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Overclocking crossfired 6870's - Page 2

post #11 of 17
6/14/12 at 12:54pm
Thread Starter 
Quote:
Originally Posted by superj1977 View Post

But did you have 2 6870' before wink.gif
Im thinking perhaps theres too much load ?its possible.
Any chance you can get that BSOD code, it may help point to an answer....maybe its not you PSU but a code may give indication.
good point tongue.gif and well i figured out the ab problem and can now adjust voltage here's the weird thing i just figured out, my original 6870 came with a 920 cc and 1120 mc and default voltage of 1231 this second one is showing stock cc of 900 and a stock mc of 1050 and default voltage of 1175, when attempting to change the second cards voltage to match at 1231 the screen spazzes out so obviously that wasnt meant to be, here's the question now, what do i do to overclock them theyre the same card same brand and everything why are they different and what should i do to overclock them ?
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post #12 of 17
6/15/12 at 3:47am
I did experience the same with 2xHD5870 i had on water, i ended up flashing the second card with a copy of the first cards bios, there was no issue doing so as they where both the same card, reference models and there where no differences apart from the second cards clocks and voltages.

Once i flashed my second card i could control clocks and voltage on both cards but if i remember rightly i had to set same voltage for both cards which was a shame as the second card didnt really need the volts i had to give it.

Bios flashing is not easy if you have no experience doing so and it gets real tricky when your not flashing ref models as well.
If you went down that route id spend a few days reading up and taking advice on the whole process as you can end up with no video signals on your GPU if the flash goes wrong, you would then end up doing a "Blind flash" which is so difficult but can be avoided by having a spare card to pop in slot 1 if you "brick" a card with bad flash.

Always make backups of original bios first, just in case it goes wrong or you wish to sell them on and return them to stock bios, its literally a 2-3 second fool-proof process using GPU-Z thumb.gif

Also ask yourself....is it worth overclocking them? CF6870 is not to be sniffed at, some decent GPU power there even at stock clocks
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post #13 of 17
6/15/12 at 4:03am
Quote:
Originally Posted by HelenKeller View Post

good point tongue.gif and well i figured out the ab problem and can now adjust voltage here's the weird thing i just figured out, my original 6870 came with a 920 cc and 1120 mc and default voltage of 1231 this second one is showing stock cc of 900 and a stock mc of 1050 and default voltage of 1175, when attempting to change the second cards voltage to match at 1231 the screen spazzes out so obviously that wasnt meant to be, here's the question now, what do i do to overclock them theyre the same card same brand and everything why are they different and what should i do to overclock them ?

Your cards are binned differently . thats why their stock voltages are different. I suggest you keep both your HD 6870s at 900 Mhz. I think your PSU is not a high quality one. It has 70% efficiency. maybe just enough. don't risk your PSU and your cards by overclocking. you could do some serious damage to both the PSU and graphics cards.
Also in a crossfire setup keeping both cards cool is not so easy. especially the ones with open type design. temps on the upper card will invariably be higher. try to keep temps on both cards below 75c. For stability test a 1 hr run of BF3 or Crysis 2 is good. It should run stable without any crashes.
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post #14 of 17
6/15/12 at 10:19am
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Quote:
Originally Posted by raghu78 View Post

Your cards are binned differently . thats why their stock voltages are different. I suggest you keep both your HD 6870s at 900 Mhz. I think your PSU is not a high quality one. It has 70% efficiency. maybe just enough. don't risk your PSU and your cards by overclocking. you could do some serious damage to both the PSU and graphics cards.
Also in a crossfire setup keeping both cards cool is not so easy. especially the ones with open type design. temps on the upper card will invariably be higher. try to keep temps on both cards below 75c. For stability test a 1 hr run of BF3 or Crysis 2 is good. It should run stable without any crashes.
well ive done temp tests and the top card is always 10-15 degrees hotter, but it stays below 70 and the second card is always super cool never going above 60 but yeah illprobably downclock my original to 900 like you said but what should i do with the voltage?
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post #15 of 17
6/15/12 at 10:22am
Thread Starter 
Quote:
Originally Posted by superj1977 View Post

I did experience the same with 2xHD5870 i had on water, i ended up flashing the second card with a copy of the first cards bios, there was no issue doing so as they where both the same card, reference models and there where no differences apart from the second cards clocks and voltages.
Once i flashed my second card i could control clocks and voltage on both cards but if i remember rightly i had to set same voltage for both cards which was a shame as the second card didnt really need the volts i had to give it.
Bios flashing is not easy if you have no experience doing so and it gets real tricky when your not flashing ref models as well.
If you went down that route id spend a few days reading up and taking advice on the whole process as you can end up with no video signals on your GPU if the flash goes wrong, you would then end up doing a "Blind flash" which is so difficult but can be avoided by having a spare card to pop in slot 1 if you "brick" a card with bad flash.
Always make backups of original bios first, just in case it goes wrong or you wish to sell them on and return them to stock bios, its literally a 2-3 second fool-proof process using GPU-Z thumb.gif
Also ask yourself....is it worth overclocking them? CF6870 is not to be sniffed at, some decent GPU power there even at stock clocks
lol i know 0 about doing that so idk if i'll ever do that maybe if my cousin ever comes down i can have him tinker with them he has a masters in computer science and has a behemoth of a rig and has been doin this since he was younger than me so id trust him! but not myself to do something like that biggrin.gif
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post #16 of 17
6/16/12 at 12:21am
Quote:
Originally Posted by HelenKeller View Post

well ive done temp tests and the top card is always 10-15 degrees hotter, but it stays below 70 and the second card is always super cool never going above 60 but yeah illprobably downclock my original to 900 like you said but what should i do with the voltage?

leave the voltages at their default settings. Set both cards at 900 Mhz. check for complete stability in games like BF3, max payne 3, crysis 2. if its stable just leave it at those settings. smile.gif
And don't go for anthing risky like flashing your GPU BIOS. you could damage your card. Also you don't have a dual BIOS option on your cards to fallback to the default BIOS if flashing fails in the 2nd BIOS. so don't do anything stupid.
Edited by raghu78 - 6/16/12 at 12:24am
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post #17 of 17
6/16/12 at 8:18am
Thread Starter 
Quote:
Originally Posted by raghu78 View Post

leave the voltages at their default settings. Set both cards at 900 Mhz. check for complete stability in games like BF3, max payne 3, crysis 2. if its stable just leave it at those settings. smile.gif
And don't go for anthing risky like flashing your GPU BIOS. you could damage your card. Also you don't have a dual BIOS option on your cards to fallback to the default BIOS if flashing fails in the 2nd BIOS. so don't do anything stupid.
i played like 7 missions on crysis 2 and it was stable smile.gif
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