What is my likelyhood of success \"underclocking\" SDRAM? I want to upgrade a 233 Pentium system with 66MHz FSB, but for just a couple of $$ I can upgrade from 66 to 100 or even 133. In the past, you could always put fast memory in a slower machine, but I have heard that the SDRAM is not always \"down\" compatible. I know that I won\'t realize a performance gain, I just want to buy memory that I can recycle in future (faster) systems.