Can I run two 7750s in crossfire at pcie 2.0 x16 x4?

Supahpow31 · Mar 28, 2013

I have an HP DC7900 CMT and it has two pcie 2.0 x16 slots. But, one is electrically a x4 slot. Would that have a big impact on performance? Or would it just be better to just use one 7750?

And right now I am rockin a Galaxy gt 430 so I know what slow is. And the 7750s would be a huge improvement.

Also would the fact that one slot is a x4 not supply enough power for the card?

SinisterSalad · Mar 28, 2013

There are no Crossfire bridge connectors on the 7750, so Crossfire is not an option. You will need to step up to the 7770 to have that ability.

Supahpow31 · Mar 28, 2013

Oh, ok. I am new to the whole idea of sli and crossfire. I wasn't aware that all cards didn't support it. The only reason I want to upgrade from my gt 430 that has served me for about three months is because I recently became addicted to skyrim and it will only play it at medium settings. Avg 30-45 fps ish

But I guess I will hold off on the upgrade. XD looks like I will be holding on to my $50 powerhouse that for some reason can play every game decently. But not on very high settings

vehlor · Mar 28, 2013

2 x HD7750 will cost around $200. with that money you can buy a good card. If your PSU is weak you can get a decent $40 psu and a HD7790 or GTX 650 Ti Boost.

mclovits · Apr 9, 2013

If you really want to go that route, it's more than possible, there is not bridge required for 7750 Crossfire: http://sites.amd.com/PublishingImages/Public/Graphic_Illustrations/WebBannerJPEG/AMD_CrossfireX_Chart_1618W.jpg

I would try getting a single GPU if you can, like a 7870, you'll get similar performance with less power consumption, less heat, and an extra GB of VRAM.

urbanmidnight · Aug 22, 2013

Hi guys ! I have a HD7770 OC special with 2gb of ram.
I am in the same conundrum as the poster, my motherboard is a Asus M5A97 EVO REV 2.0 with two PCI-E slots for crosfire. My manual lists the blue slot as x16 but the black slot says 1 x PCIe 2.0 x16 (x4 mode, black). Does this mean my second slot in crossfire will run at 4x mode ? And if so will it make it pointless me buying another card of the same spec ? I was gonna order a second card today but really need to understand if I'll see a good enough boost performance wise. I've seen posters say the 4x will slow it down, but if so what's the point of putting the slot on the board ? Surely you'll see a big boost logically ? Why put a slow slot on the board ?

Thank you !

mclovits · Aug 22, 2013

urbanmidnight :

Well, seeing as my correct answer wasn't selected, I suppose this thread isn't really good for answering the original question, so I'd be happy to help you out, though, make sure to make a new thread in the future.

Well, as I always say, a single GPU solution is the way to go, especially with more demanding games coming out, a 128 bit memory BUS is soon not going to be near enough. BUT, if you don't want to sell your current card, and you do want to try a crossfire configuration, you could. Until you reach high performance GPUs, the PCI slot Generation and Bandwidth really doesn't matter, with two 7770's I doubt you'd see any major performance hit from using a x4 PCIe slot, though both slots will be throttled to x4 mode. You'd definitely get more performance from 2 cards than a single card in most games.

Some motherboard manufacturers include these extra slots for other types of PCIe based cards, dedicated physx cards are quite common too.

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Can I run two 7750s in crossfire at pcie 2.0 x16 x4?

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