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HD 5850 Overclock

post #1 of 18
Thread Starter 
I have been over clocking my Sapphire HD 5850 Xtreme so far I have it 900/1215 I was running it at 1.1v but it wasn't stable as it crashed be style on me so have now have it at 1.2v, I would just like to know how others have got on overclocking the 5850 and how stable there overclocks are.
Overclock.jpg

Before anybody says why are you not using MSI Afterburner (witch I do really like) it does not allow me to change the GPU voltage at all.
    
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post #2 of 18
have you tried enabling "enable unnoficial overclocking" in the config file for afterburner?
a friend of mine couldnt overclock the 5850 I sold him using a newer version of afterburner, so I installed v1.6.1 and it worked fine so try that.

Anyways you dont want 1.2v for 24/7 use, you want to set the voltage at 1.162v because thats what the chips were designed for, and the 5850 uses the same chip as the 5870, only some shaders are locked, and the 5870 runs 1.162v.

The 5850 uses less voltage to make it more efficient and obviously its declocked so doesnt need it.

The pcb is smaller on the 5850 tho, so it gets slightly hotter than the 5870 using 1.162, but not much, its negligable.

I was able to get 950mhz/1200mhz out of mine at that voltage, and with 1.225 1000mhz/1200mhz but the 50mhz extra is hardly worth all the extra voltage.

So again 1.162v should keeo you on the safe side and allow 850/900mhz core and 1200meh memory minimum. Another thing is that the memory chips are also the exact same, so 1200mhz on them is also easily achievable as its the stock on the 5870
Edited by Juliancahillane - 8/14/11 at 5:28am
    
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post #3 of 18
Some non ref cards have to use Trixx to be able to change voltage,op obviously knows this.

I had 3 5870' last year and ran one of them at 1.35v for about 3-4 months under water and it showed no signs of degrading as far as benchmarks could show.

Obviously i would no way reccommend that sort of voltage on stock cooling but it may give you sort of idea of an upper limit for benching if it was on water.

EDIT

i managed to get 1Ghz perfectly stable in anything,on all my cards and they share the same GPU(Cypress) type as the 5850
Edited by superj1977 - 8/14/11 at 5:39am
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post #4 of 18
Thread Starter 
Afterburner would OC my card just would not at all let me change the Voltage, yeah I was not going more than 1.2 volts on air but the cooler on the Xtreme version is that little bit better than the stock one it is much quieter than the stock cooler that was on my old 5770.
    
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post #5 of 18
Get a water block on it and crank it up sneaky.gif
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post #6 of 18
Thread Starter 
Quote:
Originally Posted by superj1977;14578130 
Get a water block on it and crank it up sneaky.gif

If money was no object I would try water cooling
    
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post #7 of 18
Iv got mine at 920/1300 on stock voltage.
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post #8 of 18
Thread Starter 
Quote:
Originally Posted by Shame486;14578165 
Iv got mine at 920/1300 on stock voltage.

What cooler stock or Sapphire
    
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post #9 of 18
Stock Sapphire cooler, it's between 65-72C load. Guess I got lucky card.
It looks like this
attachment.php?attachmentid=35620&stc=1&d=1274141151
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post #10 of 18
Lucky if you are really stable with ram at 1215 on stock cooler i think.
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