which memory to select for E8400 Q33 Express system?

[zapp22]

guys I have a new-to-me Compaq small desktop DC5800 that has the Q33 express chipset and E8400 dual core clocking 3ghz; bus speed 1333MHz. in today's world of RAM, what RAM spec should I install? I'm wanting to max it out. four slots, dual-channel - and I'm running win7 ulti x64

thanks for your advice

 

[LittleJay]

HP Compaq dc5800 Microtower PC (KA435UT) specifications - HP Products and Services Products

The above link is to the HP/Compaq site where you can view the specs for your computer. It looks like your model will support up to 8Mbs of PC2-6400 DDR2-800 memory. You can check to see what you currently have installed and go from there. Without more information than what you have provided, I really can't make a recommendation other than to match the type and size of the RAM currently installed with any new memory you buy.