"It represents the arbitrary number Nvidia or ATI assign a die based on its
location and performance figure they are trying to target. Just like it was said
before a lower number should have higher leakage, but may also mean a closer to
the edge die cut. If everything else were equal a number such as 85% should
yield a balance between leakage so you can throw more voltage at it and non
faulty transistors from die defects."
"The asic level referes to the electrical leakage level. Higher leakage, uses more current, lots more. Low leakage less voltage for the current clock speed. A high asic card would use less voltage to run at the stock clocks. On air you want the highest asic card you can get. On water you want something around 74%. 60% and under is for liquid nitrogen."
Referring to a low ASIC number likle 50%
"It looks to me like all this means is that your card may have one or more (or perhaps all) of the following characteristics:
•Higher default voltage
•Higher power consumption
•Lower chances of overclocking using the stock cooling or some air cooler
•Higher chance of overclocking using water, dry ice, LN2, phase change, etc (this may mean that your best bet for overclocking would be to use water cooling or better)
In other words, if you're not interested in tweaking it or overclocking it, then having a low ASIC quality may mean absolutely nothing.