higher memory bandwidth yeh, not really effective on an athlon system but you are sure to notice in on a northwood core where the fsb is twice as fast
my system;
2800+,
NF7-S V2.0,
2x512mb geil pc3700 dual channel ram DDR,
ti4200 A280 LTD leadtek (still plays latest games perfectly),
4x200gb hdd, 1x80gb
SB Live! Sound card
LG L1710S 17" LCD
Mx700 cordless keyboard mouse
liteon dvd reader / cd burner (seperate)
my ti4200 used to run at like 50+ degree's and that's effect memory performance (tests), i improved the airflow, removed some things, added a top exaust rear intake and window intake and the memory bandwidth increased a few percent, video card runs on full load at 30 degree's