Agner's CPU blog

FWIW, I ran a test of my own on a Steamroller CPU, with clock speed locked at 3.9GHz. My test routines read or wrote 2048 32-bit words (8KByte) using a small loop, and this was done 1,000,000 times. I used one thread, two threads on the same module, or two threads on separate modules. In all cases, ...

Recently I've been reading your 'microarchitecture' guide with great interest. Thanks for making this available! Regarding the AMD family 15h CPUs, on pg. 220 you write: "It saves power quite aggressively by slowing down the clock speed most of the time. Some versions also lower the voltage to the C...