Sony RX550 - what can I upgrade?

[TaylorD]

http://www.sel.sony.com/SEL/consumer/ss5/office/vaio/desktopmodels/pcv-rx550_specs.shtml

Its a P4, but i think with the 133mhz memory - its 1.5ghz.

I haven't had a chance to open it, anyone know offhand what is the fastest processor i can throw in there?

 

[JackHawksmoor]

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[TaylorD]

i figured that'd be the case...

but i am not looking to update this to be a hot machine, I just want to know the tops it can do... and if its cheap enough, Ill do it.