The ThermalRight Ultra120 X fits just fine on my Asus P5k Deluxe. I use a P180 case, which is practically identical to the P182 you mentioned, so I can't comment on the case. I can say that if you get a case any narrower than the 182/180 that it will be a tight squeeze. I was careful the first time I slid the side back on because it looked like it might hit, but all was well.