Socket 775 - Worth an upgrade?

[Uther39]

You would be better off served by a quad core like one of these
http://www.ebay.co.uk/itm/Intel-Core-2-Quad-Q6600-SLACR-2-4ghz-8MB-1066-NR-/260999893885?pt=UK_Motherboards_CPUs&hash=item3cc4ce537d#ht_500wt_1413

http://www.ebay.co.uk/sch/i.html?_sacat=See-All-Categories&_from=R40&_nkw=q6600&_sop=2