» Fri Jul 13, 2012 7:41 pm
Hmmm... I just borrowed my friends 6990 to see if I want to upgrade to it, and a lot of games tripled their framerate from 45fps (crysis 2 and the witcher 2), to about 90-100fps @ 2560x1440 (edited after I read my own post, these framerates are only doubled, but some other games are trippled). I then ran oblivion @ crossfire renamed exe, and it gave me a 2-4% improvment (47 fps instead of 45, with ssao + godrays + liquid water only enabled) , each gpu using 60-80%. I then switched to my concurrent vanilla install, and still got 80-100fps. Which is the usual fps for my 5870. At best i gained a few stray frames.
Seriously unimpressive crossfire support right there. And that's regardless of memory onboard the card, the 6990 has 4gb (2gb effective), and I interestingly get the SAME fps hits when I install 4k lod textures and then RAEVWD (it uses at 1.2gb video memory usage via ati tray tools monitor, which should mean that it runs better on the 6990 vs the 1gb 5870, not so) . Obge has the same fps hits when i activate it. And it levels at exactly the same fps as my older, slower 5870 got. And this is on a 25 mod install. Without all the (apparently) cpu taxing mods such at better cities, fcom, and unique landscapes.
WIth them installed, I then get exactly the same fps hits (or at least, very close) as the 1gb 5870 with each inclusion.
Conclusion? = Well... video memory/crossfire/better card seems to play less of a role than i thought it would, I knew that oblivion had an invisible barrier linked to more mods, but I just assumed it either taxed the cpu, the memory, the hard drive, or the gpu, or gpu memory. Right now I have raided 60gb ssd's, 5ghz clock cpu, 8gb of memory, and a 6990. And it still maintains the same barrier. Of note, underclocking my cpu back to core clocks (2.8ghz), lowers the framerate by 8fps on my 100mod install, and by 20ish fps on my 15mod install.
This post is targeted at anyone purchasing a 6990 or gtx 590 with a large reason being a modded oblivion install. I am still going to get one of these cards once I can afford it, because I like games in general.
One thing worth mentioning, is that oblivion does however run completely stutter free on SSD hard drives and a fast cpu with oblivion stutter remover. Just the actual framerate barely improves with far greater cards.
I tried this with three revisions of the drivers, and confirmed that crossfire was in effect, maybe not being used correctly, but in effect regardless.