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>>The ThinkPad 755C with an SL enhanced DX2/50 is suppose to be upgradable >>to a DX4/75. If anyone has done the upgrade by themselves, I would >>appreciate hearing (please e-mail me) the details of what needs to be done. > >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 >place (PCS) and they said the 750c wasn't upgradable because of pin >incompatibilities, but that the 755 family was. What gives? The 750 was one of the last notebooks to use a real Intel 486SL. The SL series had many power saving features, as well as certain motherboard circuitry built in, all in the name of saving power. Eventually, Intel decided that the power savings wasn't all that great and they'd be better off keeping the same dies and working in other ways to save power. The result is the "SL-enhanced" series, which are basically low voltage 486SX/# and 486DX/# chips. The latter are pin-compatible with their desktop cousins (as well as themselves) and are upgradable. The 486SL only came in 25MHz and 33 MHz versions and were discontinued before Intel came up with the idea of clock doubling. The 750 series processor isn't upgradable. Everything from the 755 on is (unless the design has the CPU soldered in or something). _______________________________________________________________________ |\ ______________________________________________________________________\ | | | | | John H. Kim "Just try telling the IRS you don't feel like | | | jokim@mit.edu 'contributing' this year come April" - Bob Dole | | | jokim@uni.uiuc.edu on Bill Clinton's avoidance of the word "taxes." | \|_______________________________________________________________________|