Crossfire question

[Austin Warchol]

Hello all! I'm considering crossfiring my current MSI R9 270x 2G with another one soon, I've looked around and I should have the wattage required, I'm, using an EVGA Supernova NEX750B for power. I have looked and found that I need around 50 amps on my 12V rail, and I have 61 amps available. my only issue is that my PSU only supports 3 6+2 VGA cables. Here's where I started digging. http://www.evga.com/support/manuals/files/110-B1-0750.pdf This is where I found that I may be able to use my CPU2 plug for the 4th 6+2 power lead. The CPU2 rail has 20 amps by itself and is the only plug on 12V3 (rail 3 of 12v I'm assuming) so it ought to be doable. Now I need to either adapt my own CPU2 cable to a 6+2 male end or find another suitable cable that will plug into CPU2 and terminate in a 6+2 VGA.

 

Don't tell me to get a better single card please. I know it might be a better performer but this is my goal.

 

Thanks in advance for your help!

 

Specs:

EVGA supernova NEX 750B Semi modular

Corsair Obsidian 350D

Asus Z97M-Plus

Intel 4690K, not overclocked yet

Using a stock cooler right now, planning on an H110 then some OCing

Kingston HyperX 8GB 2X4 1866

MSI R9 270x 2GB (planning on a second)

Segate 1TB HDD 7200RPM

Kingston SSDNow v300 250GB 

Also planning to add 2 front AF140 fans later. 

So total potential fans are 1 120mm and 4 140mm

 

 

[Wingfan]

Why cant you use a molex adapter?

[MourningSouls]

From what I understand based on something I read by OklahomaWolf (The main reviewer on JonnyGuru) is that while the headers are identical, the wiring is different enough that it could be damaging. (Using an EPS cable as a PCI-E)

Though not ideal, you could use a (generally dual) molex to PCI-E adapter. Or, I would honestly recommend selling your current 270X and buying a 290 or 290X instead. It'll cost a little more yeah, but it should beat the Crossfire option by a bit, while also not having the problems many have with Crossfire (And SLI).

[Austin Warchol]

I'm aware of the molex adapters but having limited cable management room as is I don't want to go that route. 

 

From what I understand based on something I read by OklahomaWolf (The main reviewer on JonnyGuru) is that while the headers are identical, the wiring is different enough that it could be damaging. (Using an EPS cable as a PCI-E)

Though not ideal, you could use a (generally dual) molex to PCI-E adapter. Or, I would honestly recommend selling your current 270X and buying a 290 or 290X instead. It'll cost a little more yeah, but it should beat the Crossfire option by a bit, while also not having the problems many have with Crossfire (And SLI).

 

Thank you for this information! This was exactly what I was looking for. The tinkering side of me always wants to upgrade by rig but since my 270x is fine at 1080p I think I'll just run with it for now and put the money toward an H110 and some fans, maybe LED's too.

 

Thank you again!