Excellent value cooler,
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This review is from: Zalman LQ310 Ultimate Liquid Cooler for CPU (Accessory)
Great cooler for the money. I did replace the fan with a Corsair SP120 performance edition, which makes this thing work like a dream, even at low fan speeds.
I also replaced the thermal paste with some Arctic MX-4 straight out of the box, as they supplied paste isn't great according to reviews.
Installation is pretty simple, certainly easier than a lot of the giant air coolers you can buy.
I have this on an Intel 3770K OC'ed to 4.5Ghz, and have limited the fan to 1400RPM (and it's pretty much silent) . Even with this OC, and my ambient room temp being 32c, running prime95 never caused the temp to go above 72c (although I got lucky on the CPU lottery, and my OC is on just 1.92v, which helps keep the temps down).
When you first power it up, the pump/liquid seems a bit noisy, but after a few minutes this settles down and you can't really hear it at all.
All in all I'd recommend this if you aren't going for extreme overclocks, it's a good performer and nice and quiet when coupled with a decent fan at a limitied speed.