thats about right from memory. the xp120 is just bigger and potentially quieter through use of a 120mm fan. i remember seeing a lot of tests where the xp90c was as good or better than the xp120, which is why i bought the 90c at the time. if you wanted a better heatsink, you really should have gone for a TT big typhoon,scythe ninja or a tuniq tower. one of those would easily outdo an xp90c or xp120.