5770 Overclocking

[SlapHappy]

I'm using MSI Afterburner to over clock my two Sapphire 5770 cards but I can't seem to get them stable above a core clock of 930MHz.  From what I've read on these forums I was expecting to get them higher.  What experience are others having with the 5770 card?

Thanks in advance.

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[jduck1987]

Are you increasing the voltage on the cards or leaving it factory?

[deslok]

1.) i use trixx not afterburner
2.) i only run my 5770 at 950mhz for stability sake

You can push them to 1000mhz but in my experience that tends to make them unstable after a day or two on regular air cooling, liquid cooling will produce better results as far as that's concerned. a small voltage bump may be necessary to reach that speed and you're going to want to downlock your memory to 300-400mhz depending on what's stable for your particular card

[P4man]

Overclocking is a lottery. You can get lucky, or not.
930 Mhz is a decent overclock. Some cards can do more, some cant. Better cooling could help push a few % higher, but even thats not guaranteed. There is a reason they are sold as 850 MHz

[johnj]

My main 5770 I can put at 1000/300

Got another one in today, 960 at best, 940 is stable.

It's only a loss of ~15 mh/s.  Nothing major.

[toliman]

you can also use the new CGminer, set the fans/thermal setting to 50% / 80'c using --auto-fan/--auto-clock and it will move between 850-1000 / 300 depending on the temps you want to maintain or how good your cooling is. it will also handle GPU load/crashes, etc.

i've run 2x5770 with aoclbf at 950/300 and 850/300 in a regular case, no power tweaking was needed. but, i think using cgminer makes it way easier, as you can see more of what's happening as it's happening, and it handles soft-restarts of the GPU pretty well if you're trying to find temp/voltage limits and tolerances while under load.

[Ayo_4_Yayo]

I just want to say you need to be very careful when doing this!

[strictlyfocused]

I cant get mine above ~950Mhz unless I lower the mem clock to ~335Mhz. I bump the voltage up as well to ~1200. Im sitting at 1020 and 335 right now which is turning out 237MH/s

[johnj]

I cant get mine above ~950Mhz unless I lower the mem clock to ~335Mhz. I bump the voltage up as well to ~1200. Im sitting at 1020 and 335 right now which is turning out 237MH/s

Be careful about overvolting.  AFAIK, the extra power consumption doesn't make up for the extra hashes. But of course your mileage may vary.

[maryamchaudhary]

thanks for your nice sharing

[strictlyfocused]

I cant get mine above ~950Mhz unless I lower the mem clock to ~335Mhz. I bump the voltage up as well to ~1200. Im sitting at 1020 and 335 right now which is turning out 237MH/s

Be careful about overvolting.  AFAIK, the extra power consumption doesn't make up for the extra hashes. But of course your mileage may vary.

If I kill the card it gives me a chance to convince my old lady to let me purchase another, hopefully higher-end card 

[Lacrimas]

Hi, currently i have 1 rig with 4x5770.
Now on every 5770 i put one CM fan so temps are round 68-74C.

Currently clock is 950Mhz(gpu)/300Mhz(mem) with factory voltage.
I tried it on 1000Mhz 1050Mhz. GPU was stable but Wattage and Temps were so high so i cant see point to do it for 10MH/s per card. Now i stopped on 950/300 i guess its best OC for 5770.

Good Luck and watch Temperatures and Wattage.