Hello. I have what I believe to be a Pentium 4 1.4GHz 256K cache 400Mhz FSB Socket 423 in an Intel D850GB mainboard with 640 MB of Ram, in a total of 4 Rimms (2x64 + 2x256). I was thinking about an processor upgrade but my reseller tells me that the most powerful processor I can get for my system is a Pentium 4 1.9GHz 256K cache 400Mhz FSB Socket 423. Are Rimms dead? Is ddr the most fast solution available? Any help would be appreciated.