I have a thinkpad T60 on the way with 1gb (1 dimm) of pc2 5300 (ddr 667) and want to grab another 1gb stick from newegg to smooth out vista some. There's a good deal on pqi right now but it's 5400 (still 667). Will this work, and just run at the 5300 speed or am I safer spending another 20 bucks or so to get 5300 ram? Thanks