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Unstable 4870 OCs, help!

Last response: in Graphics & Displays
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March 23, 2009 8:30:41 AM

i can't seem to get a decent OC out of my 4870.

if i put the clock above 770 3dmark06 crashes fairly quickly, and furmark crashes almost instantly. the auto tune in catalyst control center sets it to 840/1080 and declares it stable and then my benchmarks die in one second. an error comes up saying "vpu recover has reset your graphics accelorator as it was no longer responding to graphics driver commands." my 4850 overclocked nicely, i'm not sure what the problem is here. i'm doing my OCs out of CCC, like i did with my 4850

i have this sapphire 4870
my temps never exceeded 70C, increasing the fan speed had no effect on stability :/ 

i've read of people getting to 840/1000+ with stock coolers so i'm not sure what the deal could be. also, seems like at stock now my 3dmark scores have dropped since i OC'd O.o


and ideas as to what the problem may be? suggestions?


other specs:
catalyst 9.1
cpu: phenom ii x4 940 @3.6
mobo: biostar TA790GX 128M (NB@1800)
ram: 4gb ddr2 8500, 1066mhz 5-5-5-15
psu: 750w
all other temps are also stable, in the 35-50C range.

More about : unstable 4870 ocs

a b U Graphics card
March 23, 2009 9:36:37 AM

You probably have the ATI Overdrive ticked on the CCC. If so, turn it off then use the auto tune or oc it manually, then lower the core by about 20mhz and the memory by 50mhz and it should be stable 24/7.

You probably should get catalyst 9.3 as well. My 4870 maxes at 890 core 1190 memory with the stock cooler on cold days.

Edit - woops, I should say that 890/1190 is what the ATI auto tune goes to. It's not stable at those clocks ofc :p  Best to manual tune it to what it passes then drop by 20 clock and 20-50 memory. Truth be told the ATI tune is really quite whacked.

As for the dropping 3dmarks, that also happened with me with 9.1 catalyst and was fixed when i installed the 9.3.
!