I have a MSI albacore, is the performance boost worth the extra cost on the 185? I might have to do a few more bit jobs over the summer to pay for these upgrades
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Honestly, I would just save money for an AM2+ Phenom system for later this year. I upgraded from an X2 4200+ running at 2500mhz and I dont think I'll see a big noticeable difference with this Opty 185 until I get over 3ghz. If youre going from an X2 you already have to an Opty the performance jump isnt that huge unless you plan on a lot of overclocking.
In your case though, you would notice a HUGE difference going from a single core to dual core so for you it should be worth it at today's prices.
Albacore? Is that an HP system or an OEM MS-7093?
If it is, you can forget OC'ing and are probably wasting your time unless you can get a smokin' deal on a high clock speed 939 (4800+, etc).
Be totally pointless to upgrade to a 3800 X2 or Opty 170 and run stock.
You'd be better off buying a new board, ram and C2D. If it's an HP Pavilion, any microATX board should fit in there and the current PSU will work as well, but keep in mind most mATX boards have little in the way of OC'ing options. So a new case may be a good idea as well