There are two groups with two coolers in each group of the non-interference cooling (NiC) offerings from Thermaltake. There are the NiC F3 and F4 for starters, and these offer PWN controlled fans with wire fan clips, and an exposed heat pipe cooler between the pair of fans of the F4, where the F3 comes with only one fan. Another thing separating them is the TDP where the F3 is rated for 160W and the F4 is rated for 180W. On the flip side there are the more aggressive solutions with the NiC C4 and C5. Here again there are raised TDPs and the C4 is rated for 220W while the C5 is rated for 230W, and both C-series coolers have two fans on them. This time the fans are slid into some very cool fan shrouds, and as for the cooler, we are now looking at a finely polished base with heat pipes now soldered into the two piece base assembly.
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