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[Official] AMD Radeon HD 7950/7970/7990 Owners Thread - Page 1382

post #13811 of 38739
Quote:
Originally Posted by MACH1NE View Post

any reason i should go gigabyte over directcu?
Yup, DCIIs HD 7900 are really buggy, HD 7970 DCII is voltage locked (no serius overclocking), and also VRM temps problems, Gigabyte is rock solid.
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post #13812 of 38739
Quote:
Originally Posted by MACH1NE View Post

Hey guys looking to grab myself a 7970 should I go with the gigabyte overclocked or directcu II, i'll will be running them on air and maybe go crossfire in a month or two, looking at achieving max overclock @ reso 2560x1600.

Gigabyte HD 7970 Windforce. probably the best cooler on any HD 7970.

http://www.hardocp.com/article/2012/02/08/gigabyte_radeon_hd_7970_oc_video_card_review/8

"While idling at the desktop, the stock GIGABYTE Radeon HD 7970's temperature was 34 degrees Celsius while the fans were running at 20%, and extremely quiet. Under full load the temperature increased to 67c, however fan speed only increased to 34%. We did not have any issue with the fans at this speed. On the overclocked GIGABYTE Radeon HD 7970 we had fan speeds set to 80%, which was not as loud as most video cards, and helped remove a ton of excess heat. At idle, the video cards temperature was 25 degrees Celsius. Under full load with fans still at 80% temperature only reached 56c. "

HD 7970 at 1300 Mhz at 80% fan speed and running at 56c on an open test bench. with a decent case with good air flow and lower fan speeds around 50% you should still be able to keep temps around 70c.
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post #13813 of 38739
Quote:
Originally Posted by xNAPx View Post

sure
I heard that is not soo good on heatpipe coolers, but i also see flat base in middle, am i right.
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post #13814 of 38739
thanks for the info guys, one last thing is the voltage unlocked on the gigabyte?
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post #13815 of 38739
Quote:
Originally Posted by MACH1NE View Post

thanks for the info guys, one last thing is the voltage unlocked on the gigabyte?
Yup, up to 1.3V.
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post #13816 of 38739
Quote:
Originally Posted by Kokin View Post

I got a worse score with 1200/1400. Maybe my core is unstable, gonna try a lower clock.

I think your core needs more voltage . Since you are watercooling and temps are not an issue if you are willing try pushing that voltage to 1.3v. Try 1200 / 1600 at first and then 1200 / 1800 . if things are stable and performance improves you could try 1250 / 1800 . Also check your VRM temps under load. Its better those VRMs stay below 100c for long term reliable operation.
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post #13817 of 38739
Quote:
Originally Posted by Statius View Post

You pansys. Take off your skirt and hit 1500 with memory.

You're gonna say that after my 1800 mem overclock? tongue.gif

My VRMs are also watercooled, they barely get hot to the touch with Unigine so they are running at around 40C, my core temps don't exceed 38C either.
Edited by Kokin - 7/27/12 at 1:59am
    
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post #13818 of 38739
Quote:
Originally Posted by Kokin View Post

You're gonna say that after my 1800 mem overclock? tongue.gif
My VRMs are also watercooled, they barely get hot to the touch with Unigine so they are running at around 40C, my core temps don't exceed 38C either.

Then you have nothing holding you back from going 1.3v for the core voltage. In fact sapphire trixx allows higher votages but I wouldn't advice going above 1.3v. With 1.3v and 1200 Mhz if performance improves your next aim should be 1250 and then finally 1300 (should be possible). user sonda5 has the same card running at 1300 Mhz core with watercooling . thumb.gif
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post #13819 of 38739
Quote:
Originally Posted by raghu78 View Post

Then you have nothing holding you back from going 1.3v for the core voltage. In fact sapphire trixx allows higher votages but I wouldn't advice going above 1.3v. With 1.3v and 1200 Mhz if performance improves your next aim should be 1250 and then finally 1300 (should be possible). user sonda5 has the same card running at 1300 Mhz core with watercooling . thumb.gif

Currently testing with 1.3v it seems like 1200 is a max for me. 1250 and 1225 were unstable and gave me horizontal lines. Makes me a bit disappointed, but my memory OC is wickedly fast.

Edit:

Retested 1200/1800 with 1.3v/1.6v.... looks like you were right about needing more core voltage. Now I'm sad that it takes 1.3v on water to reach 1200core for my card. thumbsdownsmileyanim.gif




I'll do more testing after work today and see if lower memory can grant me higher core clocks. Thanks for your advice!
Edited by Kokin - 7/27/12 at 2:27am
    
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post #13820 of 38739
Quote:
Originally Posted by Kokin View Post

You're gonna say that after my 1800 mem overclock? tongue.gif
My VRMs are also watercooled, they barely get hot to the touch with Unigine so they are running at around 40C, my core temps don't exceed 38C either.

If that 1800 mem is on stock mem voltage I really suggest to lower it.
90% chance that some or heavy error correction is kicking in.
Try heaven benches at a stable core speed and voltage and increase the memory with slow amounts.
100mhz max increase every time. That way you will notice when error correction kicked in (when fps dropped compared to previous run)

Good luck thumb.gif
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