I wish to install some additional memory in an old Packard Bell Club 78 pc which is currently running (very slowly) on only 64megs of RAM.By looking at the current hardware I have established that it is a pc100 100mhz 64mb 168pin sdram module. I wish to upgrade with an additional 256mb module. Are there any further specs that i need to be aware of before purchase? Will any 256mb pc100 100mhz 168pin sdram module work regardless of manufacturer? Any help will be greatly appreciated. Thanks.