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Gigabyte HD7950 Windforce 3 Overclock - Page 3

post #21 of 80
Thread Starter 
Quote:
Originally Posted by raghu78 View Post

yeah HWinfo64 is the same. 1 Ghz at stock voltage is good. also memory overclocking is less important than core overclocking. you could back off the memory to 1350 Mhz

Ok, cool.

Also could you explain why memory overclocking is less important?
(It's not that I doubt you, I just want to know why, cause it will help me understand overclocking better. (I think heheh)
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post #22 of 80
Quote:
Originally Posted by Sleazybigfoot View Post

Ok, cool. Also could you explain why memory overclocking is less important? (It's not that I doubt you, I just want to know why, cause it will help me understand overclocking better. (I think heheh)

the HD 7900 cards have more than enough bandwidth with a 384 bit memory system. The core overclock makes a bigger impact in improving performance. you can check for yourself running Heaven 3.0 at 1 Ghz core clocks and running at 1250 Mhz and then 1350 Mhz memory. repeat that with core at 900 Mhz and 1 Ghz while keeping memory at 1350 Mhz.
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post #23 of 80
Quote:
Originally Posted by raghu78 View Post

the HD 7900 cards have more than enough bandwidth with a 384 bit memory system. The core overclock makes a bigger impact in improving performance. you can check for yourself running Heaven 3.0 at 1 Ghz core clocks and running at 1250 Mhz and then 1350 Mhz memory. repeat that with core at 900 Mhz and 1 Ghz while keeping memory at 1350 Mhz.

QFT

Kepler cards benifit more from a memory overclock, due to their smaller memory bus.
post #24 of 80
Thread Starter 
Aah ok.

Thanks for explaining that.

If the time comes when I need to overclock higher, i'll be back hehe.

Thanks a lot for now.smile.gif
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post #25 of 80
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Hey, I couldn't help myself and tried to overclock it to 1100 again, it went better this time, I just upped the Mhz in steps of 25Mhz until I got a crash, then I upped the mV with 0.005 everytime until it worked again, after the first mV up I took steps of 5Mhz (I got to 1075Mhz, after that I had to up the mV).

Eventually I got to 1100 with a voltage of 1.125 and the Heaven benchmark passed, launched Battlefield 3, got a crash after I drove off with the atv so I upped the mV with another 0.005V, got a little further but still a crash, crashed again, ended up at 1149 mV (1.150V is what I typed in MSI Afterburner), I don't get any crashes now, but if I go in the Mobile artillery and start firing, the smoke trail will sometimes cause a colored/blocked pattern, (Like a chess board, except the black is a RGB color), I continued upping the voltage with increments of 0.005V until I reached ~1.170V but it didn't change anything, so I changed my voltage back to ~1.150V.

Now I'm wondering if anyone of you have an idea of what is going on?

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post #26 of 80
You should run unigine in loop for at least 30 mins to see stability. My 7950 can do 1270MHz unigine but won't pass 1250MHz in game at 1.3v. Usually you have to lower by 20MHz (minimum) from bench to game to have something stable.
Seeing artifact without crashing may be caused by the memory. Down clock it a bit and see if the artifacts disappears.
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post #27 of 80
Quote:
Originally Posted by Sleazybigfoot View Post

Hey, I couldn't help myself and tried to overclock it to 1100 again, it went better this time, I just upped the Mhz in steps of 25Mhz until I got a crash, then I upped the mV with 0.005 everytime until it worked again, after the first mV up I took steps of 5Mhz (I got to 1075Mhz, after that I had to up the mV).
Eventually I got to 1100 with a voltage of 1.125 and the Heaven benchmark passed, launched Battlefield 3, got a crash after I drove off with the atv so I upped the mV with another 0.005V, got a little further but still a crash, crashed again, ended up at 1149 mV (1.150V is what I typed in MSI Afterburner), I don't get any crashes now, but if I go in the Mobile artillery and start firing, the smoke trail will sometimes cause a colored/blocked pattern, (Like a chess board, except the black is a RGB color), I continued upping the voltage with increments of 0.005V until I reached ~1.170V but it didn't change anything, so I changed my voltage back to ~1.150V.
Now I'm wondering if anyone of you have an idea of what is going on?

Some chips hit a wall at certain frequencies.
You can try to increase the voltage even more, unless you are overheating.


My guess is that the memory is having heat issues. Try to downclock it a little bit.
post #28 of 80
Thread Starter 
Where can I find the temperature of the memory, HWiNFO64?
Cause everything GPU related in there does not pass the 65 degree celcius mark.

EDIT::::::::

If I understood you guys correctly, I had to lower my Memory Clocks, so I set them to the default 1250Mhz and tried again, still getting those artifacts.
Edited by Sleazybigfoot - 11/17/12 at 2:14pm
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post #29 of 80
Quote:
Originally Posted by Sleazybigfoot View Post

Where can I find the temperature of the memory, HWiNFO64?
Cause everything GPU related in there does not pass the 65 degree celcius mark.
EDIT::::::::
If I understood you guys correctly, I had to lower my Memory Clocks, so I set them to the default 1250Mhz and tried again, still getting those artifacts.

In this case, either you need to give the card more juice, or you've reached it's limits.
post #30 of 80
Thread Starter 
Quote:
Originally Posted by splinterize View Post

In this case, either you need to give the card more juice, or you've reached it's limits.

I'm at 1.193V right now and I think it's gone, so I guess I wasn't lucky and didn't get a beast overclocker mad.gif.
Oh well, still very pleased with this card compared to my GTX470. I ran Low with that card (mesh quality on ultra), and got LOWER fps than I have now with evertyhing on ULTRA. So yeah, massive FPS increase for me.

Also how do people get 1200Mhz clocks, I can only max to 1100Mhz (I don't know if this card will reach that, I have a feeling it won't but i'm just curious)
Edited by Sleazybigfoot - 11/17/12 at 2:36pm
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