Do I have enough for SLI Graphics cards?

josherino · Jan 6, 2016

Hello, my friend offered me to use his extra GTX 760 in SLI with my own GTX 760. My specs are as shown
AMD 8320: OC to 4.0GHz
NVidia GTX 760 2GB
EVGA 600W Power Supply
MSI Gaming 970 Motherboard
8GB Ram
120GB SanDisk SSD
1TB HDD
CM Hyper 212 Evo

Will I have enough power for this? If not, would I be able to do it if I revert my CPU overclock?

Edit: His 760 Is 4GB

Jonas Dixon · Jan 6, 2016

On pcpartpicker your build withouth the overclock comes up to 585 watts, with the overclock that'll definetaly not work but even if you revert it you'd be pushing it. If i where you i'd give it a try but i wouldn't be surprised if it doesen't work at all or if it crashes sometimes.

rhysiam · Jan 6, 2016

It's not a great idea for a couple of reasons.

You're probably okay, just, power wise. A gaming workload could get the GPUs to 300-350W max, which is technically enough for the rest, but it's putting a lot of load on the PSU.

Add to that, I'm guessing this is your PSU? http://www.evga.com/Products/Product.aspx?pn=100-B1-0600-KR
It's okay, but not a top tier one, so not one you want to be running at high loads for long periods... PLUS, it only has 2 PCIe connectors I believe? You'd be resorting to adapters.

One you add your SLI scaling issues to the mix... I don't think it's worth it IMHO.

josherino · Jan 6, 2016

rhysiam :

Thank you for answering, that is not the correct power supply this is the correct one https://www.evga.com/Products/Specs/PSU.aspx?pn=FFEE59FD-9D7C-411C-A23D-C5A0A61DDE2D

If this makes any difference I would appreciate your answer.

ezskills · Jan 6, 2016

The first thing you need to know is you can't SLI a 2GB and a 4GB gpu with NVIDIA only AMD allows that so you won't be able to use SLI. With nvidia not only do the cards have to match but the Vram has to match too.

https://www.youtube.com/watch?v=cxc6cb3_y0w

josherino · Jan 6, 2016

ezskills :

I don't know any better, but that is a 2 year old video

ezskills · Jan 6, 2016

And NVIDIA Has not changed this rule just try it and when it don't work contact NVIDIA and let them tell you there rule that they never changed

rhysiam · Jan 6, 2016

ezskills :

Wow... good catch. I didn't actually know this. A bit of Googling reveals there's a heap of mis-information out there on this very issue. A whole bunch of threads with best-answers stating that it works fine (but only using 2GB - obviously). From what I've read it seems like Nvidia used to provide an unofficial and unsupported hack to get it to work through "coolbits"... sounds like you could force the system to recognise the 4GB card as just 2GB and then they would SLI. But that workaround is no longer available and it's now a complete no-go. It's a frustrating limitation.

Good catch.

SentinelFPS · Jan 6, 2016

If you're looking for more fps or an upgrade, I would recommend selling the card your friend has given you to invest in a single more powerful card such as the 980 or 980ti. In my opinion of course.

rhysiam · Jan 7, 2016

Thanks for the best answer, but I did de-select it... it was ezskills who got that info... best answer deserved.

RE Upgrading, I wouldn't go any higher than a GTX 970 or R9 390 personally (the latter would not be a good idea on your PSU either). That AMD CPU you have is fine for a mid-range gaming build, but it's going to hold back high end graphics cards in plenty of games, so don't waste your money on a premium GPU.

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