Overclocking

A true enthusiast is never satisfied and always looking to edge out a little performance when they can. Even if you don’t plan on keeping your card overclocked, a lot of people give it a try to see what they could have if they wanted. When it came to overclocking the GTX 770 I took the same approach that I used on the GTX 780 and all of the other Kepler cards before it. I start by pushing the limits of the GPU Clock Speed Offset to see how far I can push it. To do this I turned up our settings in precision to the max 106% power target and 94 degree temperature target then turned the fan up to 100% just for good measure. From there I started with a high 200Mhz because our GTX 780 hit over that. When that failed I went down to 148 and worked my way back up until it failed my 3dmark test. In the end I hit 174 after turning up the voltage, oddly enough you can only turn up the voltage one notch to 12mV, but that was enough to get 174Mhz offset to pass after failing. The end result while running my 3dmark test was an overall clock speed of 1320Mhz, a highly respectable number if you ask me!

overclock 2

From there I did the same thing with the Memory Clock Offset but something interesting happened. Keep in mind the GTX 770 uses new memory that is faster than ever used before, aka 7000Mhz memory after it is doubled. So I started at a memory clock offset of 204 and bumped it up over and over trying to find out max. It wasn’t until 487Mhz that I saw a single artifact in my test but nothing worth freaking out about. I pushed past all the way up to 637Mhz when I finally had more artifacts than I could handle. It actually passed my test, but I was terrified the whole time the test ran that I was going to trash our brand new GTX 770. Imagine that phone call to Nvidia, we have had your card for 6 hours and I have already blown it up!

When you hear 635Mhz offset it doesn’t really set in until you realize that gave us a memory clock speed of 8280Mhz! Of course that wasn’t going to do it so I bumped it down to 600Mhz and ran it again. This time I did see more artifacts but nothing like the last test.

overclock 3

Next I put both of our results together and ran the test once again to see if the card could do both at the same time. Shockingly it ran through the test and even had fewer artifacts than on the similar memory test. All in all I have to say that the GTX 770 overclocked very well, especially on the memory side. To show you all, I have put together my testing for all to see. It’s interesting to see that sometimes a bump in offset might not give actual results when boost is taken into consideration.

GPU Clock Speed Overclocking

GPU Clock Speed Offset

Pass/Fail

Resulting GPU Speed

FPS Result

Notes

200Mhz

Fail

1330

N/A

148Mhz

Pass

1280Mhz

54.15

168Mhz

Pass

1293Mhz

54.64

187Mhz

Fail

1320Mhz

N/A

174Mhz

Fail

1306Mhz

N/A

174Mhz

Pass

1320Mhz

55.53

increased voltage 12mV

181Mhz

Fail

1320Mhz

N/A

increased voltage 12mV

Memory Clock Offset Overclocking

Memory Clock Speed Offset

Pass/Fail

Resulting Memory Speed

FPS Result

Notes

204Mhz

Pass

3713Mhz

48.97

240Mhz

Pass

3744Mhz

48.97

302Mhz

Pass

3802Mhz

48.99

355Mhz

Pass

3861Mhz

49.07

434Mhz

Pass

3938Mhz

49.12

487Mhz

Pass

3996Mhz

49.15

saw one artifact

531Mhz

Pass

4037Mhz

49.14

saw one artifact

575Mhz

Pass

4082Mhz

49.25

saw two artifacts

637Mhz

Fail

4140Mhz

49.29

Completed test but LOTS of artifacts

600Mhz

Pass

4104Mhz

49.24

Saw 10 artifacts

Combined GPU and Memory overclocks together

GPU Offset

Memory Offset

Pass Fail

FPS Result

Notes

174Mhz

600Mhz

Pass

56.32

4 Artifacts – 12mV overvoltage

overclock 4

 

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garfi3ld's Avatar
garfi3ld replied the topic: #31185 30 May 2013 19:56
One of two reviews that we published today, check out Nvidia's new GTX 770

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