I'm worried my corsair vengeance RAM won't let me use a nice 120mm heatsink due to size of both the RAM and 120mm heatsinks, so what are some good smaller alternatives?. I'm O/C'ing my i5 2500k to 4.5ghz and would like a heatsink that handles great under a full load.
I have 4 RAM slots with corsair vengeance, an Asus P8Z68-V lx motherboard, and a full ATX case.
Take a look at Corsair's and Antec's sealed water coolers. Never heard of them leaking, and they take very little space on the cpu area. I would suggest the Corsair H60/H70 or the Antec Kuhler 620. If you have a little bit more money in your budget you can get the Corsair H80/H100 or the Antec Kuhler 920.
What's your budget and case?
I have a Thermalright MUX-120( L133 x W58 x H160 mm) and 4 dimms of Dominators(same height as Vengeance) fins intact = fits like a glove!
The MUX-120 has been replaced by the True Spirit 120(L133 x W52 x H160 mm)
Its slimmer and a very good cooler for price/performance if you can find one.
Thermalright fans are on the quiet side btw.