925mhz at stock voltage, stable, is awesome. If btc value goes back up I'm going to have to invest in watercooling my 'lazy' 5970s
It isn't stock voltage. I am running 1.1625V right now. Likely I can bring that down but I am moving up in 20MHz steps until I hit max freq and then I will drop voltage until I find min voltage. The 5970s are "hardy" they can handle 1.625V.
The waterblock is the cheapest full block I could find for 5970. If I wanted to drop some money I would get an EK block but I was looking to build the cheapest possible system. I plan to write up a little guide/post about my adventures in watercooled mining using cheapest components I could find.
http://www.frozencpu.com/products/10069/ex-blc-705/Danger_Den_DD-5970_ATI_5970_VGA_Liquid_Cooling_Block_GPU-6899.html?tl=g30c309s1072
There is really no reason to watercool without a full coverage block because the VRM becomes the bottleneck.
There is really no reason to watercool any card except the 5970, 6990, and someday 7990 because their high price and the fact that you can cool 2 GPU is required to bring the cost per MH down to a reasonable level.