Workshop - OC and WC 8800 Ultra - how to break 12k 3dMark 2006 with 8800GTX and 13k with 8800 Ultra - Results, step-by-step
Author: Luka Rakamaric
Date: 24 May 2007

The first limit we got to was the 675 MHz, a point that almost all GTX?s freeze up. The 3DMark stress run was passed without any problems. The next step we tried was 702 MHz, 90 MHz more than the stock. The 3DMark passed without any problems again. Going up to 720 MHz was a real ?edge of our seats? situation, but it worked stable with no problems. Then we got to the next one, 729 MHz. Even though it was only a 9 MHz increase, the card couldn?t handle it, and the system froze up. Since the GPU temperature was only 58 degrees under load, we think that this is the level this particular card experiences current problems at and that further overclocking of the GPU requires voltmodding. We left the GPU at 720 MHz and started to raise the memory clock. The stock Ultra already has a quite high memory clock of 1080 MHz, which we thought was just below the limit of the installed chips.

Feeling confident after clocking the core to 720 MHz, we decided to put the memory clock immediately to 1188 MHz, over a 100 MHz increase. The card again passed the 3DMark test without any problems. The next step was also the final one, because the system froze at anything above 1215 MHz. That?s 2430 MHz when talking in DDR terms, or quite a lot for GDDR3 memory. It is interesting to point out that memory wouldn?t go further even when we got the GPU to stock, or even GTX levels, and vice versa, which is a behavior that we noticed on some older cards.

Check out all the screenshots and results on the next page.