I need to upgrade my system and want to put the fastest speed memory supported in it, obviously. However, I don't know what speed the system can support. Compaq support have of course been totally useless. Is there a way I can find out which speed of (DDR) memory to use?
About all I can suggest is that you look at the motherboard and see if you can find out who made it and what model it is then go look it up on the manufacturer's website.
As and aside: Compaq have always made non-standard systems and have been very reluctant to give out information other than "Our upgrade is $xxxx.xx". Next time you buy a computer, get one from a local computer store (or build one yourself) using standard, brand identified, parts. You'll be a whole lot happier when upgrade time rolls around.