So yesterday i installed a second 4890 in 16x 16x crossfire. Most games i have seen a noticable difference in frames. But in fallout 3, i have wierd FPS issues. In places where it wouldnt seem the graphic intensive, the frams drop all the way down to 30 fps, and in places like looking out over the land for far distances, it stays at a solid 60. Even more where is in most games when you looks straight down at the ground, your frames jump, but in fallout three i look straight at the ground and the frams drop. There is also some where lighting, like the HDR seems to be flickering. Does anyone else have issues with this card/game? could it be an issue with the crossfire scaling? thanks in advance!
I know its not a psu issue because every other game scales nicly. And after it was happening last night i decided to format my hard drive and start fresh. Installed 9.10 drivers and then installed fallout 3. Same thing is still hapenning.
EDIT: oh and also a couple times, when getting into a game, the graphics are all rainbow and wierd looking. it has happened a couple times, in a couple different games. could it be the second 4890 is faulty?
OK, whenever I'm having any problems with the machine, I start at the top, and work down to the details.
1. Is your machine stable? Can you run prime 95 for 12+ hours? This will test everything but the GPU.
2. I see a lot of people using FURmark to test GPU stability. Will your GPUs tolerate furmark?
3. If your machine is otherwise stable, have you tried different catalyst driver versions? I had trouble with 9.10 and went back to 9.9. For me they worked better, others have had no problems with 9.10.
4. Have you becnhmarked with a single graphics card, and then again with 2 cards to confirm that crossfire is indeed working? I had an issue where the crossfire checkbox was checked, but only a single card was in operation. I knew this by comparing a new 3dmark06 run, and compared the results I had previously for single and dual GPUs
Ok i just ran 3dmark06 at default settings, first with crossfire disabled, then with crossfire enabled:
Xfire disabled: 16203
Xfire Enable: 18280
The first time i tried to bench with xfire enabled, it gave me the wierd rainbow colords thing, and i hit print screen to show you guys. But when i went to paint and pasted it, it looked normal! 8-O wth is going on? lol
Ok so i just took out my first card i had(HIS 4890) and put the new card i bought(xfx 4890) in the main slot, and left the HIS out all together. Fall Out 3 is noticably smoother with almost no stutters... Will edit this and post 3dmark score in a few mins.
HIS by its self: 16208
XFX by its self: 15954
Im now gunna put the HIS where the XFX was before. (so taking your advice and trying them switched around)
Ok so i decided i am gunna return the second 4890 in a few days. The extra frames on games that already exceed 60+ frames on avg is not worth the 200 for me. PLus, some games i notice no difference or acutally get less fps. At least i tried though. I will use the extra cash and pick up a couple games. Mw2 is on my list. (ready to get flamed) Dont worry i signed the petition....
I usually upgrade the video card once a year.. i know a wast eof money but i like to stay on top. Im gunna keep this for a few more days, since i hava awhile to return it and test out some more games. If i end up returning it i will probably buy a 5850 or a 5870 in the coming months.