Looking at HP forums found this:
"The HP9795C has an HP OEM ASUS-P4T motherboard with Intel 850 chipset."
The manual is here:
http://dlcdnet.asus.com/pub/ASUS/mb/sock423/850/p4t/p4t-107.pdfTake a look (at page 14 you should see the jumper).
This all assuming is the same motherboard... Don't know how many modifications HP made... good luck!