How many users have SLI/Crossfire?

[RickRuski]

I still have micro stutters now, I thought I had got rid of nearly all of it but the last two patches have returned the problem.

The promised Sli support from Nvidia (luthier has stated that Nvidia have the information but now need to produce a profile for it) may cure what is left.

The micro stutters aren't noticeable when dog fighting at altitued, only when chasing fleeing enemy down low.

I have limited the amount of stutters I'm getting by limiting fps through EVGA Precision Tool without any loss of performance.
Normally I can get fps in London Attack Single Mission of 45--80fps without frame limiting, over water 80---110fps.

I've limited fps to 35fps and have smoother game play and very little stutters even down low, but I've had to experiment with a lot of settings to achieve that.

C.o.D. is the only modern sim that I play that has this problem (certainly not with R.o.F.)
Sli/Xfire support has been promised for so long now it is very frustrating for all of us who have built dual card systems, let's hope that the next Nvidia driver release comes to the party.

Luthier said that they had also been in touch with AMD/Radeon about support for their product but at that stage they hadn't had a reply.

[FS~Phat]

Luthier has already posted the Nvidia profile that will eventually become part of the official drivers. It works very well in SLI now even in 4way SLI.

If your not capable of manually creating a profile using the info Luthier provided then just wait for Nvidia to add it to a driver soon.

It does work very well now, the only limiting factor is the rendering thread on the CPU has now completely maxed on my system which means the GPU usage sits around 50% for each GPU over complex terrain but they do all go up to 80% on occasion when the scene is less complex.

So bottom line it works exactly as intended, the limiting factor to performance increases pretty much comes down to how fast your CPU is. My CPU is OC to 5Ghz which explains why I get more of a performance increase than others.

To be honest I think there is currently only enough CPU horsepower with todays CPUs to drive a 2 way SLI system to 80% usage or higher regularly on CLOD.
So anything more than 2 cards is pretty much wasted on CLOD because of its high CPU Ghz dependence.

[Stublerone]

And also 2 cards below 1.5 gb vram Just ran clod again on highest settings with single gpu at about 50 fps average, but saw a vram reduction to my last (but very old) tests. It uses up to 1.8gb vram at normal 1080p.

So, a card like Ricks 450 with 1gb woill definetly have troubles. 1gb is too less, even 1.5 of the standard 680.

Note, that some of the biggest stutters occur with the streaming. I did with my i7 920 @ 4 ghz and ssd. Some stutters are simply not avoidable on some system configs. So, I will need to think about a better cpu to reduce it, although my cpu is running sufficiently for clod. I am not at its performance bottleneck...

So, rick, if you want to get rid of vram stutters, u will have to tweak texture load down to 1gb vram usage. That.means reducing texture quality