By default, stock NVIDIA GeForce 6800 Ultras will be running a core frequency of 400MHz as well as a memory frequency of 550MHz. Knowing that there are multiple board vendors who will likely be pushing the envelope with regards to frequencies, I was eager to see how much headroom this reference board had in store. Keep in mind that although this board is rather polished, this is not a retail version of the GeForce 6800 Ultra. As such, the results we see with this board may or may not be indicative of the type of success you might have with a retail board down the road.
Running 3DMark03 at default speeds, we saw a very impressive score of 11,789. Curious as to how far we could push this card, we began to raise the core frequency. Initially, it appeared as though we would be able to run a core frequency of 450MHz. Unfortunately, 3DMark03 encountered a few issues resulting in a score in the 7K range. Backing off a few MHz, we found the highest stable frequency for the core to be 440MHz.
Moving our attention now to overclocking the memory, our initial target was anything above 1.2GHz as that is the default speed these modules are rated for. Surprisingly enough, that memory frequency would not pass the stability test in the drivers. In fact, the absolute highest frequency we could run was 1.19GHz. Hopefully, this strange scenario is limited to these reference boards and will be ironed out with the retail cards.
With a final combination of 440MHz for a core frequency and 1.19GHz for a memory frequency, we saw a score of 12, 626. This was a healthy increase of 837 points from our default score. Having spent no money and exerted no effort to do so, any performance increase on top of already incredible results is a welcomed addition.