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7970 Lightning, worth the premium?

pgi947 said:
Doesn't that kind of prove that these cards are directly aimed at exotic cooling? As the theory behind ASIC quality is that a lower scoring chip would fair better on water/LN2?

I had a quick look about earlier, the lowest ref 7970 ASIC I could find was ~70%
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Most of the low ASIC cards I have seen all been poor even under water.

Yet I have seen some with low ASIC clock well.

The higher ASIC cards have on average clocked better.


contradiction there though - which means ASIC doesn't mean much.
 
Haven't really had time to play too much in ln2, in stock BIOS I've got the core rock solid at 1220 for 1.215v, not too keen on pushing the voltage much higher on air.
 
Just got my Active dual link mini displayport adaptor, for £74 worth of adaptor the packaging is pretty poor, just a plastic lock bag, was expecting it to be in a box I suppose.

Oh well, long as it does what it says on the tin :D
 
This post from the thread Nickolop posted earlier explains what it 'should' mean.

jomama22 said:
well theoretically, with lower asic you have more leakage thus more volts flying through the entire chip. Since ln2 can take care of the heat from the leakage, your main problem would be voltage consistency throughout the chip (something you cant really control) so what ends up happening is you need more voltage (thus the higher stock voltage) to keep a consistent clock. it is the opposite for higher asic/lower stock voltage. What tends to happen is if we were to plot out each cards stats on a graph, somewhere the two lines (cards) voltages/clocks will cross (id say around 1500 core clock) now, what many people believe is that the lower asic will prevail because of the extra leaked voltage that actually helps you attain higher clocks at those speeds/temps since temperature would be the only fixable problem. I have not gone and dis proven this personally, but talking to many ln2'ers, the higher asic is actually better in the end because the silicon itself provides a more consistent delivery of power, whether its higher or lower voltage, so those chips can handle the highest voltages (1.6+) more successfully and in the end, provide better overclocks (though they will most likely take more voltage to reach the highest overclocks)

honestly, asic is a small piece of the puzzle, its all about the nano sized channels of silicon and how well they are structured in the chip itself. This is why the lighting goes to strides to condition the voltage prior to reaching the gpu (and why they achieved a 1800 mhz clock as apposed to the 1700 previous record). the more consistent of power he chip uses and produces, the better chance you have, thus why i believe higher asic is truly better than lower when using ln2.
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My 7970's are seriously underperforming. 15FPS in BF3 5760 - I am not impressed.

High settings, I should be getting around 50
 
Cleeecooo said:
My 7970's are seriously underperforming. 15FPS in BF3 5760 - I am not impressed.

High settings, I should be getting around 50
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Something not right there at all, thought you sorted the 15fps problem?

Have you tried 12.2, sure someone mentioned they are currently the best for multi-gpu with the 79x0 cards.
 
I really hope it's just a software issue. They're being erratic.

I've ordered a new SSD and i'll be reinstalling windows, it'll hopefully be sorted with that.
 
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