Originally Posted by Sweetcheeba
After a bit more searching I discovered GPU-Z had a bug so I downloaded the latest version. It's showing B1 now
For a minute I thought it was a bit strange.. and I had some kind of mutant lol
Not sure how relevant ASIC really is in terms of overclocking headroom with lower volts is but it's reading 81.0%. Looking forward to getting it under water and having a play
Originally Posted by alancsalt
I think asic is a measure taken at manufacture and embedded in the chip that decides the stock voltage range that card receives. It is not a measurement of anything "active", just an embedded value that can also be read by GPUZ. How much that affects overclocking, who knows? - personally I think there's more to whether a card is a good overclocker than just ASIC.
Yes, there is no correlation to OC besides the voltage leakage but from there you can extrapolate some values, not that any particular ASIC will give you a particular OC but it will tell you you're going to need more or less voltage to do it; another thing is ASIC is percentage based but we can group them, meaning some values will fall within a certain voltage!
ASIC quality < 75% - 1.1750 V
ASIC quality < 80% - 1.1125 V
ASIC quality < 85% - 1.0500 V
ASIC quality < 90% - 1.0250 V
ASIC quality = 100% - 1.0250 V
my article on ASIC:"ASIC score is more an indication for nvidia and amd and for us only a measure of leakage in our chips (thanks to W1zzard from TechPowerup we can see the value in GPUz), its good to know the ASIC if youre going to run SLI because it want to have closely similar ASIC score on your cards because they will have similar voltages and you can clock/volt them together without having to go separate settings if you get big difference ASIC ( i.e: 60% - 80%)
@TSMC for nvidia and FAB1 for AMD, as the chips are removed from the waffer, are tested and fused with the voltage that is reflected on the leakage of every chip!
Originally Posted by Dave Baumann Product manager AMD about ASIC
"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 worst case for the product range"
A high leakage card operates at lower voltage to balance the otherwise higher power draw and temps. It will also overclock higher than what a low leakage card would. The problem is though, cards usually have a limit of voltage increase, i.e. say +150mV , which means AB could overvolt a 1.15V card to 1.3V, but a 1.1V card would crash above 1.25V.
A high leakage card is what you want if you do extreme OC, and you can keep the card cool (H20,LN2 etc.). Your mileage will vary of course, not all low VID cards are good OC cards, and not all high VID cards OC bad. It's a part of product binning, they try to fit in as many chips as possible to a similar ASIC spec.
From "the man" himself W1zzard - Techpowerup:
"it's from the gpu silicon, and it's used to calculate the gpu voltage.
"bad" gpus get a higher voltage so they make the default clock. "good" gpus can do it with lower voltage
as you've seen in this thread, the scale for nvidia isnt perfect yet, so i'll apply some fixes once I have more data that suggests the typical ranges of gpu leakages"
PS - Alan, how that 680 Classified thing is? Still no go?
(Team skyn3t)Edited by OccamRazor - 3/10/14 at 9:07am