Although there are many ways to improve performance, ATI's goal is to push for higher CLK running in SYNC with the Memory. Some of the other methods include FSB/HTT Link, Memory Freq (via higher FSB/HTT or RAM divider), Memory timings, overclocking the PCIe bus and video cards.

[NL]http://www.ocworkbench.com/2006/ati/rd600/g1.htm[/NL]