• 6870 Crossfail - seriously can't figure this out :L
    4 replies, posted
So I had a reference 6870 with my Phenom 955 on my M3A770DE in my case with an XFX 750w Pro PSU, and just bought a second 6870, also by XFX. While each card seems to perform equally on BF3, enabling crossfire creates this sloppy 10-70 fluctuating mess (even on low) that is completely unplayable. The mobo has a 16x and a 4x PCIe combo, which might seem like a lead, but in-fact placing a 6870 in there by itself gets me the same FPS as in the 16x slot. Drivers are the latest, and PSU should be more than enough to run the two cards at the same time. I've tried other games but I either get the exact same performance as 1 card, or worse. I even removed the OC on my Phenom, bringing it back to 3.2 - still no difference. Any ideas? Once again the specs: - Phenom II 955 @ 3.2GHz - 3.8 OC w. Hyper 212 @ 20-35 deg - 2x 6870 (one stock AMD design, one is the short PCB XFX version with a bigger fan. - 4gb Kingston 1333 DDR3 ram - XFX 750W Non-modular PSU - ASRock M3A770DE mobo with 2 PCIe (16x + 4x) <= i believe that this is where the problem's at - 1080p monitor Not sure on what is wrong, but I'll provide results for anything you guys come up with..
Did you uninstall then install the latest drivers? Make sure the second slot is functioning at x4, some will do 16x1 by default x4 won't give a decent boost like 8x8 or 16x16 from my expirence with 16x4 I basically had a vRam boost. Performance was nominal
[QUOTE=JohnFisher89;35067698]Did you uninstall then install the latest drivers? Make sure the second slot is functioning at x4, some will do 16x1 by default x4 won't give a decent boost like 8x8 or 16x16 from my expirence with 16x4 I basically had a vRam boost. Performance was nominal[/QUOTE] Yes, fresh driver install, second slot is functioning at 4x in crossfire. I did hear other things from experts, as well as benchmark results that 4x crossfire only loses about 5% vs 16x16x, but i'll look more into it. Not sure if it's relevant but the mobo has an AMD770 chipset, not sure if it supports 6870CF or not..
the website for the mobo does, try checking the chipset drivers for any updates [url]http://www.asrock.com/mb/download.asp?Model=M3A770DE&o=All[/url] [editline]9th March 2012[/editline] also make sure in power options it is set to "High Performance" and not balanced
Couldn't find the chipset driver on the website or in the All-in-one, but I did set the power setting, guess what battlefield 3 decided to throw at me? [img]http://i.imgur.com/R5lT1.png[/img] Interesting, considering both cards can run the game by themselves without a single error.. [editline]9th March 2012[/editline] Yeah it's pretty much doing either that, or just straight up quit without any error warning :L [editline]9th March 2012[/editline] just launched singleplayer and after 10 minutes of me skillfully spamming Ctrl+Alt+Del, and the little fucker having it's way raping my system running itself at 0.1fps like a scumbag, BSOD < first one i've had in 9 months
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