The list of all models and cpu available is here, most have been discontinued.
http://www.lenovo.com/psref/pdf/tcwbook.pdf
SOURCE: what`s the maximum processor upgrade
MAXIMUM CPU FOR IBM M51 = Pentium 4 650
3,40 GHZ / 2M CACHE / FSB 800 / HT / SOCKET 775 ( SL7Z7 or SL8Q5 ) they take 84 Watt, by the way, change the power supply,with connections for Pcie x16 graph-cards ,like 800 Watt. HD cards are not supportet, Max.- card is ATI x1950 Pcie x16 512MB. Do not try the ATI 5450 will not work.
Processors:
DO NOT THINK ABAUT THE P4, 651 / 660 / or 661 ,will not work .( multiplier is 17 ) and not supportet by the mainboard and chipset.
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