Lost Circuits have posted their registered ECC DDR400 memory review for the Athlon64 FX and Opteron CPU's! with sticks from Kingston HyperX Registered ECC DDR400 (3:3:3), Legacy Registered ECC DDR400 (2.5:3:3), Samsung Registered ECC DDR400 (3:3:3), Mushkin Registered ECC DDR400 (2:3:2).