1.8GHz is still a frequency unfortunately many computer users dream about but it is now achievable on the dual-core processor powering the AT&T HTC One X (and Rogers) as well as the Sprint HTC EVO 4G LTE. Of course, before everything, we need to insert the word of warning here that extreme hacking can cause hardware damage and stress components, but you all know that!
The new Kernel module allows overclocking the MSM8960 Qualcomm Krait SoC beyond 1.8GHz in applications like SetCPU so you need to be cautious. It only works on the AT&T and Rogers HTC One X (or the One XL) as well as the Sprint EVO 4G LTE. If you want to give it a try, check out the source links below for your appropriate phone for instructions and downloads.