CPU coolers have got to be one of the largest subsets of the PC aftermarket, in terms of units sold. There are a few manufacturers that always seem to lead the pack when it comes to cooling performance, and users seem to have less brand loyalty than in most other segments of the market. These customers, wanting the best cooling they can get, have also proven to be willing to shell out premium money for the latest coolers. This time out, we’ll be testing a cooler from a relative newcomer, Apack. Their ZEROtherm BTF-90 cooler promises “Killer Performance” and “Silence Innovations”. Let’s see what Apack has brought to this highly competitive market.