Pcie cables for gpu

[AnD420]

Today I bought a ftw3 3080 , and I didn’t realise my Be Quiet Pure Power 12 M 750w power supply only had 2 pcie connectors each with a splitter while my gpu has 3 8pin connectors, after some digging I connected slots 1 and 3 with 1 cable and middle slot with the other. Now my question is since the card draws under superposition benchmark around 380watts and in games around 250-320watts will I be fine leaving it with the splitter or should I look to upgrade my psu.(I already undervolted the card to 893mv with a 1950clock)

[Hinjima]

4 minutes ago, AnD420 said:

Today I bought a ftw3 3080 , and I didn’t realise my Be Quiet Pure Power 12 M 750w power supply only had 2 pcie connectors each with a splitter while my gpu has 3 8pin connectors, after some digging I connected slots 1 and 3 with 1 cable and middle slot with the other. Now my question is since the card draws under superposition benchmark around 380watts and in games around 250-320watts will I be fine leaving it with the splitter or should I look to upgrade my psu.(I already undervolted the card to 893mv with a 1950clock)

The Be Quiet Pure Power 12 M is a quality PSU with good enough daisychain / splitter cables for this to be completely safe and correct to do

 

[AnD420]

Can you expand so I can understand why some psu can do that and others not 

[Hinjima]

7 minutes ago, AnD420 said:

Can you expand so I can understand why some psu can do that and others not 

DaisyChaining or splitter cable is mostly seen as a negative way of doing it but this was more of an issue back in 2006 with terrible power supplies.   I daisychained my 2080 Super with 1x2 splitter cable and I am doing it with my RTX 4080 because I know my RM750i from Corsair use great cables.

Modern high quality PSU's use better cables than lets say a 50 dollars 850w power supply and provide better / cleaner power.

I am definitely the wrong person to ask if you want an absolute indepth answer on how PSU's work and convert power/ voltage, I just have a basic understanding and I do know what PSU's are good and what units are bad.

 

I wouldn't do this with a cheap PSU on the C:Tier in the PSU Tierlist.

https://cultists.network/140/psu-tier-list/

[Bagzie]

1 hour ago, AnD420 said:

Today I bought a ftw3 3080 , and I didn’t realise my Be Quiet Pure Power 12 M 750w power supply only had 2 pcie connectors each with a splitter while my gpu has 3 8pin connectors, after some digging I connected slots 1 and 3 with 1 cable and middle slot with the other. Now my question is since the card draws under superposition benchmark around 380watts and in games around 250-320watts will I be fine leaving it with the splitter or should I look to upgrade my psu.(I already undervolted the card to 893mv with a 1950clock)

A couple of things here.

 

I can't find that much information on your power supply so I can only speculate.

 

Corsair daisy chained cables are rated at 300w on the psu side connector , The daisy chained wires are 16awg upto the split and 18awg after (smaller awg = thicker wires)

 

So the psu connector and the cables are both rated for 150w on both connectors even in a daisy chain.

 

People like to say they are rated at 150w per the entire daisy chain which for a decent psu is just not true.

 

 

 

[Sion3951]

1 hour ago, AnD420 said:

Can you expand so I can understand why some psu can do that and others not 

This video contains a bit of information about it - https://www.youtube.com/watch?v=p0fW5SLFphU

 

I don't claim to know much at all about it, but as far as the cables are rated you should be fine to have it all run off one cable, The limit will be in what each of the individual connectors can take (as they are rated for less power delivery). So in theory as far as the cable in concerned you are fine to have a single cable plugged in with two of the connectors (which is what my 3080 comes with and has been fine with). Though of course more cables and more connectors used is safer (and may be more stable but I have no idea about that)

 

What is going to limit it one some power supplies is the internals of the power supply might not be rated to do enough power through one cable (something to do with the 12V rail I think).

 

As far as I have been able to tell with most modern power supplies as long as they are from a brand you have heard of you will pretty much be fine as long as you are within the Watt limit (750 with yours, which is fine for most PCs that arent overclocked)

 

A new PSU is obviously safer but shouldnt be needed in your case.

[Bagzie]

28 minutes ago, Sion3951 said:

This video contains a bit of information about it - https://www.youtube.com/watch?v=p0fW5SLFphU

 

I don't claim to know much at all about it, but as far as the cables are rated you should be fine to have it all run off one cable, The limit will be in what each of the individual connectors can take (as they are rated for less power delivery). So in theory as far as the cable in concerned you are fine to have a single cable plugged in with two of the connectors (which is what my 3080 comes with and has been fine with). Though of course more cables and more connectors used is safer (and may be more stable but I have no idea about that)

 

What is going to limit it one some power supplies is the internals of the power supply might not be rated to do enough power through one cable (something to do with the 12V rail I think).

 

As far as I have been able to tell with most modern power supplies as long as they are from a brand you have heard of you will pretty much be fine as long as you are within the Watt limit (750 with yours, which is fine for most PCs that arent overclocked)

 

A new PSU is obviously safer but shouldnt be needed in your case.

Most modern psus have a single 12v rail that can send pretty much the entire power supply amperage through it if needed.

 

Some are switchable like mine so they can do dual rail or single rail.