CNPS-7700-Cu weighs over 950 grams
CNPS-7700-Cu has a thermal resistance of 0.19 C/W
XP90 weighs less than 370 grams
XP90 has a thermal resistance of about 0.18 C/W
XP120 weighs about 375 grams
XP120 has a thermal resistance of 0.167 C/W
New development by ThermalRight:
SI-120 weighs about 400 grams
SI-120 has a thermal resistance of 0.14 C/W
Zalman makes nice stuff, but so far the CNPS-9500-LED looks like all hype. Where are the reviews with the thermal resistance results?
The obvious choice, assuming it doesn't interfere with motherboard or graphics card, is the SI-120. If it does interfere with motherboard or graphics card, then XP-90.
XP120 is also second-best. By adding a little weight, however, the SI-120 is a significant improvement on a cooler that is otherwise the best performing light-weight cooler in the market.