Athlon 64 Overclocking Guide

Written by John Chen    Monday, 08 November 2004 00:00
Article Index
Athlon 64 Overclocking Guide
Testbed and Multipliers
Command Per Clock
All Pages


For me, the most interesting technology of the AMD Athlon64 processor is not the 64-bit processing power. 64-bit desktop processors are bound to be made sooner or later. What I found interesting was the fact that AMD decided to have the memory controller on the CPU itself. This certainly raises a lot of eyebrows. Normally the motherboard Northbridge chipset is the memory controller, providing the transition between CPU processing and memory fetching. This is no longer the case. Compatibility will no longer be between motherboard and memory, but rather CPU and memory. The on-die memory controller has a lot of little secrets that not many people are aware of.

A little while back, I wrote an article on the performance effects of the Command Per Clock function found in most nForce2 motherboards. If the term "Command Per Clock (CPC)" is unfamiliar, perhaps the term "Command Rate 1T/2T" will refresh your memory. To give a brief summary, running 1T increases performance significantly. However, you must have memory that is capable of running the command rate at 1T, as well as having single sided modules. Double sided modules will work with 1T, but forces enthusiasts to drop the command rate to 2T in order to raise FSB during overclocking. Along with a bunch of other tweaks, the effects of Command Per Clock will be uncovered. Through this article, I hope I help answer most of the frequently asked questions about Athlon64 overclocking.