Hi, I currently came across a Intel Pentium D 820 2.8 ghz duo core processor, for free from a friend is it compatible with my Dell Dimensions 4200 mother board? Currently running a P4 3.0 ghz processor (single core) 32 bit vista 4 gigs ram with a 512mb pci express ATI video card, and 1 TB hard drives, Thinking this processor if it is, compatible would give the extra boost I need for my gaming activity's... Thanks in advance.