At idle, the Corsair Obsidian 650D’s thermal performance was on par with the larger, better equipped Thermaltake Chaser MK-1. While that’s impressive, the more affordable Lian-Li Lancool PC-K63 mid-tower delivered significantly better GPU, CPU and HDD temperatures. Under full load, the 650D again had a respectable showing. Even with the low fan speed setting it still provided very solid results. While the overall thermal performance is acceptable, the 650D certainly has room for improvement when compared to the Lian-Li Lancool PC-K63.