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I've got a 770 with a Pentium MMX 233 and 96MB. It doesn't seem to be impaired at all. I didn't use it with the original 64MB configuration very long, and when I did it was with Win95 (I quickly changed to NT4), so there's no basis for comparison. Maybe I'll take out one of the 32MB chips for a day and check it out. I'd be interested in hearing from other people on this issue... Later, Rob -------------------------------------------------------------------------- Rob Bell Senior Consultant, CPD Professional CSC Consulting, Minneapolis, MN rob_bell 'at' csi 'period' com -------------------------------------------------------------------------- Christoph Eyrich wrote: > The Technical Reference for the TP600 (600tech.pdf) contains the > following paragraph: > > Cacheable Address Space Cacheable address space is defined as system > memory that resides on the system board (0 640 KB and 1 MB 256 MB). > Cacheability of system memory is up to 64 MB for Pentium or 512 MB for > Pentium II in the L2 cache. Nothing in address range hex A0000 BFFFF, I/O > address space, or memory in any AT slot is cached. > > As far as I know, upgrading RAM beyond the cacheability limit severely > impairs system performance. There are reports that system performance > decreases by about 40% (in this case: PII, upgrade from 512MB to 640MB). > > Am I right that there is no point in using more than 64MB RAM in the > MMX model? If so, this should also be true for the TP560 - which takes > up to 96MB. > > Any comments? > > Regards > > Christoph Eyrich > > eyrich@zedat.fu-berlin.de