> >The ThinkPad 755C with an SL enhanced DX2/50 is suppose to be upgradable > > Wait a minute! SL enhanced??? Is this the same kind of processor in the > 750c? If so, then why isn't the 750c upgradable to the DX4? I called this The SL enhanced is not the same as the chip in the TP750 series. The TP750 has a 486SL, not a 486DX with SL-enhancement.