Help to install Modular PSU!

[Black Panther]

I installed an HX850W (it's a modular corsair and will work with my 5970).
I've installed like 6 or 7 PSU's before with no problem but this is my first modular one.

I just can't find the piece which should fit here...

In case the image is not clear, it's:

-square-roundbottom
-roundbottom- square

Btw it's a P5B mobo.

I'm sure this is the crux of the problem. I know and can identify the old psu cable which went into there, but I can't for the heck of me find the equivalent cable from this new PSU.

Without it I get the led of the mobo light up but when I press the power button nothing happens. Not even the fans start to spin. I'm pretty sure it's the part which powers up the cpu that's why.

Any help?

 

[driver66]

that looks like the 4 pin to help power the CPU

 

[Goodman]

that looks like the 4 pin to help power the cpu

I think she knows that...


Can you get a pic of your wires end of the power supply?

 

[Black Panther]

that looks like the 4 pin to help power the CPU

http://img.techpowerup.org/100204/Capture002.jpg

Yes I'm pretty sure it is. Anyway without it my pc won't even turn on the fans when I press the power button. Thing is that I'm not seeing any cable which can fit...

My psu is a Corsair HX850W. I'll try to find a link to it...

 

[Athlon2K15]

most likely the modular psu has an 8 pin cpu that can split into halves to make dual 4 pins

 

[Homeless]

It will be your 8 pin connector which is really 2 4 pins put together

 

[stevorob]

My corsair 750 (not modular) only has an 8 pin that doesn't split, but you should be able to get half fit that 4 pin connector since that is what I have on my board.

 

[Goodman]

most likely the modular psu has an 8 pin cpu that can split into halves to make dual 4 pins

+1
I didn't think of that , that must be it

 

[stevorob]

http://www.jonnyguru.com/modules/NDReviews/images/CorsairHX850/DSCF1067.jpg

There should be the 24 pin, 2x 6+2 pci-e and the 4+4 8 pin

 

[Black Panther]

and the 4+4 8 pin[/QUOTE] and wo... put the wrong 8 pin in the graphics card....

 

[stevorob]

Gfx uses the 6+2 pci-e connectors

I've attached a pic

Circled in red is the 4+4 8pin
Circled in blue are the 6+2 pci-e connectors for your gfx

 

[Black Panther]

My gfx takes one 8 pin and one 6 pin, I'm now thinking that I might have put the wrong 8 pin in the graphics card....

That had been it!
The one with the thick cable should have been the 8 pin I 'split' to go into the 4 pin powering the cpu, and not inside the 8 pin of the 5970....

PROBLEM SOLVED

HX850W and 5970 running fine and working on my rig, and well, I made it!

 

[MKmods]

good thing it didnt start, the 8 pin power and ground wires for the GPU is reversed from the 8 pin for the CPU

 

[Delta6326]

and would that be the one in the thick cable?

My gfx takes one 8 pin and one 6 pin, I'm now thinking that I might have put the wrong 8 pin in the graphics card....

yes you probable used the wrong one on every psu i have had the 4pin/ 8 pin is the none modular cable eith the group like this http://img.techpowerup.org/100204/Capture0045.jpg

http://img.techpowerup.org/100204/Capture0046.jpg
http://img.techpowerup.org/100204/Capture0048.jpg hope these help out

EDIT: glad it worked i was in the middle of writing this when you posted

 

[Loosenut]

Your motherboard is an ATX12V(4 pin) board and your PSU is an EPS12v(8 pin). Most EPS12v psu's are backwards compatible but not all.

http://www.corsair.com/products/hx850/default.aspx

 

[Indra EMC]

My corsair 750 (not modular) only has an 8 pin that doesn't split, but you should be able to get half fit that 4 pin connector since that is what I have on my board.

There's must be 4 pin EPSv CPU connector in your Corsair TX 750

because i have that PSU too...

if wasn't ? you can buy converter from 8-pin to 4 pin, the price is only couple of bucks.