 We really like Deepcool's new CPU coolers, the AS500+, and the AK620. Which one has better performance? We tested both with an R33100, not the hottest CPU, but one we've used many times for benchmarking. So we know what temp ranges it usually pumps out. The case we used was Deepcool's mesh front CG560. Long story short, the AK620 wins by just a little bit. On idle, temperature of the AS500+, was 35° versus only 33° with the AK620. On 100% load, after 30 minutes, max temp reach for the AS500+, was 49° versus only 47° for the AK620. 2° doesn't sound like a lot, but we expect an even larger performance gap if you run hotter CPUs. So the AK620 has a definite edge in cooling versus the AS500+, although personally, I really like the look of the AS500+, so I would choose it over the slightly better performing AK620.