Hello, got a phenom II X4 955 running very hot with stock clocks, idles at 34-40 degrees, and jumps to 61 degrees at load. I have chosen to replace the cooler as it was an old cooler from my socket 939 computer but it was made out of copper.
Anyways I have these choices. My case has a width of 7.08 inches. If there are any better coolers under 35 I would appreciate if you could post it here.
With this heatsink you can use a 120mm fan and the heatsink actually clears the ram slots so you won't have to worry about thier heatspreaders. It's 4.1" tall so that should fit your case.
If you didn't like it then the Coole Master Hyper TX-3 would be a good choice.
If you read my post you would see that I selected the CM tx3 for my choice and you should not lap any heatsinks that have the direct contact of the heatpipe with the cpu because you would then be laping the heatpipe itself and those are thin pipes so it would be very easy to make a hole in it.