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HELP help first time crossfire

muggs

muggs

muggs

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Joined
25 Jun 2007
Posts
2,098
ok so ive just crossfired my 6950's, both flashed to 6970's. on their own they run great but together i get lag however heaven has improved but i think it should be more. could the problem be the fact that both pci-e lanes are running at 8x?

i have a corsair 620w. here are the heaven benchmarks

anything in ccc i should check?

single
single.jpg



crossfire
crossfire.jpg
 
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dude i dont have a clue. i only installed the 10.12a hotfix drivers. wait let me get the full name

here: amd_win7_vista_radeon_hd6900_8.79.6.2rc3_dec16 im sure these are the 10.12a hotfix
 
The only results I can find for my CF setup with Heaven V2.1 is as follows

FPS: 93.6
Scores: 2358
Min FPS: 55.6
Max FPS: 246.0

Drivers 8.790.6.2000 (10.12a)
Done on the 17th of Dec.

6950 is apparently recommended to need atleast 600W, even if drivers help a new PSU would be a good idea as you don't want to fry components due to over stressing the PSU.
 
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MichaelM said:
The only results I can find for my CF setup with Heaven V2.1 is as follows

FPS: 93.6
Scores: 2358
Min FPS: 55.6
Max FPS: 246.0

Drivers 8.790.6.2000 (10.11 modified for 6900 Series, not 10.12a)
Done on the 17th of Dec.

6950 is apparently recommended to need atleast 600W, even if drivers help a new PSU would be a good idea as you don't want to fry components due to over stressing the PSU.
Click to expand...

fry components as in components that are not in the psu?
 
muggs said:
fry components as in components that are not in the psu?
Click to expand...
Yep, not done it myself but have seen posts about it and some pictures. Motherboard mainly but whatever is attached can also get damaged.


Just checked and the drivers I quoted for my test are the 10.12a drivers.
 
lol i install these latest drivers from amd site and they install but do nothing. they dont even ask me for a restart after the successful message. theyu were 112mb, i havent just downloaded the ccc and not the drivers have i because device manager still shows standard vga yellow exclamation mark

ok im going to look for some 10.12a's


right all i can find for 10.12a are the ones i already installed and ran the benchmarks on. can some one link me to 10.12a that dont have this name: amd_win7_vista_radeon_hd6900_8.79.6.2rc3_dec16
 
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I suggest waiting for newer mature drivers. These cards are new so the drivers are rather poor at the moment.

Should be unlikely but I have a feeling your CPU could be bottlenecking... hence the lag. Looking at the benchmark results everything looks fine. Where does it lag?
 
well i,ve been test my out and was getting about the same as u. same 12.a drivers . was lucking at system stuff and found my mem was only showing 3gig. went to bios and enabled remapping of pci mem, that give me the 4gig . also in heaven 2.1 before bmark turned off sound what helped. damn usb headset taking mem up. fps went up to 88.4 now that was on asus 6850 shader unlock bios at stock clocks. got 91 when oced to 845/1345 with 15% power. whats not much more really. so i'm thinking been on 8x plus mem/cpu speeds are holding them back a little.

9550 chip @ 3.75 bus speed 440 rated fsb 1760 timings 5.5.5.15
 
hey guys check it out

Capture.jpg


i had a fresh cop of win7 64 on a hd(previous benchies were on vista 64) that i thought i would try. one card is @ 940/1440 other card is 885/1390.

orcvader it did not lag in heaven it lagged in just cause 2.

ive still seen higher benchies but the ppl never mention their clocks.

so what do you think? does it look right. just donloading jc2 now to check if it still lags
 
Stick with stock frequencies if you are trying to troubleshoot if your setup is running correctly.

The results I posted are on stock frequencies and driver settings.
Heaven is heavily based on GPU performance so comparisons with other setups should be pretty close, not 20fps off. My CPU @ 3.2ghz made no markable difference compared to it running @ 3.6ghz.


Removing one card and checking single card performance of each would tell you if one card is dodgy or if they are not receiving enough power.
 
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20fps off, i dont understand? are you comparing my latest bench with the bench you posted? if so i cant see where im 20fps off or am i missing something?
 
oh yes of course you mention stock clocks. i know one card gets normal scores on heaven but cant remember if i tested the other, i do know the one i think i didnt test is the one that clocks really well. i will test it after jc2 has downloaded
 
ok here are the single benches, by the way jc2 runs better now on crossfire but still its not working right because its better on a single card.

benches are at stock 6970 clocks(well one card is running the 890core asus bios other at 880 standard 6970 bios)

880
Capture-2.jpg


890
Capture-1.jpg


so both cards seem fine and the 880 card runs jc2 better on its own, will check the other on its own with jc2 now.

ok jc2 benchmark more or less identical with the other card so it seems both cards are fine, just turn crap when in crossfire. so i doubt its my processor, and the 8 lanes, well dont think its that. could it really be a power issue?

Or maybe p45 chipset sucks at crossfire
 
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I can't find any reviews with a single 6970 at 1080 res and default settings for heaven v2.1 anywhere. Easiest solution is to match this reviews heaven settings and see how your single 6970 setup compared to it.
Don't forget to loop the Heaven benchmark once before running the test to make sure its fully loaded and avoid loading lag dropping the min and average FPS results.

If you are near those results then the cards are fine and its worth switching to the default bios on the card and trying to compare crossfire results of 6950's.
If the 6950's are working as expected in crossfire then flashing to 6970's could very well be starved for power, its most likely under the recommend minimum PSU spec as I have already stated so really wouldn't be a big surprise if that is the issue.
 
yes i always let heaven loop, i run the benchmark three times and get the last result. well have to mess with it tomorrow.

one final thing, martynpd what drivers are you using as i notice they are different to mine, are they the ones that came with the card on cd?
 
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