Thermalright Ultra-120 CPU Cooling Heatsink

Pros: Very efficient cooling! Stock HSF ran at 41C idle on C2D E4300. Now at 28C w/Scythe S-FLEX SFF21F 120mm Fan. Max load running TAT 47C. Awesome!

Cons: Do your homework on this...HSF is very heavy. Highly recommend extra support for top of HSF on vertically aligned MB's. I didn't kill my MB, but I think I just got lucky. I experienced MB flex failure after 2 weeks of unsupported HSF. I wired to the top of the case and no failures for 2+ days and counting. Keeping fingers crossed.

Overall Review: Cooling wise this is a great product worth every penny. From an engineering perspective it should have some additional support designed into it. The back plate works great, but PCB's just aren't designed to support this much weight on the end of a lever. It's simple physics.

Pros: Probably the best heat sink made if you modify the mounting system - but with the poorly engineered mounting system its 10 c hotter then the butterfly one. I truly think this is the best heat sink available today as far as its potential and ability to cool. Unfortunately it does not even get hot. that is the heat is not going into it, as my chip cooks. The only good thing is newegg let me return it. I bought another else where only because i hoped at (i had an order of items unavailable from newegg) the time the heat sink was dished. I suspected the mounting system - my instinct was right! It does not mount tightly, you clearly see it the cylindrical mounting posts move up and down when the board flexes, or by moving the heat sink.

Cons: Does not fit flush do to poorly engineered mounting system. This heat sink cost me alot of money in time and a sub par computer. I love thermalright but this ... as cost me so much!

Overall Review: I shipped a $2500 computer with a back up after this disastor of #$%%. The mounting system does not allow the heat sink to be compressed flat on the chip. I spent many hours studying and testing this heat sink. The thickness of your board has a major influence on the pressure and the flatness of the interface. To fix this heat sink use rubber spacer on the bottom to force the heatsink to flatten out.