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Does Higher 'Kepler Boost' value = Higher Core OC Potential? Need Input!

post #1 of 69
Thread Starter 
Many of you have no doubt seen myself and others using the term 'Kepler Boost' (KB for short) on the site here by now, and I've been wondering for some time whether or not the KB value that one's card comes with relates to it's OC'ing ability on the core. I.E. I'm wondering if higher KB value = better OC potential.

The purpose of this thread is to do a bit of statistical analysis on this question, and I'd like to get all Kepler owner's input so we can see how the numbers shake out.

For those of you who aren't sure what I'm talking about, please check out the first link in my signature. The Kepler Boost, in a nutshell, is the DIFFERENCE between the 'Boost Clock' you see listed in GPU-Z, and the actual, observed core frequency when you put the card under load.

Here's one easy way to determine your KB (although at least one member is saying that his card won't ramp all the way up from this particular test ... in that case, you should probably use Heaven ... anything that'll ramp your card up all the way will do).
1) Fire up Afterburner with the OSD enabled, showing Core Frequency in the display, WITH your card running at it's max stable OC on the core thumb.gif
2) Fire up GPU-Z
3) Click the question mark (?) button next to the Bus Interface value
4) Click Start Render Test
5) Subtract the Boost Clock as seen in GPU-Z (in black, below) from the Observed Core Clock (in Red, below). For my card, the math here is (1337 - 1207) = 130MHz. Note that in this example my card is also OC'd via AB.

409

Please format your submission like I've done below, and I'll try to keep the OP updated with the list of submissions.

NOTE: Please try getting your max core OC value WITHOUT OC'ing the memory, because a memory OC (esp. a large one) can compromise your ability to OC the core, and the core OC is all I'm interested in. Also, for standardization, use the max core clock that's 100% stable in teh Heaven bench, no artifacts (except the one by the dragon that happens for almost everyone no matter what).

Keep in mind, I don't care about the offset you use, or what your 'stock' OC on the card was ... I just want to know your Kepler Boost value, and the highest your core clock will go (observed clock, not GPU-Z 'boost' value) ... and still be stable. If you have a card that actually overvolts over 1.175V, please just give the value that you can hit at 1.175V so we keep things standardized.

Note also that the KB value is always a multiple of 13, but Kepler's have clock straps (i.e. not every clock value is possible to hit) so you may have to fiddle with the slider a bit to actually determine your KB. I'd also recommend maxing your card's fan, and the it's power limit, when finding your max OC.

TIA everyone!

UserName --- Model --- Kepler Boost (in MHz) --- Max Core OC

brettjv --- Gigabyte WF3 --- 130MHz --- 1367MHz
sixty9sublime --- MSI N670GTX Power Edition --- 91MHZ --- 1250MHZ
FtW 420 --- MSI NGTX680 Lightning --- 143MHz --- 1384MHz
broadbandaddict --- Reference EVGA 680 --- 52 Mhz --- 1175Mhz
contruable --- MSI NGTX680 Lightning --- 143MHz --- 1283MHz
steven88 --- GIgabyte WF3 KB --- 130mhz --- 1310mhz
steven88 --- Gigabyte WF3 KB --- 65mhz --- 1194mhz
steven88 --- Asus DC2 NON TOP KB --- 130mhz --- 1300mhz
steven88 --- Asus DC2 NON TOP KB --- 65mhz --- 1145mhz
steven88 --- Asus DC2 NON TOP KB --- 104mhz --- 1244mhz
lightsout --- Asus DCII Non-Top --- 117mhz --- 1260mhz
FiShBuRn --- ASUS GTX 690 --- 39mhz --- 1215mhz
DrBoss --- MSI N670GTX Power Edition --- 117MHz --- 1316MHz
Arizonian --- EVGA GTX 690 --- GPU #1 26 MHz / GPU #2 52 MHz ---- 1149 MHz
MrTOOSHORT --- Asus GTX680 DirectCUII TOP --- 66MHz --- 1383MHz
bern43 - msi gtx 670 oc pe - 91 - 1215
Asmola --- Asus GTX680 DirectCUII TOP --- 210 MHz --- 1400MHz (on water)
Cyph3r --- Asus GTX670 DCUII NON-TOP --- 130MHZ --- 1200MHZ
nismofreak --- Gigabyte WF3 --- 108MHz --- 1277MHz
emett --- Inno3d GTX 680 --- 65mhz --- 1250mhz
HeadlessKnight --- EVGA GTX 670 FTW --- 143MHz --- 1323MHz
error-id10t - EVGA 670 SC+ - 130Mhz - 1296Mhz
DimmyK --- Asus GTX 680 DCII TOP --- 26MHz --- 1285MHz
sanjuroM --- Zotac GTX 670 4gb --- 130MHz --- 1255MHz
Forceman --- EVGA GTX 680 (reference) --- 65MHz --- 1280MHz
Edited by brettjv - 2/5/13 at 12:11pm
    
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post #2 of 69
Tried to do this but that test included with GPU-z takes forever to cause my card to reach full usage. It never gets to my max observed clock even after 5 minutes. But anyways, there are other ways to find your max clock.

sixty9sublime --- MSI N670GTX Power Edition --- 91MHZ --- 1250MHZ
    
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post #3 of 69
Thread Starter 
Thanks for contributing. Yes, true, there's lots of other ways ... I just feel like the GPU-Z test is so easy to fire up ...

It kinda surprises me your card won't ramp all the way up by running that test ... mine does so instantly headscratch.gif

I guess if that method doesn't work reliably I should make a note of it in the OP ...
    
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post #4 of 69
FtW 420 --- MSI NGTX680 Lightning --- 143MHz --- 1384MHz
    
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post #5 of 69
Ok so tell me if I'm doing this wrong.

broadbandaddict --- Reference EVGA 680 --- 51 Mhz --- 1175Mhz
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post #6 of 69
contruable --- MSI NGTX680 Lightning --- 141MHz --- 1283MHz
post #7 of 69
Thread Starter 
Thanks everyone, let's keep 'em coming, I need at least 30 values or so for it to mean anything thumb.gif
Quote:
Originally Posted by broadbandaddict View Post

Ok so tell me if I'm doing this wrong.
broadbandaddict --- Reference EVGA 680 --- 51 Mhz --- 1175Mhz

Hard to tell for sure ... I mean, the format of the submission is correct, but I can't be sure how you derived your result. Do you have any specific question about the process?
    
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post #8 of 69
I tried this yesterday, but I never got any readout at the top of the screen. Also, I had Afterburner running in the background and it showed that the test was only using one card even though I had checked the Crossfire/SLI box. So I don't know what to make of it.
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post #9 of 69
Quote:
Originally Posted by brettjv View Post

Thanks everyone, let's keep 'em coming, I need at least 30 values or so for it to mean anything thumb.gif
Hard to tell for sure ... I mean, the format of the submission is correct, but I can't be sure how you derived your result. Do you have any specific question about the process?

Well I used EVGA Precision X instead of afterburner and the last number (1175Mhz in my case) I took from the main clock that it was reading off. Just seemed a little lower than the other clocks posted. tongue.gif
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post #10 of 69
I do agree that the higher the out of box clock = higher OC potential. And this is speaking from personal experience

I first started with Gigabyte GTX 670s. One ran 1189 out of box, the other ran 1124 out of box....the 1189 ended up getting 1310 overclocked, and the 1124 got 1194 overclocked.

Then played around with some Asus DC2 NON TOP cards. One ran 1110 out of the box, and was able to OC it to 1300....the other ran at 1045 out of box, and overclocked it to 1145. Btw thats quite possibly the lowest OC 670 I have ever heard....my 1045/1145 card that is. My friend ended up getting a DC2 and his was 1084 out of box, and OC it to 1244mhz

Let me know if I am doing this correctly

steven88 GIgabyte WF3 KB = 131mhz / 1310mhz
steven88 Gigabyte WF3 KB = 66mhz / 1194mhz
steven88 Asus DC2 NON TOP KB = 130mhz / 1300mhz
steven88 Asus DC2 NON TOP KB = 65mhz / 1145mhz
steven88 Asus DC2 NON TOP KB = 104mhz / 1244mhz
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