

If you click the > to expand the GPU Rail Voltage in HWinfo64 it will show you the various sensors and their values.
You can see in the image below taken from my HWinfo64 it shows the minimum voltage of 11.864V which is the minimum voltage recorded on the PCIe slot input sensor and the maximum voltage is the maximum voltage read from the GPU 8pin #2 voltage sensor. The difference between the minimum and maximum on each individual sensor is actually much smaller.

image.png

 

 

On 1/14/2025 at 10:17 AM, t40r said:

So the reason I wrote all of this out, is to ask. Is this acceptable and normal for the card? Is it something that may be starting to have a problem after using the pc for a couple years now? Should I upgrade the PSU? To my knowledge it's actually one of the better ones with full Japanese parts etc which is why I went with it.

Your power supply is fine, and it is a good quality power supply.

System Specs:

CPU: Ryzen 7 7800x3D

GPU: Gigabtye RTX 4090 OC Windforce

Mobo: MSI MAG X670E

RAM: 64GB DDR5

PSU: MSI MPG A1000G

 

 

Hey there guys, I know there isn't a "definitive answer" as to why 4090's seem to be melting other than people not plugging their power in correctly/MAYBE voltage dropping indicating something may be wrong with the cable/pus end.

 

So given that I do worry about losing this card given such an investment I started to monitor whatever I could that people were speculating about. In this case the rail voltages for the 12VHPWR cable.

 

While I am gaming on 2k monitor the cables max is 12.222 and low is 11.843. I'll attach a picture

image.png.a46b60c9c7388c0d293e370c5a86e16e.png

 

However. Last night I hooked up the pc to my 4k tv, was playing hitman (same game I'm playing now with this voltage), and I noticed it dropped to 11.73 or so. Now the reason I worry is that, I know it is under more load going to the 4k tv.

 

So the reason I wrote all of this out, is to ask. Is this acceptable and normal for the card? Is it something that may be starting to have a problem after using the pc for a couple years now? Should I upgrade the PSU? To my knowledge it's actually one of the better ones with full Japanese parts etc which is why I went with it.

 

Anyways, thanks for reading all of this and if you post/have any knowledge, thanks for helping a stressed guy out about his system.

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Yep, PSU is getting hammered pretty hard. Ow.

 

When you see 11.4 or less you will be getting reboots, should probably go PSU shopping.

 

She runs nice though, good temps.

AMD R9 9900X @ Booost | Thermalright Frozen Edge 360, 3x TL-B12
Asus Strix X670E-F | 32GB Lexar Ares @ 3000 30-36-36-68 1.35v
Zotac 4070 Ti Trinity OC @ 3045/1500 | WD SN850, SN850X, 3x SN770
Asus ProArt PA602, 2x 200x38, 1x 140x38 | Seasonic Vertex GX-1000

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13 minutes ago, t40r said:

System Specs:

CPU: Ryzen 7 7800x3D

GPU: Gigabtye RTX 4090 OC Windforce

Mobo: MSI MAG X670E

RAM: 64GB DDR5

PSU: MSI MPG A1000G

 

 

Hey there guys, I know there isn't a "definitive answer" as to why 4090's seem to be melting other than people not plugging their power in correctly/MAYBE voltage dropping indicating something may be wrong with the cable/pus end.

 

So given that I do worry about losing this card given such an investment I started to monitor whatever I could that people were speculating about. In this case the rail voltages for the 12VHPWR cable.

 

While I am gaming on 2k monitor the cables max is 12.222 and low is 11.843. I'll attach a picture

image.png.a46b60c9c7388c0d293e370c5a86e16e.png

 

However. Last night I hooked up the pc to my 4k tv, was playing hitman (same game I'm playing now with this voltage), and I noticed it dropped to 11.73 or so. Now the reason I worry is that, I know it is under more load going to the 4k tv.

 

So the reason I wrote all of this out, is to ask. Is this acceptable and normal for the card? Is it something that may be starting to have a problem after using the pc for a couple years now? Should I upgrade the PSU? To my knowledge it's actually one of the better ones with full Japanese parts etc which is why I went with it.

 

Anyways, thanks for reading all of this and if you post/have any knowledge, thanks for helping a stressed guy out about his system.

From what I've read voltage isn't an issue with 4090 -it was with Intel 13/14th- but a dumb issue with cables too thin to stand the amps, getting hot and if bent or badly plugged they end up burning ...

And anyway power cleanness comes from the PSU the card just uses it

So your whole voltage worries don't have to even exist

 

AMD R9  7950X3D CPU/ Asus ROG STRIX X670E-E board/ 2x32GB G-Skill Trident Z Neo 6000CL30 RAM ASUS TUF Gaming AMD Radeon RX 7900 XTX OC Edition GPU/ Phanteks P600S case /  Arctic Liquid Freezer III 360 ARGB cooler/  2TB WD SN850 NVme + 2TB Crucial T500  NVme  + 4TB Toshiba X300 HDD / Corsair RM850x PSU/ Alienware AW3420DW 34" 120Hz 3440x1440p monitor / ASUS ROG AZOTH keyboard/ Logitech G PRO X Superlight mouse / Audeze Maxwell headphones

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43 minutes ago, freeagent said:

Yep, PSU is getting hammered pretty hard. Ow.

 

When you see 11.4 or less you will be getting reboots, should probably go PSU shopping.

 

She runs nice though, good temps.

So to clarify are you saying that my PSU is just under load and working fine? BUT If I see it drop to 11.4 or so then start shopping? Or should I go ahead and plan on getting a new PSU sooner than later? IE: Ordering one within the week

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1 hour ago, freeagent said:

Yep, PSU is getting hammered pretty hard. Ow.

 

When you see 11.4 or less you will be getting reboots, should probably go PSU shopping.

 

She runs nice though, good temps.

1 hour ago, Agall said:

Yeah don't do that.

58 minutes ago, PDifolco said:

From what I've read voltage isn't an issue with 4090 -it was with Intel 13/14th- but a dumb issue with cables too thin to stand the amps, getting hot and if bent or badly plugged they end up burning ...

And anyway power cleanness comes from the PSU the card just uses it

So your whole voltage worries don't have to even exist

 

 

Isn't 4090 lower voltage on 4K, because 4K is harder to drive, so even though you get more GPU demand, you get less FPS?

Note: Users receive notifications after Mentions & Quotes. 

Feel free: To ask any question, no matter what question it is, I will try to answer. I know a lot about PCs but not everything.

current PC:

Ryzen 5 5600 |16GB DDR4 3200Mhz | B450 | GTX 1080 ti [further details on my profile]

PCs I used before:

  1. Pentium G4500 | 4GB/8GB DDR4 2133Mhz | H110 | GTX 1050
  2. Ryzen 3 1200 3,5Ghz / OC:4Ghz | 8GB DDR4 2133Mhz / 16GB 3200Mhz | B450 | GTX 1050
  3. Ryzen 3 1200 3,5Ghz | 16GB 3200Mhz | B450 | GTX 1080 ti
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Been gaming on a 4090 for nearly two years now. This is it in Cyberpunk at 4K full path tracing.

 

image.png.b7a26ce9c15299b03424baee6452de12.png

Ryzen 7 7800x3D -  Asus RTX4090 TUF OC- Asrock X670E Taichi - 32GB DDR5-6000CL30 - SuperFlower 1000W - Fractal Torrent - Assassin IV - 42" LG C2

Ryzen 7 5800x - XFX RX6600 - Asus STRIX B550i - 32GB DDR4-3200CL14 - Corsair SF750 - Lian Li O11 Mini - EK 360 AIO - Asus PG348Q

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My puny 4070Ti..

 

Screenshot2025-01-13192930.jpg.f66dd7def64ab0fca401b1b4e98d2e90.jpg

AMD R9 9900X @ Booost | Thermalright Frozen Edge 360, 3x TL-B12
Asus Strix X670E-F | 32GB Lexar Ares @ 3000 30-36-36-68 1.35v
Zotac 4070 Ti Trinity OC @ 3045/1500 | WD SN850, SN850X, 3x SN770
Asus ProArt PA602, 2x 200x38, 1x 140x38 | Seasonic Vertex GX-1000

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4 hours ago, podkall said:

 

Isn't 4090 lower voltage on 4K, because 4K is harder to drive, so even though you get more GPU demand, you get less FPS?

WAIT is that how that works?! I could theoretically seeing that making sense, but I would assume prior to this conversation that "Harder higher graphical games/resolutions would require more power" but in a weird twist in my brain I can also understand what you're saying

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4 hours ago, GuiltySpark_ said:

Been gaming on a 4090 for nearly two years now. This is it in Cyberpunk at 4K full path tracing.

 

image.png.b7a26ce9c15299b03424baee6452de12.png

That makes me feel better, that's about what mine looked like. Hitman 3 is quite taxing with all of the new path tracing and such features. Thanks for sharing yours, and given that it's another brand, makes me feel even more better.

 

EDIT

 

Sorry I guess I could have multi-quoted... been a while since I've been on forums

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10 hours ago, t40r said:

WAIT is that how that works?! I could theoretically seeing that making sense, but I would assume prior to this conversation that "Harder higher graphical games/resolutions would require more power" but in a weird twist in my brain I can also understand what you're saying

I can understand that voltage can be lower with less fps, because GPU coil-whine scales with fps too

Note: Users receive notifications after Mentions & Quotes. 

Feel free: To ask any question, no matter what question it is, I will try to answer. I know a lot about PCs but not everything.

current PC:

Ryzen 5 5600 |16GB DDR4 3200Mhz | B450 | GTX 1080 ti [further details on my profile]

PCs I used before:

  1. Pentium G4500 | 4GB/8GB DDR4 2133Mhz | H110 | GTX 1050
  2. Ryzen 3 1200 3,5Ghz / OC:4Ghz | 8GB DDR4 2133Mhz / 16GB 3200Mhz | B450 | GTX 1050
  3. Ryzen 3 1200 3,5Ghz | 16GB 3200Mhz | B450 | GTX 1080 ti
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5 hours ago, podkall said:

I can understand that voltage can be lower with less fps, because GPU coil-whine scales with fps too

lol that's a really funny and good way to put that "coil-whine scales with fps" it really does! Thanks for the insight 🙂

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22 hours ago, podkall said:

sn't 4090 lower voltage on 4K

4K is all GPU. I play at 4K 60 and concessions have to be made in certain games 😄

AMD R9 9900X @ Booost | Thermalright Frozen Edge 360, 3x TL-B12
Asus Strix X670E-F | 32GB Lexar Ares @ 3000 30-36-36-68 1.35v
Zotac 4070 Ti Trinity OC @ 3045/1500 | WD SN850, SN850X, 3x SN770
Asus ProArt PA602, 2x 200x38, 1x 140x38 | Seasonic Vertex GX-1000

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1 minute ago, freeagent said:

4K is all GPU. I play at 4K 60 and concessions have to be made in certain games 😄

yeah, but you get less FPS, which will change GPU's behavior, regardless if it's demanded 3x of it's effort

Note: Users receive notifications after Mentions & Quotes. 

Feel free: To ask any question, no matter what question it is, I will try to answer. I know a lot about PCs but not everything.

current PC:

Ryzen 5 5600 |16GB DDR4 3200Mhz | B450 | GTX 1080 ti [further details on my profile]

PCs I used before:

  1. Pentium G4500 | 4GB/8GB DDR4 2133Mhz | H110 | GTX 1050
  2. Ryzen 3 1200 3,5Ghz / OC:4Ghz | 8GB DDR4 2133Mhz / 16GB 3200Mhz | B450 | GTX 1050
  3. Ryzen 3 1200 3,5Ghz | 16GB 3200Mhz | B450 | GTX 1080 ti
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57 minutes ago, podkall said:

yeah, but you get less FPS, which will change GPU's behavior, regardless if it's demanded 3x of it's effort

I get peak power use at 4K. Everything else under it is easy.

AMD R9 9900X @ Booost | Thermalright Frozen Edge 360, 3x TL-B12
Asus Strix X670E-F | 32GB Lexar Ares @ 3000 30-36-36-68 1.35v
Zotac 4070 Ti Trinity OC @ 3045/1500 | WD SN850, SN850X, 3x SN770
Asus ProArt PA602, 2x 200x38, 1x 140x38 | Seasonic Vertex GX-1000

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2 hours ago, freeagent said:

I get peak power use at 4K. Everything else under it is easy.

we're not talking max power

Note: Users receive notifications after Mentions & Quotes. 

Feel free: To ask any question, no matter what question it is, I will try to answer. I know a lot about PCs but not everything.

current PC:

Ryzen 5 5600 |16GB DDR4 3200Mhz | B450 | GTX 1080 ti [further details on my profile]

PCs I used before:

  1. Pentium G4500 | 4GB/8GB DDR4 2133Mhz | H110 | GTX 1050
  2. Ryzen 3 1200 3,5Ghz / OC:4Ghz | 8GB DDR4 2133Mhz / 16GB 3200Mhz | B450 | GTX 1050
  3. Ryzen 3 1200 3,5Ghz | 16GB 3200Mhz | B450 | GTX 1080 ti
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The replies to this topic are baffling to me. Either I'm completely misunderstanding the question, or everybody else is.

 

 

Could lower voltages cause the connector to melt?

Yes*. Power (W) = Voltage (V) * Current (I). With a constant power load if you decrease the voltage the current will increase. High current is what can cause cables to overheat.

 

Would a voltage of 11.843V on the 12V rail cause the 12VHPWR connector to melt?

It shouldn't. 11.843V is still within spec. With a 4090 at 450W power draw the current would increase from 37.5A at nominal voltage (12V) to 38A at 11.843V. An extra 0.5A on the connector shouldn't be an issue. The 12VHPWR connector is rated for 9.5A per pin, there's 6 12V pins for a total maximum current rating of 57A. (Note: The graphics card draws up to 75W from the PCIe slot, so in practice it would only be drawing 375-400W from the 12VHPWR cable - but people overclock and increase the power limit so 450W from the 12VHPWR cable isn't totally unexpected)

IIRC the melting of 12VHPWR cables was mostly attributed to poor contact between the connectors/poor contact between individual terminals.

 

 

With all that said. You can't trust software readings for voltage measurements.

The software reading you are looking at "GPU Rail Powers" is not even a voltage reading. It's just displaying data aggregated from various sensors. The minimum "GPU Rail Voltage" is the minimum voltage from any of the 12V voltage sensors. The maximum "GPU Rail Voltage" is the maximum voltage from any of the 12V sensors. GPU Rail Voltage is not an actual reading from any sensor. That's probably why there's a large swing between the minimum and maximum values. Depending on what the sensor is monitoring and where it's on the board, and just in general how accurate that sensor is, one sensor might be normal at 11.9V while another sensor might be normal at 12.2V. But when you look at the min/max across all sensors you see 11.9V and 12.2V and think that's a huge change.

 

If you click the > to expand the GPU Rail Voltage in HWinfo64 it will show you the various sensors and their values.
You can see in the image below taken from my HWinfo64 it shows the minimum voltage of 11.864V which is the minimum voltage recorded on the PCIe slot input sensor and the maximum voltage is the maximum voltage read from the GPU 8pin #2 voltage sensor. The difference between the minimum and maximum on each individual sensor is actually much smaller.

image.png

 

 

On 1/14/2025 at 10:17 AM, t40r said:

So the reason I wrote all of this out, is to ask. Is this acceptable and normal for the card? Is it something that may be starting to have a problem after using the pc for a couple years now? Should I upgrade the PSU? To my knowledge it's actually one of the better ones with full Japanese parts etc which is why I went with it.

Your power supply is fine, and it is a good quality power supply.

CPU: Intel i7 6700k  | Motherboard: Gigabyte Z170x Gaming 5 | RAM: 2x16GB 3000MHz Corsair Vengeance LPX | GPU: Gigabyte Aorus GTX 1080ti | PSU: Corsair RM750x (2018) | Case: BeQuiet SilentBase 800 | Cooler: Arctic Freezer 34 eSports | SSD: Samsung 970 Evo 500GB + Samsung 840 500GB + Crucial MX500 2TB | Monitor: Acer Predator XB271HU + Samsung BX2450

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39 minutes ago, Spotty said:

Either I'm completely misunderstanding the question

Yes.

AMD R9 9900X @ Booost | Thermalright Frozen Edge 360, 3x TL-B12
Asus Strix X670E-F | 32GB Lexar Ares @ 3000 30-36-36-68 1.35v
Zotac 4070 Ti Trinity OC @ 3045/1500 | WD SN850, SN850X, 3x SN770
Asus ProArt PA602, 2x 200x38, 1x 140x38 | Seasonic Vertex GX-1000

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6 hours ago, Spotty said:

The replies to this topic are baffling to me. Either I'm completely misunderstanding the question, or everybody else is.

 

 

Could lower voltages cause the connector to melt?

Yes*. Power (W) = Voltage (V) * Current (I). With a constant power load if you decrease the voltage the current will increase. High current is what can cause cables to overheat.

 

Would a voltage of 11.843V on the 12V rail cause the 12VHPWR connector to melt?

It shouldn't. 11.843V is still within spec. With a 4090 at 450W power draw the current would increase from 37.5A at nominal voltage (12V) to 38A at 11.843V. An extra 0.5A on the connector shouldn't be an issue. The 12VHPWR connector is rated for 9.5A per pin, there's 6 12V pins for a total maximum current rating of 57A. (Note: The graphics card draws up to 75W from the PCIe slot, so in practice it would only be drawing 375-400W from the 12VHPWR cable - but people overclock and increase the power limit so 450W from the 12VHPWR cable isn't totally unexpected)

IIRC the melting of 12VHPWR cables was mostly attributed to poor contact between the connectors/poor contact between individual terminals.

 

 

With all that said. You can't trust software readings for voltage measurements.

The software reading you are looking at "GPU Rail Powers" is not even a voltage reading. It's just displaying data aggregated from various sensors. The minimum "GPU Rail Voltage" is the minimum voltage from any of the 12V voltage sensors. The maximum "GPU Rail Voltage" is the maximum voltage from any of the 12V sensors. GPU Rail Voltage is not an actual reading from any sensor. That's probably why there's a large swing between the minimum and maximum values. Depending on what the sensor is monitoring and where it's on the board, and just in general how accurate that sensor is, one sensor might be normal at 11.9V while another sensor might be normal at 12.2V. But when you look at the min/max across all sensors you see 11.9V and 12.2V and think that's a huge change.

 

If you click the > to expand the GPU Rail Voltage in HWinfo64 it will show you the various sensors and their values.
You can see in the image below taken from my HWinfo64 it shows the minimum voltage of 11.864V which is the minimum voltage recorded on the PCIe slot input sensor and the maximum voltage is the maximum voltage read from the GPU 8pin #2 voltage sensor. The difference between the minimum and maximum on each individual sensor is actually much smaller.

image.png

 

 

Your power supply is fine, and it is a good quality power supply.

God I could kiss you YES this is the response I was hoping for, I've been hearing more coil whine as of late, but also playing more intense games and seeing that number made me put two and two together which is likely not the case here. I also did not know you could expand that further to see the input voltages, which as you said DO in fact show a much smaller gap between the minimum and maximum(say .2 each instead of thinking it was a .4 gap across the board). While I also understand it isn't the true readings only likely close to them, it does make me feel a bit better.

 

Secondly, thank you for breaking it down this way, this is the information I was hoping for, the breakdown, and being through enough to explain everything from the starting point of the information, rather than the middle/end of it.

 

Lastly, this quesiton may be a "the world may never know and it is a case by case basis type deal". When is the time to worry? (Lowest I saw mine for instance was 11.77~ so I guess I'm just trying to get a barometer for when to panic.) When I start having blue screens/system instability? I guess this whole melting of the stupid 12v 600watt connector being a relatively new issue (graphics card issue wise), it tends to be in the back of my mind quite a bit. Simply because the price point of the part and repairing/replacing it costs quite a bit of change. Or is it just "ride it until it dies" lol, which is a fair sentiment too.

 

Anyways, truly thank you kind sir or maddam

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7 minutes ago, t40r said:

I've been hearing more coil whine as of late, but also playing more intense games and seeing that number made me put two and two together which is likely not the case here.

Coil whine can be tricky. I used to have a graphics card that would have horrible coil whine while playing Crysis and in the main menu screen of another game (I forget which), but would be perfectly fine in any other games. It doesn't surprise me that playing a different game or playing at a different resolution has caused some coil whine where it wasn't before. Since you only have coil whine under certain circumstances you may have some luck reducing the coil whine by tinkering with the graphical settings in game like setting a max FPS limit or changing settings like anti aliasing or the resolution. You could also try tweaking the core clock speed or power target in software like MSI Afterburner and see if that helps.

Coil whine is completely harmless in terms of the system and isn't a sign of anything being wrong with the PC, it's just annoying to listen to.

 

10 minutes ago, t40r said:

Lastly, this quesiton may be a "the world may never know and it is a case by case basis type deal". When is the time to worry? When I start having blue screens/system instability? I guess this whole melting of the stupid 12v 600watt connector being a relatively new issue (graphics card issue wise), it tends to be in the back of my mind quite a bit. Simply because the price point of the part and repairing/replacing it costs quite a bit of change. Or is it just "ride it until it dies" lol, which is a fair sentiment too.

If you're worried about the 12VHPWR cable, check that it's plugged in firmly and that the connector that plugs in to the graphics card isn't being twisted, pulled, or pushed. If there's some force pushing/pulling on the connector it can result in poor contact between the pins inside the connector and the connector it's mating to. As long as it's not being bent or anything the connection should be good.

If you're getting blue screens or crashes it might not be GPU related at all (depending on the type of BSOD/crash - lots of issues can cause instability). If you do start to get those problems just post in the Troubleshooting section with details and go from there.

I wouldn't be too concerned about it to be honest. Enjoy the PC.

CPU: Intel i7 6700k  | Motherboard: Gigabyte Z170x Gaming 5 | RAM: 2x16GB 3000MHz Corsair Vengeance LPX | GPU: Gigabyte Aorus GTX 1080ti | PSU: Corsair RM750x (2018) | Case: BeQuiet SilentBase 800 | Cooler: Arctic Freezer 34 eSports | SSD: Samsung 970 Evo 500GB + Samsung 840 500GB + Crucial MX500 2TB | Monitor: Acer Predator XB271HU + Samsung BX2450

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