Nvidia cards of 560 series not compatibile in Sli

[RickRuski]

I agree with Mr Greezy, that the micro stutters we are getting aren't happening in other games that have been optimised. Call of Duty 4, for e.g. which is DX9 runs smoothly with Sli. I thought it might have been related to DX but unless it only affects DX10 then that isn't the problem. I also have no problems with ROF (DX10) after the last patch which has with the help of Nvidia runs smoothly with no break up of graphics. All the earlier Il2 series have no problems either (Ok Il2 is OGL ) so the problem points to optimisation of COD. Some of us have Sli running OK but not perfect, lets be patient and give the team our support with positive vibes and let them get on with it.

[Blackdog_kt]

Guys please read my previous post again, as you seem to be reading into it more than it states. I didn't say "sit tight and do nothing devs, these guys were asking for it for buying dual GPUs", far from it. That's a totally different interpretation and it's not mine.

So, to recap, i'm not saying CoD is beyond optimizing or that everything is perfect, i'm just saying it has been said for ages that dual-GPU setups have an inherent hardware disadvantage by design that causes stutters in some games and now someone took the time to measure it accurately, confirm it via AMD/nVidia representatives and present it for the rest of us. Actually, if the article is accurate then it causes stutters in most games, but the "gap" is not always perceptible by the human eye and so it doesn't bother us most of the time.

In that sense yes, seriously, there's a hardware design issue in dual GPU setups overall (and in some single GPU setups too), which shows even more in CoD due to certain engine restrictions and bugs.

[Mr Greezy]

Sorry my man. Didn't mean to sound heated. I'm just speaking as a non-ultra technical PC user. As far as I'm concerned, everything else works great except CLoD. So I'm a fan of SLI.

[ATAG_Snapper]

It was a good article to read because it shows what the game devs have to deal with when working with Nvidia/AMD to get SLI/Xfire working well. Nuthin' ever comes easy, it seems!

[Ataros]

Originally Posted by r0bc

People with the fastest GPU's on the market get shudder in this game and it happens with one card.

Not true. Single GPU runs it smooth if you reduce settings to match your card performance (texture quality and lighting/shading mostly). I can confirm this for 2GB single GPUs at least.

[r0bc]

Originally Posted by Ataros

Not true. Single GPU runs it smooth if you reduce settings to match your card performance (texture quality and lighting/shading mostly). I can confirm this for 2GB single GPUs at least.

I tested a EVGA GTX 580 3GB last night and even bumped my overclock to 4.6 and it shuttered in the same places I normally see it.