Cables on Thermaltake PF3 PSU enough for 3090?

[CephDigital]

Hi there! 

 

So I have a Thermalright PF3 750W PSU and an MSI RTX 3090 Trio (on a waterblock) and an AMD Ryzen 7 7800X3D. 

 

I know the Nvidia website recommends a 750W PSU but the cables themselves is what concerns me, as it requires 3 x 8 pin PCIE connectors and I've heard of the 3090 pulling more than 300W of power. The PSU has 2 connectors on itself for PCIE cables that each split into 2 PCIE connectors. That's still only 300W of power. Is this going to be fine or should I return my PSU? There's also a 12VHPWR connector on the PSU but I can't find an adapter to convert it to PCIE ports.

 

I'm in the UK if that helps. 

[wildgg]

17 minutes ago, CephDigital said:

Hi there! 

 

So I have a Thermalright PF3 750W PSU and an MSI RTX 3090 Trio (on a waterblock) and an AMD Ryzen 7 7800X3D. 

 

I know the Nvidia website recommends a 750W PSU but the cables themselves is what concerns me, as it requires 3 x 8 pin PCIE connectors and I've heard of the 3090 pulling more than 300W of power. The PSU has 2 connectors on itself for PCIE cables that each split into 2 PCIE connectors. That's still only 300W of power. Is this going to be fine or should I return my PSU? There's also a 12VHPWR connector on the PSU but I can't find an adapter to convert it to PCIE ports.

 

I'm in the UK if that helps. 

altho im not a fan of those splitter cables personally, you should be fine as you're also getting 75W from the pci slot.

[igormp]

46 minutes ago, CephDigital said:

Hi there! 

 

So I have a Thermalright PF3 750W PSU and an MSI RTX 3090 Trio (on a waterblock) and an AMD Ryzen 7 7800X3D. 

 

I know the Nvidia website recommends a 750W PSU but the cables themselves is what concerns me, as it requires 3 x 8 pin PCIE connectors and I've heard of the 3090 pulling more than 300W of power. The PSU has 2 connectors on itself for PCIE cables that each split into 2 PCIE connectors. That's still only 300W of power. Is this going to be fine or should I return my PSU? There's also a 12VHPWR connector on the PSU but I can't find an adapter to convert it to PCIE ports.

 

I'm in the UK if that helps. 

Each 8-pin connector by spec supports 150W, but I would believe that they have some extra leeway up to ~200W or so. Your GPU at stock is rated for 370W, if you count the 75W from the PCIe slot you have 150+150+75= 375W.

 

FWIW, my 3090s are 2x8-pin only and can go up to 370W, and I have run them at full tilt some times with no issues and only 2 cables each.

[CephDigital]

57 minutes ago, wildgg said:

altho im not a fan of those splitter cables personally, you should be fine as you're also getting 75W from the pci slot.

I completely forgot about the extra 75W from the 16x connector...

 

Probably gonna undervolt it anyway, i want to try and make it near silent