Because that extra boost is determined by multiple factors, including how hot it is in the owner's case, how much voltage is needed to maintain the stock clock, and how stable it is.

Throw all those variables at hundreds of different computers in widely different temperature ranges and you get the base and boost levels advertised because that is what can be guaranteed. Anything more is a free bonus.

arestavo
Because that extra boost is determined by multiple factors, including how hot it is in the owner's case, how much voltage is needed to maintain the stock clock, and how stable it is.

Throw all those variables at hundreds of different computers in widely different temperature ranges and you get the base and boost levels advertised because that is what can be guaranteed. Anything more is a free bonus.

From my own experience, I have to disagree with this. When the card was new and without dust, the max temps would reach 65C and I could boost till 1359. With dust and being two years old now, it can reach 78C under max load. Again, I can still boost to 1359. I stop boosting when the thermal throttling kicks in if I never clean my fan for a longtime at 80C, when finally it won't reach 1359.

However, the above scenario can also be extended to the Boost 1.0 speeds. If there if a lot of dust and it's very hot, it may not even reach the Base clock speeds.

So I'm wondering, under a constant scenario, will all GTX 750 SC GPUs run at 1359 on my PC? Or is Boost 2.0 dependent on the quality of the cards themselves, rather than depending on the hardware of the end user (assuming no power, temp or CPU bottleneck)?

himmatsj
From my own experience, I have to disagree with this. When the card was new and without dust, the max temps would reach 65C and I could boost till 1359. With dust and being two years old now, it can reach 78C under max load. Again, I can still boost to 1359. I stop boosting when the thermal throttling kicks in if I never clean my fan for a longtime at 80C, when finally it won't reach 1359.

However, the above scenario can also be extended to the Boost 1.0 speeds. If there if a lot of dust and it's very hot, it may not even reach the Base clock speeds.

So I'm wondering, under a constant scenario, will all GTX 750 SC GPUs run at 1359 on my PC? Or is Boost 2.0 dependent on the quality of the cards themselves, rather than depending on the hardware of the end user (assuming no power, temp or CPU bottleneck)?

Not sure what you disagree with. The temperature does effect the ability to boost as well as the ASIC quality. Some GPU's get hotter than others and some run cooler. If you happen to get a card that has a low ASIC or runs hot, you should still be able to achieve base and boost clocks. But the boost 2.0 is not a guarantee.

DeathAngel74
Boost 2.0 is related to max voltage and temps. Basically, think of it like a CPU, IF the cpu is running cool enough, it will turbo at higher frequency. Its all about the silicon lottery, quality of the chip, ASIC, etc. There really is no point in arguing, its just the way it is. The cooler the card runs, the higher it will boost.
http://www.geforce.com/ha...gpu-boost-2/technology
 

You see, this is the problem I have. No matter the temps, be it 40C or 79C, the maximum possible value for me is 1359.

However, if like the other poster say it is dependent on the quality of the ASIC core, then that finally makes sense.

I had a PNY 750 that boosted to 1425 MHz, 76% ASIC. Evga 750 Ti 1398 MHz, 71% ASIC. My 970s are no different. One ran at 1368 MHz out of the box, 67.9% ASIC. The other 1425 MHz, 72.x% ASIC. Advertised core clock was 1216 MHz, max advertised boost clock was 1367 MHz. So mine were within specs. I had to work some voodoo magik to get them up to 1506.5 MHz 24/7/365, but it was worth it.

How do you calculate ASIC values?

You can open GPU-Z and right click at the top left corner of the program
(the little green graphics card logo).
There will be an option there called "Read ASIC quality...".

Its more like "disabling" boost 2.0, removing thermal, voltage, power restrictions and forcing the card to run at a fixed clock speed during games and benchmarks. Manipulating the stock firmware. I'm naturally inquisitive, so I don't overclock the conventional way, lol....I'm a tinkerer.

himmatsj
I have one final question regarding this matter.
 
Let's assume the following:
 
Core Clock: 1216MHz
Boost Clock: 1279 MHz
Boost 2.0 Clock (at stock settings): 1443MHz
 
Why do people overclock? Even if you +100MHz to the core, it gets you to 1316MHz only, which is still far below the boost 2.0 speed for that card.
 
Or is it such that, if you alter the value of the core clock, the Boost 2.0 clock will also increase?
 
Kinda confusing.

The Boost 2.0 clock speed will increase accordingly until you reach your TDP, voltage ot heat limits. You would probably wind up with 1543 MHz or more.

For anyone wondering, this is a very simple to read write up On the matter. It shows that the relationship between the ASIC rating and Boost 2.0 speeds (at factory settings) is linearly related.

Temperature, power, etc is not a determinant.

Kinda shocked to learn that there can be variance of as much as 10% performance difference between cards of the exact same model from the same manufacturer.

http://www.ocaholic.ch/mo...n/item.php?itemid=3946