Using seperate PSU for GPU, how do I boot both CPU and GPU at same time?

[LtRoyalShrimp]

Hi Guys,

 

My friend upgraded his GT520 to a GTX 760, on his pre-built OEM HP H8-1114 Desktop. 

 

He needed a new PSU, so get a CX750m from Corsair. Problem is, the computer wont boot when that PSU is used on the motherboard and CPU power connecters.

 

He now wants to connected the CPU and mobo to the old OEM PSU, and the GTX 760 to the CX750m. 

 

 

That can work, my question is, how does bootin work. Does he power on the main computer and then power the GPU using the pin trick, or does he leave the power on to the GPU and then power on the CPU? 

[Oshino Shinobu]

One of these things http://www.kustompcs.co.uk/acatalog/info_19006.html?gclid=CjwKEAiA7ZajBRCpur2xi47n1zkSJADqV2WlG-d0-UHECcoWuZB2t55sA8iU8s6DQwYw2SM0Ro8UgxoCQzbw_wcB

 

[Mixzzz]

Just make him remove the OEM PSU and just use the corsair one as there is no real purpose to use 2 PSUs in this case

[LtRoyalShrimp]

Just make him remove the OEM PSU and just use the corsair one as there is no real purpose to use 2 PSUs in this case

Ok, we tried that(Duh) but the motherboard wont boot. We nailed the issue down to the mobo and CPU power connectors. 

 

The Motherboard is a OEM  IPISB-CU (Carmel2) and has a 4 pin CPU power connecter. He tried using the CPU connector from the CX750m, but it didnt work. When he plugged in the OEM PSU to the CPU and mobo, everything worked again. 

 

OEM PSU -> Motherboard = Works

CX750m -> Motherboard = Does not work

 

OEM PSU ->Motherboard

CX750m -> GPU                is the new idea.

[strawberrymaker]

double post?

 

~Straw

[LtRoyalShrimp]

double post?

 

~Straw

On purpose. Not sure if better for GPU or PSU section. 

[LtRoyalShrimp]

Edit: Issue has been solved. CX750m needed some extra pressure applied to be in contact with the CPU power connector. False alarm.