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FalconFly
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*ugh*
As far as I know, none of them natively support even HT yet, let alone SMP.
(Quake 3 is an exception, but SMP support was always buggy and was therefor disabled by default inside the Engine)
SMP support is just being carefully begun to being advertised for "future Gaming" by leading technology creators, and even for the forseeable future they predict only a very slow start for using it. AI and other less relevant tasks are planned to being made Multithreaded in the future, but that's still a long road ahead, no single sign of that exists in today's Games, all absolutely Single-Threaded (with Q3 being the only odd exception within the entire last 5 years with its broken and abandoned SMP support plans).
In such high Resolutions and Quality settings, CPU power becomes irrelevant anyway, it's clear that only and exclusively your Video Card is the limiting factor.
The only SMP accelleration found at all would be the common SMP Extension inherent to OpenGL, but that alone doesn't mean alot either in such extremely VGA limited games.
DirectX AFAIK has no SMP support whatsoever (yet), so your performance improvements likely come from one CPU having unlimited access to both RAM busses over the Hypertransport link or some other really odd System abnormality (you'd have to check with a CPU load dagram though)
Benchmarks with 2 CPU's were extensively done on many Systems and the common outcome still was (and is) that Dual CPU Systems are useless for most Games. In fact, several Systems tested actually yielded a small slowdown over Single CPU tests due to SMP overhead.
The only time your figures would make sense, if you were to perform then in Software Rendering (and even there your reported gains are difficult to achieve outside of development simulators)
Otherwise, if you have a significant overload of background tasks, those would be taken by one CPU, while the other now can concentrate on running the Game.
If you want to benchmark CPU's, the old common rule applies :
Benchmark in lowest possible Resolution and low Quality settings. Anything else invalidates your benches, as soon as the Video Card (or other component) becomes a bottleneck even for one split second.
(Those benches included much more powerful CPU's as well as much faster Video Cards, the result remained the same)
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Sorry to disappoint you, but there's something "different" (diplomatic word for 'screwed up') in your System configuration that prevents one CPU from delivering its full performance when used single.
Note that if you use Win2000, this OS becomes highly unpredictable if installed in SMP mode, and then left running with only one CPU.
Unless you're planning to perform extensive manual work on its deepest Structure (the only way to manually fix it), it's simply known as absolutely mandatory to re-install it from scratch when moving to Single CPU again, if you don't... funny stuff can be expected.
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