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[Official] AMD Radeon HD 7950/7970/7990 Owners Thread - Page 174

post #1731 of 38704
Quote:
Originally Posted by Pantsu View Post

More than likely. A 74% quality card is the high end of 1,175V cards so these probably OC the best. The 83% card most likely can't take as much voltage and won't go as high, though it might be more stable at lower voltage.

Quite possible. I will do some testing of the 83% card and see if it can keep up with the 73% card tonight. Also, not sure how much water cooling would let me go above 1280/1790 as I am maxing out at pretty mild 62C.

Also, for those that mentioned something about setting memory too high and it causing errors and slowing the card down hasn't materialized for me. Every memory increase in my testing has resulted in faster benchmarks.
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post #1732 of 38704
Quote:
Originally Posted by CallsignVega View Post

Quite possible. I will do some testing of the 83% card and see if it can keep up with the 73% card tonight. Also, not sure how much water cooling would let me go above 1280/1790 as I am maxing out at pretty mild 62C.
Also, for those that mentioned something about setting memory too high and it causing errors and slowing the card down hasn't materialized for me. Every memory increase in my testing has resulted in faster benchmarks.

Same here. I had to take it above 1900MHz before I saw an even benchmark and 1925 to see any loss. It's a fairly linear gain from 1350 all the way to 1875 for me.
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post #1733 of 38704
Just checked my ASIC %'s

Card 1 --- 72.6%

Card 2 --- 61.3%

Well I am able to run 1200 core on both so... rolleyes.gif

Maybe I will RMA the second card wink.gif
post #1734 of 38704
Im not able to run 1200 on both at all...
Seems like TriXX and AB are giving me problems. I get artifacts and such, even at stock. But when I unistall them and use CCC, I can get 1125/1575 on both without problems...
post #1735 of 38704
My 7970 right now is 87%ASIC @ 1.05 default volts and I just ordered a second one. What if my second one is 1.175v? How would I overclock them in CF? My card right now is very volt sensitive, meaning anything more than 1.1v would induce a lot of heat and I would prefer not to. Could I OC each card individually? My 1.05v could go to 1.175, but it would get hot, fast. I am not sure if a 1.175v card could drop down to 1.05 or even 1.1v to get them both equally volted.

Seems like there are many variations for 7970 volted cards whereas my 570 SLI, they were both default stock and wasn't a big gap in between like 1.05-1.175v 7970s. If I do get a 1.175 VID card, what would be my options? 1.1v in between? Or undervolt the 1.175 card, but I won't be able to OC? Since I'm going to have two, I'm not worried about OCing too much maybe only benchmarking, but gaming, my goal will be 1125, even 1025 would be more than enough.
post #1736 of 38704
You should be able to OC them individually, including the voltage. AFAIK CrossFire cards don't need to work at same frequencies or voltages. Of course they should have comparable performance, otherwise it might cause problems.
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post #1737 of 38704
I'm torn. I got an XFX Black Edition. It easily clocks 1250/1510 with stock cooling and default mem voltage (3dmark, heaven dx11, games). BUT, it does strange things like artifact all over the place at stock settings in Heaven dx9 and will continue to give artifacts in any game until I restart my system, it squeals at high fps (not the fan), has a lower-pitched buzz when running any game, and generally makes me uneasy. I figure the only thing to do is rma it but newegg hasn't had any in stock for a while and the card clocks well. I bet I'm going to RMA it and get sent a "refurb" card that someone else returned and newegg just repacked without testing and it won't even boot. Aaarrrgggg.
Edited by Mrip541 - 1/23/12 at 2:55pm
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post #1738 of 38704
Guess what just came in!!!!!!? LOL i was waiting all day and the UPS guy just dropped them off on the doorstep didnt even ring the bell, who knows how long they were outside lol....Ninja UPS ph34r-smiley.gif
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post #1739 of 38704
Quote:
Originally Posted by sockpirate View Post

Guess what just came in!!!!!!? LOL i was waiting all day and the UPS guy just dropped them off on the doorstep didnt even ring the bell, who knows how long they were outside lol....Ninja UPS ph34r-smiley.gif

I bet it was a "beware the moose" caution street sign!
post #1740 of 38704
Like this one biggrin.gif
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