I've on the way a Compaq LTE with a 486SL at 33mhz. While this is probably sufficient, I'd like to upgrade it with an IBM 486DX4 I have sitting around when it gets here. I realize that the 486SL runs on 3.3v and an ordinary 486 on 5v, but would this be a problem? Would the 486DX4 run on 3.3v? Would the bus of the laptop be capable of 5v? Am I crazy?