O.K. I know this is probably a no brainer, 2k or 4k refresh rate, but I honestly don't know. Is the 4k TWICE as fast as the 2K? Friend has an HP Pavillion 8140, has 4 slots, 2 occupied= total 32MB RAM. I just want to max out (128MB) his RAM.RAM installs in pairs. So I think he needs 4 pieces of 32MB RAM, right?? 2K or 4K? Thanks, I don't know jack about SIMMS. 