Friday, August 10, 2012

Overclocking the Palit GTX 670 JetStream

 
Couple of months ago, I bought a GTX 670 made by Palit. I did not buy the regular version. I bought the factory overclocked card in their JetStream series.
 
Why did I buy a factory overclocked card? Answer is simple. I knew my overclocking mileage would not be great. With the 100MHz or so stock overclock, I would not have felt bad if I could not overclock it at all.
 
Then, why did I choose this particular card? Again, the answer is simple. This was the cheapest factory overclocked card I could find. GTX670_Jetstream
 
 
Regular GTX670
Palit GTX670 JetStream
Core clock
915 MHz
1006 MHz
Boost clock
980 MHz
1085 MHz
Memory clock
1502 MHz
1527 MHz
 
 
Anyways, I was right about my overclocking mileage. I couldn’t reproduce the results Wizard got in his review. After a lot of driver crashes, I managed to find the max clocks. Stress testing apps like 3DMark11 or Heaven benchmark are no use. Both were stable at clocks which were not stable in Crysis 2 or BF3. (I had to play through Crysis 2 once again to find out my max clocks.)
 
Note: For a comprehensive Kepler overclocking guide, visit here.
 
So, this is where I am at now.(BTW, I use EVGA PrecisionX for overclocking the card.)
 
 
Regular GTX670
Palit GTX670 JetStream
Overclocked
Core clock
915 MHz
1006 MHz
1076MHz
Boost clock
980 MHz
1085 MHz
1155MHz
Memory clock
1502 MHz
1527 MHz
1700MHZ

image

GPU-Z
 
It’s not a shabby boost because it is already factory overclocked, but it is not amazing either. People who bought Gigabyte and Asus are seeing much higher overclocks in general, but that doesn’t mean I would be so lucky. I should be happy with what I got.
 
BTW, it is a decent memory overclock, but memory clock hardly affects the performance. I am sure it only resulted in… like… 100 3DMark11 points up from stock clocks.
 
Finally, this is how the overclock affected the 3DMark11 scores. (btw, this is only Windows 8, in case you didn’t figure it out from the title bar of the GPU-Z screenshot above.)
 
Stock clocks

stock

Overclocked clocks

OC

I believe I can break 9500 because the Physics Score when overclocked is 100 points lower than when I ran it at stock clocks. Benchmarks are weird stuff!

Edit:

This is the highest score I have managed to get. But it is not stable in games. This is with a +130MHz overclock + 1.175V GPU voltage set in PrecisionX.

image
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