The 7900GTX cards are really mean cards which overclock really well on the NVIDIA G71 core.

In fact 1GHz benchmarkable is not a problem! That's more than a 50% overclock from the default 650MHz! However, the memory on the card is not as overclockable. I've had trouble trying to hit 1GHz on the memory, the memory would get unstable all of a sudden and crash the system, even when there no visual artifacts on screen. First thing I've tried was to increase Memory voltage which did not help at all. Next I tried soldering some SMD capacitors to see if it helps but that didn't work as well. Next, I decided to try cooling the memory better. RAMsinks are usually used for this purpose, but I was looking for something more cooling... a lot more cooling. I could throw some Dryice on the memory but that would entail the hassle of ordering dry ice everytime I want to do some benchmarking. So I decided to try out something extreme, using refrigeration phase change on the graphics card memory!

I decided to go with a simple design as it is not known whether extreme cooling the Graphics card memory will help. Like that I would not waste a load of time and effort. So, I came out with this:

Don't get it? Well the next few pictures should give you a clearer picture. Basically, it's using a coil of copper pipes to transfer the cold to a copper plate which will then cool the memory. As seen above, I cut out a template for the copper plate from a piece of paper.