As far as Opteron vs X2, the Opteron is designed as a server CPU. Thus, it gets more comprehensive testing at the fab plant and is likely to be more robust. Also, and dont quote me on this because I lost the link, the Opteron has a more streamlined built-in memory controller. All things being equal, for example a 4800+ running at 2.6ghz and an Opteron 185 running at 2.6ghz, Id pick the Opty...and I did.
I use all AMD Dual Core Optimizer and other related drivers, including the Microsoft one. All I know is, Crysis is Dual Core coded and does indeed use both cores when running. If you see any patches, AMD or otherwise, Id grab them and install them. If there were any conflicts, as opposed to simple redundancy, Im sure we would know about it by now.
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