5V vs 3.3V RAM modules (TP701C)

[Marshall Lai <Marshall.lai@cornell.edu>]

First of all, bear in mind that the memory socket is designed for 3.3V circuits
Secondly, for a 5V IC to work, it REQUIRES 5V!!!!!
Third, according to Ohm's law, V=IR, where V=voltage, I=current, R=resistance.
So for the 5V memory board to work, the thinkpad MUST output a 5V to the 5V module, or else, there will not be enough voltage for the module to distinguish 0 and 1.  (I think anything > ~4.2 is considered 1.  Don't quote me on this.  I am not too sure).  So the current output is now 5/R instead of 3.3/R.  So the IBM tech is probably right......