GTX 670 Boost Speed

[[TW]Fox]

Hi guys,

I'm trying to get my head around how these Kepler GPU's work. I've been using this article:

http://www.overclock.net/t/1265110/the-gtx-670-overclocking-master-guide

I followed the instructions to work out what my Kepler Boost was.

During Heaven benchmark, the maximum GPU clock was 1149Mhz. My boost clock is listed as 1085Mhz in GPU-Z. According to the article, this makes my Kepler Boost 64Mhz. The GPU never went above 62c in the test and the power target is 145%.

The article says:

Each card has a different maximum Kepler Boost. For example, some cards will have a KB value as low as 104MHz (and perhaps even lower) and some as high as 234MHz, the average is somewhere around 130MHz and 143MHz

Unless my calculations are wrong, the maximum Kepler Boost on my card would appear to be fairly shockingly poor. Have I missed something here?

Overclocking seems more complex with these cards. I originally thought it was a case of just increasing the offset figures for GPU and memory and job done.

 

[seekdestroy]

I'm also interested in this, so does it vary from each unit? Much like the way some CPU's overclock better than others?

I don't understand how on product pages for the GPU's they state a boost clock, or is the boost clock simple a max of what they managed?

 

[mikeo]

Totally lottery.

 

[andybird123]

an out of the box boost clock in the mid 1100's is pretty normal / good
a base model 670 has a boost clock of 980mhz, so your KB against base is 169 (for comparison)

 

[Space Monkey]

Kepler cards have a standard core clock speed and a boost clock speed, so for example, my card (EVGA FTW 670) has core 1006, boost 1084, so specs say my boost is 78mhz, but mine boosts to 1124 without any help from me, so my boost is a total of 118mhz (78+40), are they working it out like that in the article, don't have time to read it?

 

[bilston]

Ive recently got a 670 and also trying to work out a stable clock. It'll happily do 130mhz on the GPU and 600mhz on the memory, independently[/] but when I try to combine, it's a massive headache figuring out the stable combination. Currently running Crysis 3 at 50GPU/600MEM and no crashes so far. I've had it at 85/300 and it crashes fairly consistently. Really strange.

 

[OptimaLnrg]

Hi guys,

I'm trying to get my head around how these Kepler GPU's work. I've been using this article:

http://www.overclock.net/t/1265110/the-gtx-670-overclocking-master-guide

I followed the instructions to work out what my Kepler Boost was.

During Heaven benchmark, the maximum GPU clock was 1149Mhz. My boost clock is listed as 1085Mhz in GPU-Z. According to the article, this makes my Kepler Boost 64Mhz. The GPU never went above 62c in the test and the power target is 145%.

The article says:



Unless my calculations are wrong, the maximum Kepler Boost on my card would appear to be fairly shockingly poor. Have I missed something here?

Overclocking seems more complex with these cards. I originally thought it was a case of just increasing the offset figures for GPU and memory and job done.

1085 is the manufacturer guaranteed boost up from the base clock of [insert here] the extra boost above 1085 is down to luck.

And your original thought was correct. add an offset and the cards boost will be higher by that amount. simples.