wanting to upgrade my processor
Problem is being an HP you can't expect them to have released any BIOS upgrades that would allow it to recognize anything other than the original 1st generation of the Core 2 Duo E6xx0 family. And I mean Core 2 Duo, not the Pentium E6xxx series since they run at a lower voltage. A voltage the BIOS wouldn't know to set. You may be able to find on e-bay or a store that sells used system one of these older Core 2s. No idea at what price.
As for the video card, I believe the wattage range for an x1650 is in the same range as a HD 5570 so it should work. The HD 5570 should be noticeably faster.
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$725 and $1350 parts lists --- My guide to computer components
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my current computer (except it's 32-bit)
given that my motherboard is 3 1/2 years old, it's still a core 2 duo, so I'm curious with the current processors that are out there, what are my options to upgrading to something stronger without having to buy a whole new motherboard? same thing with a new gfx card, I've had the same radeon x1650 since I bought this computer.