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5850 Overclocking (help needed) problems

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May 15, 2010 7:42:42 AM

Hey everyone,
Recently i tried to overclock my gpu. It went all fine, i disabled the CCC limits of Msi afterburner and started oc'ing. My only problem is, I can overclock my gpu smoothly but when do i need to raise the core voltage? Every time (now running on 1100mV) i run a game on these clocks my whole pc reboots after 15 mins of gameplay.

So does anyone know how i need to find the ideal voltage to be stable?

Thanks
a c 126 U Graphics card
a c 126 K Overclocking
May 15, 2010 1:36:35 PM

Right start back at stock 725/1000 1.087V.

I'd be very surprised if a HD5850 couldn't max out CCC so put the clocks to 775/1125, Use Furmark to test for maximum temps and stability ( Monitor temps with GPU-Z).
Leave it to stress for 15 minutes, if all is well up the Core by 10Mhz, test again, and repeat this process until either you see artifacts, the driver crashes or anything like that, At which point up the voltage by 100mV and test again for stability.

Keep upping the Mhz and voltage until your happy with your results or temps or stability become an issue. Once you've found an overclock your happy with I'd recommend you stress test for a few hours to make sure its 100% stable.

I'm not sure how to up the Vram voltage so you'll just going to have find the max stable overclock on the ram with stock volts, mine is 1230Mhz

Hope that helped.

P.S I wouldn't go over 1.3V for 24/7 use
May 15, 2010 9:44:10 PM

Rustyy117 said:
Right start back at stock 725/1000 1.087V.

I'd be very surprised if a HD5850 couldn't max out CCC so put the clocks to 775/1125, Use Furmark to test for maximum temps and stability ( Monitor temps with GPU-Z).
Leave it to stress for 15 minutes, if all is well up the Core by 10Mhz, test again, and repeat this process until either you see artifacts, the driver crashes or anything like that, At which point up the voltage by 100mV and test again for stability.

Keep upping the Mhz and voltage until your happy with your results or temps or stability become an issue. Once you've found an overclock your happy with I'd recommend you stress test for a few hours to make sure its 100% stable.

I'm not sure how to up the Vram voltage so you'll just going to have find the max stable overclock on the ram with stock volts, mine is 1230Mhz

Hope that helped.

P.S I wouldn't go over 1.3V for 24/7 use


thanks, im now using your guide :) 
If i would now howto do it, i would mark this as a best answer but guess what, i don't know :o 
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a c 126 U Graphics card
a c 126 K Overclocking
May 15, 2010 11:42:00 PM

No problem man, hope you have a good 5850 and it overclocks alot :) 
May 16, 2010 10:14:26 AM

Rustyy117 said:
Right start back at stock 725/1000 1.087V.

I'd be very surprised if a HD5850 couldn't max out CCC so put the clocks to 775/1125, Use Furmark to test for maximum temps and stability ( Monitor temps with GPU-Z).
Leave it to stress for 15 minutes, if all is well up the Core by 10Mhz, test again, and repeat this process until either you see artifacts, the driver crashes or anything like that, At which point up the voltage by 100mV and test again for stability.

Keep upping the Mhz and voltage until your happy with your results or temps or stability become an issue. Once you've found an overclock your happy with I'd recommend you stress test for a few hours to make sure its 100% stable.

I'm not sure how to up the Vram voltage so you'll just going to have find the max stable overclock on the ram with stock volts, mine is 1230Mhz

Hope that helped.

P.S I wouldn't go over 1.3V for 24/7 use


I now managed (i'm still busy) to get my core on 840mhz stable with no higher voltage. I think my gpu was unstable just because i highered the voltage when it whas not needed. Thanks alot, i'll keep you up to date lolz
May 16, 2010 10:29:46 AM

Rustyy117 said:
No problem man, hope you have a good 5850 and it overclocks alot :) 


I did what you said, if the driver crashes, higher the core voltage with 100Mv, well my pc rebooted and my fans started spinning loud. So i assume its 10Mv? ;) 
a c 126 U Graphics card
a c 126 K Overclocking
May 16, 2010 2:44:27 PM

zipzoomflyhigh is right, make sure your temps are below 90C, if your temps are too high your PC will shut down.

About the voltage, you've managed to get to 840Mhz with stock voltage which is good, but it wasn't stable (?) If it wasn't then up the voltage by no more than 100mV and test again for stability.

Like I said before don't exceed 1.3V for 24/7 use and don't exceed 90C (check temps with GPU-Z)
a c 125 U Graphics card
a c 100 K Overclocking
May 17, 2010 1:04:56 AM

My maximum 5850 OC is 985 core 1200 mem at 1.225V. However, at stock volts I keep it at 875/1200. At 1220 or higher memory I'm getting sporadic issues - sometimes it's fine but then once in a while a game crashes so I backed it off to 1200 which is a nice amount anyway. No amount of extra voltage seemed to help the memory so it seems like it's the utmost max. I also can't go over 1000 core even with as much as 1.3V it crashes after a while. Not a big deal tho and with 875/1200 at stock voltage I'm quite happy. Some people can get them really high, 1000+ core and 1250+ mem but I think those must be modded or just really, really lucky. Temps wise I never let it go over 80C in FurMark.
a c 126 U Graphics card
a c 126 K Overclocking
May 17, 2010 2:16:13 PM

wolfram23 said:
My maximum 5850 OC is 985 core 1200 mem at 1.225V. However, at stock volts I keep it at 875/1200. At 1220 or higher memory I'm getting sporadic issues - sometimes it's fine but then once in a while a game crashes so I backed it off to 1200 which is a nice amount anyway. No amount of extra voltage seemed to help the memory so it seems like it's the utmost max. I also can't go over 1000 core even with as much as 1.3V it crashes after a while. Not a big deal tho and with 875/1200 at stock voltage I'm quite happy. Some people can get them really high, 1000+ core and 1250+ mem but I think those must be modded or just really, really lucky. Temps wise I never let it go over 80C in FurMark.


Yeah they do seem to vary alot in terms of overclocking. I can get mine to 922/1230 with stock voltage, but I need 1.225V for 1000Core, anymore than 1050core and I need alot of voltage (1.32V+)

I don't think you can adjust the memory voltage, only the core. : / I haven't found a program for it anyway, maybe RBE would work.

August 3, 2010 3:50:44 PM

I only get mine up to 800 / 1200 with 1.1V
ASUS Radeon 5850 (EAH5850/2DIS/1GD5)

Is it possible to get it higher or something without changing volt??
I have asked in many other forums but they all said that i had to have more volt to change anything..
!