Does anyone know what CPU’s fit the TR line?  I have been searching for 2 hours and can’t find what socket type it uses.  There are a lot of Pentium M chips on ebay for pretty cheap.  Can I put a 1.3 or 1.5 etc . . . in my tr3?

I’m afraid not. The Vaio TRs use a Pentium M ULV chip. LV and ULV chips are soldered onto the motherboard unlike regular chips which are socketed so these cannot be replaced/upgraded. Sorry.  :(

Although I have read that ULV chips can be overclocked fairly high, one person here stated that he overclocked the 1.2 ghz Pentium M ULV in his Vaio T350P to 1.6 ghz.