Originally posted by: tornadog
I have an Opty 165 running on a MSI NF4 board with 2 GB DDR Ram. While the thing has been serving me pretty well, I kinda feel left behind with all this core 2 duo and quad core talk.
I would hope the point of dual core and quad core processors is to actually use them, not tell your friends my 4 cores are > your 1 core (unless you have self-esteem issues and need to prove prowess by having a faster computer). So don't "feel" left behind

If all you do is play videogames and do not runny many tasks in the background (like video encoding, SETI/Folding @ home while playing a game, or Photoshop filters, etc.), then I would simply overclock your processor and you won't be giving up that much in terms of performance. Opteron's should hit 2.5-2.6ghz. At 1.8ghz though it does limit the speed of your 8800GTS somewhat (esp minimum framerates). Of course in some games C2D is just more efficient so even overclocking won't help you. But that depends on the games you play.
For instance,
In Supreme Commander a single core processor is just not enough. Even Dual Core X2 processors at 3.0ghz are significantly slower.
In games like
call of duty 2 and quake 4 Athlon 64/X2 is more than sufficient.
If you think you'd benefit from dual core, I'd try to upgrade to an X2 chip as doing a complete overhaul isn't worth it for you. When I upgraded to C2D I went from P4 2.6@ 3.2ghz single to C2D 2.13@ 3.4ghz which is more than double the speed increase for me. But in your case dual core X2 would give best bang for the buck and then later you can do a complete system overhaul to DDR2 or DDR3, etc.