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> I also think the 5x86 is a clock tripled chip, so the installed chip > would be configured to run 25Mhz externally and 75Mhz internally, > rather than the full 100Mhz that its designed for. The AMD WWW site > has lots of info on 5x86 upgrades. The AMD 586 is clock-quadrupled (unlike the corresponding Cyrix, which is only tripled but faster for other reasons, so that the Cy586-100 is roughly comparable to the AMD586-133, both replacements for DX33 chips). > Personally, I may do the upgrade myself when my warranty runs out, I Big mistake! Neither the AMD nor the Cyrix are 100% pin-compatible with the Intel - for example, there's a pin on one of them used to trigger clock-multiplication, not on the other one. Your motherboard needs to recognize the chip, and your BIOS needs to be able to activate features (like the caching, which surely is different from that on the IBM-made 486 in the 701). Now, there *are* tiny boards available for about $125 from several vendors, which contain the 586 chips and somehow make them fully compatible; these are sold for painless upgrades of 486 desktop systems. Possibly one of these can be soldered onto the 701 MB (or a ZIF socket can be soldered on, and one of these boards plugged into *that*), but I don't know if there's room. I expect that the reason the upgrade for the 701c is so expensive is that they incorporate a customized form of one of these boards. - David (ross@math.hawaii.edu)