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[Official] AMD Radeon HD 6850/6870 Owners Thread - Page 508

post #5071 of 6939
I have moved my psu to the top of my case to make room for my tv card this also cleared room at the bottom of my case for more airflow to my cards.This required rewiring the whole pc so now my cards are top to bottom 9600gso,6850,6850. Installed drivers nvidia 285.62 ,physx mod 1.05ff, amd 12.2(although afterburner says 12.3) raised pci-e voltage in my bios and reinstalled afterburner.I don't know what helped so I tried to mention everything I did but now my cards are stable at 1000/1100 from 970/1100.
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post #5072 of 6939
Quote:
Originally Posted by smoke420 View Post

I have moved my psu to the top of my case to make room for my tv card this also cleared room at the bottom of my case for more airflow to my cards.This required rewiring the whole pc so now my cards are top to bottom 9600gso,6850,6850. Installed drivers nvidia 285.62 ,physx mod 1.05ff, amd 12.2(although afterburner says 12.3) raised pci-e voltage in my bios and reinstalled afterburner.I don't know what helped so I tried to mention everything I did but now my cards are stable at 1000/1100 from 970/1100.

Sounds interesting.
Maybe it's the pci-e volt? thinking.gif
How about your cf pci-e bandwidth? Did you have a 32x (16x/16x) before and got an 8x/8x now (for the 6850's)?

PS: I've recently set the oc freq. for my two 6870's not anymore synchronized with the afterburner, 980/1200 for the top Hawk and 1000/1140 for the bottom one. It seems it works pretty good with Batman AC so far. Is there any particular reason why we shouldn't run our cards at different speeds?
Edited by arrow0309 - 3/19/12 at 12:55am
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Arrow I7
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post #5073 of 6939
Quote:
Originally Posted by arrow0309 View Post

Sounds interesting.
Maybe it's the pci-e volt? thinking.gif
How about your cf pci-e bandwidth? Did you have a 32x (16x/16x) before and got an 8x/8x now (for the 6850's)?
PS: I've recently set the oc freq. for my two 6870's not anymore synchronized with the afterburner, 980/1200 for the top Hawk and 1000/1140 for the bottom one. It seems it works pretty good with Batman AC so far. Is there any particular reason why we shouldn't run our cards at different speeds?

Not particularly.. My cards run better when they aren't synced.. (Even with both at the same settings).

So my 6850's have different bios'? According to GPU-Z.. They're the same card, identical as far as i can see.. Unless one has a slightly different PCB? I dunno, would flashing the later one do any harm/good? thumb.gif
 
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post #5074 of 6939
Running at different speeds increases the chance of microstuttering since the faster card will be waiting on the slower one.
post #5075 of 6939
Quote:
Originally Posted by bmgjet View Post

Running at different speeds increases the chance of microstuttering since the faster card will be waiting on the slower one.

You think that.. But seriously.
6870 @ 970Mhz and 6850 at 900 was fine to me. No microsuttering here.
I'm running 2x 6850's now for ascetics however
 
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post #5076 of 6939
Quote:
Originally Posted by Matt-Matt View Post

Quote:
Originally Posted by bmgjet View Post

Running at different speeds increases the chance of microstuttering since the faster card will be waiting on the slower one.

You think that.. But seriously.
6870 @ 970Mhz and 6850 at 900 was fine to me. No microsuttering here.
I'm running 2x 6850's now for ascetics however

Come on guys, if there's to be any micro-stuttering (happening only in v-sync on mode) it simply appears with some games in the 2-way CFX only. I experienced it sometimes in Skyrim (inside the dungeons) with the cards running at the very same speeds. It only disappears completely in a 6870 3-way crossfire (with one 6870x2+6870) but its a waste due to the cost,temp&power/performance ratio. rolleyes.gif

Right now I'm playing BAC in dx11 maxed (v-sync off) and I don't see any microstuttering. What I see sometimes is a fps drop, but it's quite playable. At these freq. above, the max. stable oc for my cards right now, I got some 70-71°C max for the gpu1 (definitely hotter for its position and cooler) and 49°C for the bottom 6870 (at 1000/1140). thumb.gif
Edited by arrow0309 - 3/19/12 at 4:15am
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Arrow I7
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post #5077 of 6939
Quote:
Originally Posted by arrow0309 View Post

Come on guys, if there's to be any micro-stuttering (happening only in v-sync on mode) it simply appears with some games in the 2-way CFX only. I experienced it sometimes in Skyrim (inside the dungeons) with the cards running at the very same speeds. It only disappears completely in a 6870 3-way crossfire (with one 6870x2+6870) but its a waste due to the cost,temp&power/performance ratio. rolleyes.gif
Right now I'm playing BAC in dx11 maxed (v-sync off) and I don't see any microstuttering. What I see sometimes is a fps drop, but it's quite playable. At these freq. above, the max. stable oc for my cards right now, I got some 70-71°C max for the gpu1 (definitely hotter for its position and cooler) and 49°C for the bottom 6870 (at 1000/1140). thumb.gif

Holy crap, that's some difference in temps! redface.gif

I don't see how people are getting such better temps then me though.. These cards are meant to be amazing at cooling.. But they just aren't..
 
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post #5078 of 6939
Quote:
Originally Posted by Matt-Matt View Post


Holy crap, that's some difference in temps! redface.gif

I don't see how people are getting such better temps then me though.. These cards are meant to be amazing at cooling.. But they just aren't..

That's because of my gpu1 (Hawk) position (lacking of the third free slot between) and cooler (compared to the the 3 fan bottom beast) biggrin.gif

450
Arrow I7
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Arrow I7
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post #5079 of 6939
Quote:
Originally Posted by arrow0309 View Post

Sounds interesting.
Maybe it's the pci-e volt? thinking.gif
How about your cf pci-e bandwidth? Did you have a 32x (16x/16x) before and got an 8x/8x now (for the 6850's)?
PS: I've recently set the oc freq. for my two 6870's not anymore synchronized with the afterburner, 980/1200 for the top Hawk and 1000/1140 for the bottom one. It seems it works pretty good with Batman AC so far. Is there any particular reason why we shouldn't run our cards at different speeds?

Yes I did go from 16x/16x to 8x/8x but that doesn't hurt performance at all.I used to run both 6850's ,my gtx 260 for physx, and my 8500gt as a tv card and got very similar benchmark scores a little lower than just the two 6850's at 16x/16x (My board does 4 pci-e slots at 8x).But after raising the pci-e voltage the scores were exactly the same so I can tell you for sure (because ive tested it) a 6850 overclocked or not can't saturate the x8 bandwidth.The only reason I raised the voltage was adding another card but Im starting to think it also helped my overclock.

The only thing ive noticed running the cards at different speeds is the card with the higher clocks usually has lower load and because of this I think you get even performance.I personally never tried but do you get higher scores with say 980/1200 and 1000/1200 vs 980/1200and 980/1200?Id figure that because the card with the higher clocks doesn't load as high its the same as running them both at the same speed but im guessing here.

I stopped running the cards at different speeds a while ago because afterburner won't let me anymore.lets say I set profile #1 on card #1 to 970/1100 if I set profile #1 on card #2 to 1000/1100 then profile #1 on card #1 will revert back to stock 790/1000..
Im not worrying about it anymore because now both cards can do 1000/1100 rock solid and stay cool.Im a happy man no more afterburner voltage mod no unofficial overclocking and ulps is still on I may try to push the vram a little but other than that im good.
Edited by smoke420 - 3/19/12 at 8:16am
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my rig
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Hard DriveCoolingCoolingOS
Western Digital 1tb 7200rpm Corsair H50 Push/Pull (external rad) Ultra U12-40659 Carbon X4 shin-etsu thermal com... windows 7 ult,Ubuntu,xp mc edition 
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post #5080 of 6939
Quote:
Originally Posted by Matt-Matt View Post

Not particularly.. My cards run better when they aren't synced.. (Even with both at the same settings).
So my 6850's have different bios'? According to GPU-Z.. They're the same card, identical as far as i can see.. Unless one has a slightly different PCB? I dunno, would flashing the later one do any harm/good? thumb.gif

You shouldnt do that, they might have different memory chips and doing that will brick one of the cards.
I already made the mistake of doing that and this was what happened, you can still save it tho. Just reflash to the stock bios
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