Using seperate PSU for GPU, what is the boot proccess

[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 connectors.

 

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 booting 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? 

 

Does what im asking make sense? 

 

-Shrimp

[strawberrymaker]

he should add a switch between psu_on and com pin on the second gpu, or connect those two pin with the corresponding on the hp psu. and then simply connect the 6/8 pin pcie connector to the gpu. i dont know if the hp psu can power the 75 watts over the pcie connector from the motherboard

 

Pic for Pins: 

 

~Straw

[DildorTheDecent]

Or he could get one of those 24 pin cable splitters. They allow you to connect two PSUs together.

[LtRoyalShrimp]

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