Originally Posted by bud74
Hello. Been playing around with 4 day old 980 ti G1 and I am really happy with the performance so far. One concern is the aggressive fan curve that I am using in afterburner keeping this gpu cool. Another thing that I am wondering though, is a asic quality of 70.9% worth keeping, or send back and try get lucky with a higher value? Is the chance better that I would get a higher card or are there a lot out there in the 60's. Thanks. I just dont want to spend this much money and get something that is inferior to more than not. Any thoughts?
If you happened to be looking at people trying to describe ASIC% on youtube, don't bother I haven't seen even one person that truly understood how it works.
I'll take some time for you and the audience for some ASIC% fun.Take it or leave it (no debates it's too overdone already)
You do NOT
have a bad ASIC% just so you know.. they are many with lower.. it is close to average and I assume your concern is with maximum overclock capability which with your GPU has almost nothing to do with ASIC% with Maxwell
. ASIC% only has an INDIRECT relationship with maximum overclocking ability not a direct one. It is also only one factor that determines the maximum overclock when there is more than one factor responsible. Maxwell is very power efficient therefore the voltage gap between low and high ASIC% cards has narrowed EVEN FURTHER than with older generation GPUs. Maxwell simply takes less voltage for even low ASIC% GPUs to perform at their maximum potential compared to previous GPU generations.I will explain further:
Of course we know that with a STOCK BIOS the voltages are defined in a range
with Maxwell. The BOOST 2.0 tech will automatically determine the voltage needed under full load
for any given BOOST speed. For the sake of simplifying this
, let's assume we have 3 GPUs that all have an IDENTICAL maximum overclock of 1525Mhz
however each one has a different ASIC% rating.
GPU 1 has an ASIC of 82%
(HIGH ASIC%) and @ 1525Mhz averages 1.212v or 1.225v to reach that speed.
GPU 2 has an ASIC of 72%
(MID ASIC%) and @ 1525Mhz averages 1.237v to reach that speed.
GPU 3 has an ASIC of 62%
(LOW ASIC%) and @ 1525Mhz averages 1.243v to reach that speed.
(each GPU is different, yours may vary)
^ These are real voltages seen with a STOCK BIOS under load by all 980Ti owners. As we can see although the ASIC% varies QUITE A BIT (from 62% to 82%) the actual VOLTAGE range is only 1.212v - 1.243va difference of only 0.031v
Now we can understand why ASIC% with Maxwell
has little value.. Anyone that thinks that the difference of 0.031v
is going to make any significant difference is dreaming
. The temps with that variance in voltage are also going to be well within normal/average ranges.
So as you can see, since Maxwell is power efficient the voltage range is very narrow. The only way you would be LIMITED BY ASIC% would be if you had such a low ASIC% that you needed to use a voltage higher than the STOCK BIOS would provide. You might need 1.250v or 1.256v volts to reach the GPU's maximum overclock potential with a super low ASIC%.
The last point to drive this home is that ASIC% (hopefully this is obvious at this point if I explained it well enough
) is ONLY
really about what voltage is needed to reach your maximum overclock. The lower the ASIC% the more leakage therefore the higher voltage you will need to compensate.
There is also a lot to be said about "Silicon lottery" because I can tell you there are MANY people out there that have a low/mid ASIC% and are able to reach a stable boost over 1550Mhz... there are also just as many with a high ASIC% that can't get over 1500Mhz boost..
Here is some more info. Keep in mind this is from 2012