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Crossfire 5770 or single 5870

Last response: in Graphics & Displays
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February 23, 2011 1:35:51 PM

Hey guys,

First post but have been reading the forums for a little while.

I recently rebuilt my rig and replaced my old 8800 gt sli with crossfire 5770 only to find out that my motherboard supports one x16 and the second card is x4 :( 

Would it be better to get a single 5870 or possibly a new motherboard that supports 2 x16 cards?

Thanks!
a c 235 U Graphics card
a b V Motherboard
February 23, 2011 1:41:23 PM

if you can return the 5770, then i would go with the 5870. otherwise, in x4 with a 5770 would be a hit...it would not be that major. the card is not that powerful


here is a test using x4 and the nvidia GTX480

The Bottom Line

The results are actually a bit shocking to us to be honest. We weren’t so surprised that in the previous evaluation x8/x8 did not cause any differences at 2560x1600 but did at 5760x1200. However, we thought certainly at x4/x4 PCIe 2.0 mode there would be some kind of a bottleneck at 2560x1600, but the results have proven otherwise. Even with all the data that GTX 480 SLI is pushing across the PCIe bus, x4/x4 is NOT a bottleneck in a single display setup at 2560x1600 with AA enabled. The only game to show us any difference was AvP, but it did not affect the gameplay experience. Therefore, if you are on an aging PCIe 1.X system at x8/x8 mode (equivalent to PCIe 2.0 x4/x4) on a single display fear not, you are not holding back the performance of GTX 480 SLI or we guess with any CrossFireX or SLI configuration.


http://www.hardocp.com/article/2010/08/25/gtx_480_sli_p...
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a b U Graphics card
February 23, 2011 1:45:09 PM

You shouldn't have a problem running the 5770's at 16x/4x. Here are two reviews showing how the 5870 and GTX480 are barely affected. The version of PCI-e does make a difference. What version of PCI-e is your motherboard?

http://www.techpowerup.com/reviews/AMD/HD_5870_PCI-Expr...
"...we will green-signal installing a third accelerator for some 3-way ATI CrossfireX action, or 2-way CrossfireX on entry-level Intel P55 motherboards with the second x16 slot electrically x4 (running in 1.0 mode)"

http://hardocp.com/article/2010/08/25/gtx_480_sli_pcie_...
"Even with all the data that GTX 480 SLI is pushing across the PCIe bus, x4/x4 is NOT a bottleneck in a single display setup at 2560x1600 with AA enabled."
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a c 125 U Graphics card
a b V Motherboard
February 23, 2011 2:04:17 PM

Personally I'd get the 5870.

However, depends because most of them are nearly $250, and at that price you can get a 560 Ti or a 6950.
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February 23, 2011 2:24:16 PM

Thanks guys. I would be returning these cards so I would have about $300 to spend on a new single card. I'm not very familiar with the 560 ti. What do you guys think is the best bang for your buck at that price range?
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a c 125 U Graphics card
a b V Motherboard
February 23, 2011 2:37:18 PM

I'd probably go with a 560 Ti.
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a b U Graphics card
February 23, 2011 3:01:40 PM

That motherboard has PCI-e 2.0 slots. You should have no problem running them at 16x/4x. If you'd rather get a single card, that's up to you. The GTX560 Ti is a great card for the money. Either the GTX560 Ti or the 5870 will cost you more than the 5770's though.
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a b U Graphics card
February 23, 2011 3:05:51 PM

Alright. I'll retract my accusation. I did not think to look at the times. I'm sorry to jump to that conclusion.
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February 23, 2011 3:15:52 PM

I actually had the 5770s running crossfire but the performance wasn't what I expected from those 2 cards. The rift beta played at roughly 30fps, which seemed kind of low to me.

to my understanding it is because the 2nd slot runs at 4x.

They are great cards but I have been reading other posts and it looks like my money would best be spent buying a single card that's better or comparible to running both 5770s, which I'm guessing would be the hd6950 or 560ti?

I apologize for the newbness of the questions. Its been a while since I've bought parts and just want to make sure I'm getting the best performance
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a c 235 U Graphics card
a b V Motherboard
February 23, 2011 3:18:06 PM

Dougx1317 said:
What the hell, man? You changed your reply to copy mine AND copied the link? Your original reply said that the 5770's would take a large performance hit at 16x/4x. You seriously changed it after seeing my reply? You even quoted the same thing as me. At least give me credit when you steal my ideas and links. That's just a real a**hole move on your part.



1. i never said it would take a large performance hit. my edit was to include the link...and its not your link.
im going to assume you are extremely stupid based on the response above. if you had an intelligence then you would see my edit was at "Message edited by ct1615 on 02-23-2011 at 10:45:18 AM"...that is Tom's server time, I can not edit or change that time.

you then posted your first reply at "02-23-2011 at 10:45:09 AM". so either you think I can change and post my reply in just nine seconds or that maybe I simply knew of that article before hand, remembered and linked it...it is posted on the internet after all. you simply made your reply at the exact same time as my edit.

based of all the information above, its fair to state the fact that you are a noob idiot.
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a c 235 U Graphics card
a b V Motherboard
February 23, 2011 3:32:06 PM

here is a generic GTX 560 vs 6950 1GB review. check to see which games you play more and how each card performs in them. personally I would go for the OC GTX 560 but you can't go wrong with either card.

http://www.guru3d.com/article/radeon-hd-6950-1gb-vs-gef...
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February 23, 2011 3:36:55 PM

I guess what I'm wondering is with either card will I see performance increases from the previous crossfire setup I had? If I really won't see a difference then I may as well keep the cards. Thanks a lot guys
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