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Max safe 7950 Voltage while OCing - Page 2

post #11 of 26
Quote:
Originally Posted by Fulvin View Post

Seeing you have so high ASIC (low leakage) on that card it's no wonder the extra voltage didn't help much.

Clock back down and enjoy the 24/7 goodness!

high asic is not low leakage...
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post #12 of 26
Quote:
Originally Posted by jdc122 View Post

high asic is not low leakage...

It surely is...low asic value is high leakage and high ln2 oc potential.
post #13 of 26
Quote:
Originally Posted by ivanlabrie View Post

It surely is...low asic value is high leakage and high ln2 oc potential.
Quote:
Originally Posted by jdc122 View Post

Quote:
Originally Posted by Blameless View Post

In my experience thus far low ASIC quality = lower leakage current = less current draw at a given clock speed = lower clocks at a given voltage = higher voltage needed.

All of my cards OC pretty close on air, but my highest ASIC (77%) card does do a bit better than the rest (54.9% to 74%).
i believe this is true. i'll try and find it somewhere, i have the page bookmarked on my phone (ill come back and edit it later) but i saw somewhere that an AMD rep on another forum stated that the lower asic chips were less leaky, and the reason they have a higher stock voltage is too keep the TDP the same across the entire range of both high and low leakage chips, because they arent the same as cpu's where the lower or higher quality chips of the same architecture can be relabelled as a different chip eg 950 is a higher clockspeed 920 etc. so a lower leakage 7970 will have a higer stock voltage to keep at at the same power draw as a higher leakage part.

please dont kill me if this is wrong biggrin.gif

Edit: Here we go; http://forum.beyond3d.com/showpost.php?p=1344008&postcount=29

"Actually, it does the opposite! We scale the voltage based on leakage, so the higher leakage parts use lower voltage and the lower leakage parts use a higher voltage - what this is does narrow the entire TDP range of the product.

Everything is qualified at worst case anyway; all the TDP calcs and the fan settings are completed on the wors case for the product range."

That Quote is from Dave Baumann, AMD product manager
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post #14 of 26
Quote:
Originally Posted by ivanlabrie View Post

It surely is...low asic value is high leakage and high ln2 oc potential.

It's the opposite.
"Low Asic" cards are the cool running ones, despite higher stock voltages.
post #15 of 26
Low asic value are the cards running hot but clocking good on cold...people want high asic normally for stock cooling usage.
I don't care really...not that big of a deal. I don't even look at that, I just test the cards and be done with it. rolleyes.gif
post #16 of 26
doh.gif

Dave Baumann with his random opposite world explanation.
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post #17 of 26
It does sound strange, and goes against what me and my team mates experienced lol
post #18 of 26
Thread Starter 
Sorry if this seems newbish but what exactly does the high and low asic do/mean? And would there be any hopes for bumping the core down and the memory up and that working or some other decent OCing combo?
Thanks, yodazb
post #19 of 26
There are certain ratios between core and mem that work best for certain apps...you just need to test which favors what and you're good to go.
I personally crunch data and some applications favor a 0.57 ratio and others need a higher core and slower memory.
post #20 of 26
Even the first reference Sapphire HD 7950 can do 1.25v and 1200 core and 1500 memory, it just gets hot and noisy... Im getting an Accelero Extreme for myself so that should keep it cool. Could go 1.3v with that really...
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