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Shadowman

No heat at all from gpu by removing cables?

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Posted · Original PosterOP

Since I have a custom water cooled PC thought best to post here. Basically am currently water cooling my cpu and gpu but my question was (sorry will sound silly) I want to leave the gpu in the water loop but if I remove the power cables for the gpu that would mean no power going to the gpu will that obviously mean there should be no heat coming from the gpu? I mean even on idle am sure the gpu is giving out heat?  It's because  I want to just test my cpu under full load and without the gpu in the loop and see the temps (I have a old air cooled gpu which I will use to run the test)

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Just now, Shadowman said:

Since I have a custom water cooled PC thought best to post here. Basically am currently water cooling my cpu and gpu but my question was (sorry will sound silly) if I remove the power cables for the gpu that would mean no power going to the gpu will that obviously mean there should be no heat coming from the gpu? I mean even on idle am sure the you is giving out heat?  It's because  I want to just test my cpu under full load and without a gpu in the and see the temps (I have a old air cooled gpu which I will use to run the test)

Your GPU will still receive up to 75w from the PCIe slot itself, specifically to display something.  If you remove the cables and set BIOS to the iGPU and use just the CPU to display then I don't think it will power the GPU.  


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Ryzen Rig 2: ASrock B450 Pro4 ATX, Ryzen 7 1700 @ 4.2ghz all core 1.4vCore, AMD R9 Fury X w/ Swiftech KOMODO waterblock, Custom Loop 2x240mm + 1x120mm radiators in push/pull 16gb (2x8) 3600mhz V-Color Skywalker (or 4x8gb DDR4 2666mhz for large tasks), Corsair HX850 PSU, 128gb Patriot Scorch NVMe Win 10 boot drive, 500gb Samsung 840 EVO SSD, CoolerMaster HAF XM Case.  DSI 90-Key Mechanical Keyboard w/ Cherry Red switches, Zalman ZM-GM1 mouse, Hannspree HF207 and Acer AL2016W monitors

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Dwight: The Mixed Metals Loop Media Center.  Ask me about it.  Currently decommissioned to move to an mATX setup on a new MOBO once I pick one out

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Micro Form Factor Dell OptiPlex 3040: Dell 0MGK50 A02, i3-6100T, 2x4gb DDR3 1600, Team Group 120gb SSD, 500gb Seagate 7mm HDD attached storage, Windows 10 Pro, Logitech K400+, USB Wifi adapter all vesa mounted to the back of a 37" 1080p TV for form factor in the kitchen

Linux Box: Toshiba Laptop, i7 620M, NVS graphics, 2gb ram tinker toy at the moment.  Running Manjaro at the moment

APU Laptop: I need to clean this things TIM up so it can boot into Windows 7 for more than 5 minute before overheating at idle, it has things, I just haven't been on it in 2 years or so

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Posted · Original PosterOP
5 minutes ago, Tristerin said:

Your GPU will still receive up to 75w from the PCIe slot itself, specifically to display something.  If you remove the cables and set BIOS to the iGPU and use just the CPU to display then I don't think it will power the GPU.  

Thanks, sorry forgot to mention my motherboard is a x299 no iGPU on there but have a old gpu will use that. My current gpu is the rtx 2080ti but will the PCIe slot be able to power it up without the PCIe cables plugged in? 

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Just now, Shadowman said:

Thanks, sorry forgot to mention my motherboard is a x299 no GPU on there but have a old gpu will use that. My current gpu is the rtx 2080ti but will the PCIe slow be able to power it up without the PCIe cables plugged in? 

So no iGPU, but have an old GPU to just use as a display in a diff PCIe slot?  I don't see why this would be an issue.  It wont be able to render 3d but it will be able to power the 2d desktop no problem at all.


Workstation Laptop: Dell Precision 7540, Xeon E-2276M, 32gb DDR4, Quadro T2000 GPU, 4k display

Ryzen Rig 2: ASrock B450 Pro4 ATX, Ryzen 7 1700 @ 4.2ghz all core 1.4vCore, AMD R9 Fury X w/ Swiftech KOMODO waterblock, Custom Loop 2x240mm + 1x120mm radiators in push/pull 16gb (2x8) 3600mhz V-Color Skywalker (or 4x8gb DDR4 2666mhz for large tasks), Corsair HX850 PSU, 128gb Patriot Scorch NVMe Win 10 boot drive, 500gb Samsung 840 EVO SSD, CoolerMaster HAF XM Case.  DSI 90-Key Mechanical Keyboard w/ Cherry Red switches, Zalman ZM-GM1 mouse, Hannspree HF207 and Acer AL2016W monitors

https://www.3dmark.com/3dm/37004594?

Ryzen Rig 1: ASUS B350-PRIME ATX, Ryzen 7 1700, Sapphire R9 Fury Tri-X Nitro 4gb HBM, 16gb (2x8) 3200mhz V-Color Skywalker, ANTEC Earthwatts 750w PSU, MasterLiquid Lite 120 AIO cooler in Push/Pull config as rear exhaust, 250gb Samsung 850 Evo SSD, Patriot Burst 240gb SSD, Cougar MX330-X Case.  Zalman K600S keyboard, Zalman ZM-GM1 mouse, Acer XF270HU 2560x1440 144hz IPS monitor

https://www.3dmark.com/3dm/37628874?

Dwight: The Mixed Metals Loop Media Center.  Ask me about it.  Currently decommissioned to move to an mATX setup on a new MOBO once I pick one out

Schrute: ASUS M5A99FX Pro R2.0, FX 8350, 2x Gigabyte HD 7850 2gb GPUs in crossfire, 16gb (4x4) Corsair Vengeance DDR3 1600mhz, Sparkle/FSP 650w PSU, PCCOOLING 160w TDP air cooler, 60gb Patriot SSD Win 10 boot drive, 1tb WDBlack HDD, Rosewill Nautilus 1.0 case.  Logitech Wireless Keyboard and Mouse, Roku 55" 4k TV

Micro Form Factor Dell OptiPlex 3040: Dell 0MGK50 A02, i3-6100T, 2x4gb DDR3 1600, Team Group 120gb SSD, 500gb Seagate 7mm HDD attached storage, Windows 10 Pro, Logitech K400+, USB Wifi adapter all vesa mounted to the back of a 37" 1080p TV for form factor in the kitchen

Linux Box: Toshiba Laptop, i7 620M, NVS graphics, 2gb ram tinker toy at the moment.  Running Manjaro at the moment

APU Laptop: I need to clean this things TIM up so it can boot into Windows 7 for more than 5 minute before overheating at idle, it has things, I just haven't been on it in 2 years or so

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Posted · Original PosterOP
1 minute ago, Tristerin said:

So no iGPU, but have an old GPU to just use as a display in a diff PCIe slot?  I don't see why this would be an issue.  It wont be able to render 3d but it will be able to power the 2d desktop no problem at all.

I think there is a option on the motherboard to disable pcie slots? It's just I don't want any power going into the gpu which would mean no heat would be coming from it.

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3 minutes ago, Shadowman said:

I think there is a option on the motherboard to disable pcie slots? It's just I don't want any power going into the gpu which would mean no heat would be coming from it.

Maybe your mobo has that option, Im unaware (nor have I tried to ever do this) - try it, and use HWMonitor to see if anything is detecting that GPU


Workstation Laptop: Dell Precision 7540, Xeon E-2276M, 32gb DDR4, Quadro T2000 GPU, 4k display

Ryzen Rig 2: ASrock B450 Pro4 ATX, Ryzen 7 1700 @ 4.2ghz all core 1.4vCore, AMD R9 Fury X w/ Swiftech KOMODO waterblock, Custom Loop 2x240mm + 1x120mm radiators in push/pull 16gb (2x8) 3600mhz V-Color Skywalker (or 4x8gb DDR4 2666mhz for large tasks), Corsair HX850 PSU, 128gb Patriot Scorch NVMe Win 10 boot drive, 500gb Samsung 840 EVO SSD, CoolerMaster HAF XM Case.  DSI 90-Key Mechanical Keyboard w/ Cherry Red switches, Zalman ZM-GM1 mouse, Hannspree HF207 and Acer AL2016W monitors

https://www.3dmark.com/3dm/37004594?

Ryzen Rig 1: ASUS B350-PRIME ATX, Ryzen 7 1700, Sapphire R9 Fury Tri-X Nitro 4gb HBM, 16gb (2x8) 3200mhz V-Color Skywalker, ANTEC Earthwatts 750w PSU, MasterLiquid Lite 120 AIO cooler in Push/Pull config as rear exhaust, 250gb Samsung 850 Evo SSD, Patriot Burst 240gb SSD, Cougar MX330-X Case.  Zalman K600S keyboard, Zalman ZM-GM1 mouse, Acer XF270HU 2560x1440 144hz IPS monitor

https://www.3dmark.com/3dm/37628874?

Dwight: The Mixed Metals Loop Media Center.  Ask me about it.  Currently decommissioned to move to an mATX setup on a new MOBO once I pick one out

Schrute: ASUS M5A99FX Pro R2.0, FX 8350, 2x Gigabyte HD 7850 2gb GPUs in crossfire, 16gb (4x4) Corsair Vengeance DDR3 1600mhz, Sparkle/FSP 650w PSU, PCCOOLING 160w TDP air cooler, 60gb Patriot SSD Win 10 boot drive, 1tb WDBlack HDD, Rosewill Nautilus 1.0 case.  Logitech Wireless Keyboard and Mouse, Roku 55" 4k TV

Micro Form Factor Dell OptiPlex 3040: Dell 0MGK50 A02, i3-6100T, 2x4gb DDR3 1600, Team Group 120gb SSD, 500gb Seagate 7mm HDD attached storage, Windows 10 Pro, Logitech K400+, USB Wifi adapter all vesa mounted to the back of a 37" 1080p TV for form factor in the kitchen

Linux Box: Toshiba Laptop, i7 620M, NVS graphics, 2gb ram tinker toy at the moment.  Running Manjaro at the moment

APU Laptop: I need to clean this things TIM up so it can boot into Windows 7 for more than 5 minute before overheating at idle, it has things, I just haven't been on it in 2 years or so

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if its not hard tubrng, then just take the GPU out of the the pcie slot and let it sit there. that way you will know for sure its not doing anything. 

 

that way you dont have to disassemble the loop and you wont mix gpu temps into the loop


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Posted · Original PosterOP
Just now, mok said:

if its not hard tubring, then just take the GPU out of the the pcie slot and let it sit there. that way you will know for sure its not doing anything. 

 

that way you dont have to disassemble the loop and you wont mix gpu temps into the loop

Yes it is hard tubing. 

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ANY card will receive power through the pci-e slot.

 

Most video cards will start up without any additional pci-e power connectors but in a "reduced" mode, just to display a text that says something like "please turn off your pc and insert the power cables into the video card".

 

It's designed like that to prevent people from returning perfectly good hardware or sending it to warranty for not showing anything on monitor, because they forgot to insert the required extra power connectors. 

 

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Posted · Original PosterOP
6 minutes ago, mariushm said:

ANY card will receive power through the pci-e slot.

 

Most video cards will start up without any additional pci-e power connectors but in a "reduced" mode, just to display a text that says something like "please turn off your pc and insert the power cables into the video card".

 

It's designed like that to prevent people from returning perfectly good hardware or sending it to warranty for not showing anything on monitor, because they forgot to insert the required extra power connectors. 

 

But would disabling the pcie slot that has the gpu in it via the motherboard send any power?

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Yeah, the slot will still receive power.

There's 3.3v aux (kind of like stand-by power) , 3.3v ( up to 10w, incl the 3.3v aux)  and 12v (up to around 65w)

 

There's usually no power switches on each pci-e slot to turn off power.

I think what the bios says by disabling pci-e slots is more or less that it won't query the device in the slot to ask what it is (if it's video card or something else), and it won't send it the command to initialize and all that, and it won't tell the operating system that there's something plugged into the slot). Whatever is inserted into the slot is just waiting for the bios to say "hello" and exchange information that's needed for the card to initialize.

So the card will still get power from the pci-e no matter what but until it's "initialized" it may only use a very small amount of energy, only what it gets from 3.3v for example.

 

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