42  Experiments with phase change cooling on GPU Memory

In pursuit of further overclocks on graphics card memory, one looks into several aspects, such as memory voltages. When it does not help much, we start looking at cooling. 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!

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

1gigcore  Experiments with phase change cooling on GPU Memory

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:

20  Experiments with phase change cooling on GPU Memory

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.