Are they really necessary? And how do you attach them to a chip, is it a permanent thing that you need epoxy for, or what?

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Lian Li pc12 case
431 watt enermax ps
PIII 1ghz
ASUS CUSL2-C w/ipanel
256 megs cas 3 pc133
Leadtek gf2 64 meg
SBLive! 5.1
45 gig IBM 75gxp
12x Creative DVD-ROM
12x/10x/32x Plextor CDRW
3com 10/100 NIC
Sony CPD-G400
Windows 2000