vvbee
I had all Cu too. Heavy, can't be really used as passive if you care about temperature, clip is too tight so you can easily damage CPU or socket. Zalman was overhiped, but later models like 7000/8000 and Performa series really make difference (i'm using 8700, 9700 and P10+/11 right now on 939, AM3+, 775, 1155 and 1366).
I never had Athlon XP (PIII > P4 > A64 >A64x2), and never cared about "silence" till maybe 2012, because before that my PC never been used during nights.
A week ago i tested 1000EB with something "intel stock cooler" and titan/igloo + 80mm fan. After an 8-hour 3dmark (general system stability, mainly mobo and graphics card) CPU was about 45C. Athlon XP about twice more power hungry than Coppermine/Tualatin.