A little disclaimer: I've tried the latest CAP, 11.10, 11.11c, and 11.12 beta, to no avail.
Plainly put I'm getting negative crossfire scaling in every game I play except Deus Ex: HR (yay a game I never play!).
Some odd things about it:
I get great scaling in benchmarks, both furmark and "heaven DX11 unigine" see _very_ impressive numbers going into xfire. Skyrim is probably the worst, and was netting me a 15 FPS drop (latest 11.11c got it so I'm only losing like 2FPS). Now, as I said I've tried using these "CAP" things to no avail, and am really losing my patience with this. Other games tested include Witcher 2 and assassin's creed brootherhood, both saw negative scaling of about 5%. (although strangely enough, on cutscenes the witcher 2 saw nearly 85% positive scaling)
misc things:
GPUz says that my first GPU has xfire enabled ("enabled: 2 GPUs"), when I switch to the second one it says disabled.
I've verrified with the GPUz monitor that both cards are indeed doing things.
I've tried switching the card places.
Speccy insists that xfire is disabled, even when CCC says it's enabled.
One of the cards shows up as "antilles" and not cayman(meaning it can't be unlocked ot 6970). I had tried to flash it to no avail. Reason I include this is I was wondering if the failed flash to 6970 BIOS could effect this at all.
A friend suggested I run a memory bandwidth benchmark:
2.7 GB/s
I have the following mobo:
M4A79XTD EVO
I have verrified that the cards are both running in PCIe x8 2.0.
Plainly put I'm getting negative crossfire scaling in every game I play except Deus Ex: HR (yay a game I never play!).
Some odd things about it:
I get great scaling in benchmarks, both furmark and "heaven DX11 unigine" see _very_ impressive numbers going into xfire. Skyrim is probably the worst, and was netting me a 15 FPS drop (latest 11.11c got it so I'm only losing like 2FPS). Now, as I said I've tried using these "CAP" things to no avail, and am really losing my patience with this. Other games tested include Witcher 2 and assassin's creed brootherhood, both saw negative scaling of about 5%. (although strangely enough, on cutscenes the witcher 2 saw nearly 85% positive scaling)
misc things:
GPUz says that my first GPU has xfire enabled ("enabled: 2 GPUs"), when I switch to the second one it says disabled.
I've verrified with the GPUz monitor that both cards are indeed doing things.
I've tried switching the card places.
Speccy insists that xfire is disabled, even when CCC says it's enabled.
One of the cards shows up as "antilles" and not cayman(meaning it can't be unlocked ot 6970). I had tried to flash it to no avail. Reason I include this is I was wondering if the failed flash to 6970 BIOS could effect this at all.
A friend suggested I run a memory bandwidth benchmark:
2.7 GB/s
I have the following mobo:
M4A79XTD EVO
I have verrified that the cards are both running in PCIe x8 2.0.