Verified answer

Preinstalled processor on Compaq 7585 Desktop is :

AMD K6-2 550 MHz

As per the HP tested data, that is the maximum upgrade that the Motherboard supports.

However, you can recheck with it at any nearest HP Authorised Service Center. If you are in USA check out with the following URL to locate the nearest HP Authorised Service Center :

Comp-USA

http://www.compusa.com/locations/default.asp

BestBuy

http://www.bestbuy.com/site/olspage.jsp?id=cat1209...

RadioShack

http://www.radioshack.com/corp/index.jsp?page=stor...

You'll need to know what processor "socket" you have and the maximum processor speed that the motherboard can support, then you can search newegg or tigerdirect to see if they have a faster processor. One easy way is to download a program called "Sandra" but if you're not very computer savy, you definitely want help from a friend that knows computers.