RX 6700 XT - being lazy - installing with a single PCIe cable - is it really a problem?

[PeegeeTips]

Yes, I know it's not recommended.

But the PSU is a 650W Seasonic PRIME Ultra Platinum.

Am I really asking fior trouble using this in light gaming scenarios?

FYI - case is a well ventilated Silverstone FT05 case.

 

[Tetras]

Most likely it'll be fine.

 

[eeii]

If there is smoke coming from your pc then yes

 

[Mcnumpty2323]

probably be ok
but if the psu has the connectors
why settle for probably
yeah might be a bit of a PITA
to do the extra cable
but i would just do it anyway for peace of mind

 

[bimbleuk]

I believe on paper the spec is 70W + 150W from a single PCI-E cable. So depends on the PSU as I know Type 4 Corsair PSUs have been 300W capable for quite a while from a single PSU PCI-E output.

I've been using a pretty crappy Thermal Take 700W PSU with only a single PCI-E 6+8 cable with a GTX 1660, RTX 2070 SUPER & RX 7600 without issue. I did check the cable a few times initially for over heating.

If you have the choice though use 2 separate cables.

 

[humbug]

Yes, I know it's not recommended.

But the PSU is a 650W Seasonic PRIME Ultra Platinum.

Am I really asking fior trouble using this in light gaming scenarios?

FYI - case is a well ventilated Silverstone FT05 case.

Like all good PSU's the power all comes from a single 12v rail, doesn't matter how many components you plug in to it everything is powered by the same rail, that's good, cheaper PSU's have multiple 12v rails, so if for example its a 600 watt PSU with two 300 watt rails and its a 250 watt GPU with a 200 watt CPU one 8 pin GPU rail would provide 150 watts to the GPU with the other sharing the remaining 100 watts with the 200 watt CPU, now you're running the risk of overloading that second rail while the first rail has 150 watts spare.

This is why for good PSU's at least multiple rails have been phased out.

On the GPU side an 8 pin PCIe connector can load 150 watts, a 6 pin 75 watts, the PCIe slot also 75 watts BUT you shouldn't rely on that, most modern GPU's prefer to use as little of that as possible due to signalling integrity.
So it depends on the GPU, if you're using an 8 pin and the GPU doesn't pull more than 200 watts, 'at most' it should be fine, any more than that and i would use both connectors, GPU manufactures don't usually add components that aren't needed, its not cost efficient.

 

[PeegeeTips]

Thanks, all.

Sapphire rx 6700 XT Pulse with a 650W Seasonic PRIME Ultra Platinum seems like it will do okay. caveat emptor.

 

[Quartz]

Yes, I know it's not recommended.

But the PSU is a 650W Seasonic PRIME Ultra Platinum.

How thick is the wire between the PSU and the GPU?

 

[HarryBizzle]

I have installed mine with a single thus far. Have it undervolted to 1125mV and it draws 190W at max load. I’d promised myself I’d get the other cable down from the loft but I am starting to think I won’t bother.

 

[bimbleuk]

I have installed mine with a single thus far. Have it undervolted to 1125mV and it draws 190W at max load. I’d promised myself I’d get the other cable down from the loft but I am starting to think I won’t bother.

Perfect excuse for a couple of single ended cables with soft braiding and 2 or 3 combs

 

[HarryBizzle]

Perfect excuse for a couple of single ended cables with soft braiding and 2 or 3 combs

I would quite like to do this, actually, as I have an NR200 and the mobo cables have to fold back on themselves and if I'm not very careful put pressure on the end backplate of my GPU. Is there a good value (i.e. cheap but won't set my house on fire) cable company you'd recommend?

Buying new cables will also save a trip into the loft.

 

[bimbleuk]

I bought a custom 12VHPWR cable for my NRP200 MAX PSU 40mm and it cost about $30-40 and 2 weeks wait. Seems it might be $14.90 (+P&P) per PCI-E RT Series 60cm cable.

I'd link the page but that probably breaks some rule even though OCUK do sell some of the cables.

Out of interest I looked at the Seasonic 12VHPWR cable on OCUK which is PRIME compatible for £20. Interestingly though it appears to be similar to Corsair where 2 PCI-E outputs from the PSU can supply 600W so a single PCI-E 8 pin + 6 pin cable should be OK up to 300W it seems.

Seasonic PCIe 5.0 12VHPWR PSU Power Cable - Black

Order Seasonic PCIe 5.0 12VHPWR PSU Power Cable - Black now online and benefit from fast delivery.

www.overclockers.co.uk

 

[HarryBizzle]

I haven’t seen my 6700 XT go over 200W since undervolting it. No outrageous heat or noise, either. Very happy with that.