VR-Zone did some tests with extreme cooling for graphics card memory:
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!