If it is the older version, I think its a PAL35. It wont have the copper base, and the whole heatsink is constructed from aluminium. The fins are slighty larger too, and spaced a bit further apart. I would think it should be sufficient for cooling your Tbird, but make sure that the clip is strong enough, as my old PAL35 clip is far too weak for socketA. If this is the case, you could perhaps invest in a clip from the later PAL6035, which is much stronger 
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Duron 700@1096 2.07v Air Cooled
ALPHA PAL6035 & Delta 7000rpm
Abit KT7 Raid w/voltage mod
IBM 75 GXP UDMA100
Hercules ProphetII GF2 MX 250/210
256Mb Crucial PC133 CAS2
Belinea 10-30-40 17" 0.26
Turtle Beach Santa Cruz S/Card
ASUS 50x
Mitsumi 8x 2x CD-R
GlobalWin 802 w/5x80mm YS-Techs
Duron 700@1100 2.1v Air Cooled - RIP
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