As i didnt found anything about this in this forums, i thought i should bring this up to you.
i didnt tested, so i dont know if it will work, but i think you should know how to do it if you wanted to.
Its an overclock module to any MSM8x60 device, originally made for the Sensation and EVO 3D, but in theory, it works with the dual core S4 as well, since it is for "all" MSM8x60, and this "x" is a variable, so it can be for Both 8260 and 8660(S3 SoCs) and 8260A, 8660A, 8960,8960T(S4 SoCs)
And to make you happier, i heard the same applies to the GPU overclock module (made for S3, but didnt found it...). ;D
FOUND BEFORE POSTING
OC for Krait, made for One XL/AT&T/Rogers One X/One S
NOW STOPING ASKING EPINTER ABOUT OVERCLOCK! lol