Graphic Cards Overclocking HD 6770

#[member='Jarod']

[# GameR1120 , Please do not suggest overvolting a GPU to a new overclocker
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I did not suggest him to overvolt the card. I just told him that if he wants to run the card at stock HD6770 speeds, he needs a voltage bump.(Maybe I did not clearly mention it which made you think otherwise)

Btw, HD6750s are also lower binned cards and they are able to oc almost as good as 6770s. That's why I said if you got lucky you would run it at stock speeds.

#[member='nikhilkdipsar']

Please before fiddling with voltages, take guidance from members and other sites. Also keep a watch on temps.
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GameR1120 said:
Clearly, the card is not getting enough voltage. Default voltage for HD5/6770 at 850/1200 is 1.125V. So, just download MSI AB, post your voltage, we will help you after you post your voltage. At 775/1000, the manufacturer must have reduced voltage to keep the temperatures under control. Hate to break it to you this way, but I think that maybe purchasing a downclocked card was not a good idea, because naturally, the manufacturer must have cheaped out on components. But if you get lucky, you could be able oc it at stock HD6770 with a voltage bump at stock i.e 1.125V. But don't expect it to reach much, past that.
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#GameR1120 , #Jarod

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i didnt knew it was underclocked , i had no knowledge about graphic cards , though i had a doubt this 775/1000 thing , i asked in my other thread b4 buying the card , ppl said just buy 6770 from SMC , so i did .

My friends card is Sapphire 6770 with 850/1200 base speeds , and he overclocked it to 900+

Jarod said:
Most of the time the GPU core can scale fine, but the RAM will be lower speed stuff. So start with finding the RAMs limitations first.
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i didnt get u here
 
Your core voltage/Vddc at full load is the default 1.125V. So its not undervolted.

Your GPU core might be able to do 850, since they do not follow speed binning religiously. As Gamer1120 said, even the 6750s are clocking well.

However your card's memory chips will most likely be rated only for 1000MHz clocks, so they might not overclock much.

Thats why I said overclock either the core or the memory at a time, so you can determine each one's limits separately.

I saw your buying thread, and everyone told you to get an MSI or Sapphire and even pointed out that the core clock makes a difference in performance.
 
Jarod said:
I saw your buying thread, and everyone told you to get an MSI or Sapphire and even pointed out that the core clock makes a difference in performance.
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only 2 models were there in 6770 ,models within my budget ,

sapphire (underclocked version only ) and

gigabyte (i didnt knew wats its clock speeds , coz is not mentioned over the box)

the MSI model which they suggested me from SMC website in that thread was 800 Mhz core clock and was not in the stock of SMC that time and they didnt knew wen they can provide me one ... so i trusted SMC guy n bought gigabyte instead .

wats done is done ,now how do i proceed in determining limits & stability ? can u explain in bit details

thanks
 
Furmark has dropped artifact testing, so dump that.

Get OCCT, its got an error checking mode - http://www.ocbase.com/index.php/download

Run OCCT GPU stress test at stock clocks and note your peak temperature.

Leave your memory alone first. Increase GPU Core clocks in Overdrive by segments of 10 or 20MHz. Each time you increase it, run OCCTs GPU stress test (tick the error check button) for about 5 mins. When it starts erroring back down by about 20MHz.

Once you've figured out what value the core is stable at, drop GPU clock by another 20MHz. Then start overclocking your RAM by 10 or 20MHz intervals again, and error test in OCCT as you did for the core.

Finally run OCCT for a couple of hours and run some games, use whichever game was crashing for you earlier as a final stability test. For 24 x 7 use I would recommend setting all clocks atleast 20MHz below whatever is the stable value.

Keep an eye on your temperatures throughout this process. I'm not sure what the 6770's temp limits are. Stay below 90C to be safe.
 
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