@ COLGeek - I read the article somewhat.
aren't they saying at least a GT240 for any kind of boost and a GTX260 for gaming boost.?
Yes, that is pretty much what the article says as quoted here, "Real added value is obtained only by using an additional GeForce GTX 260 or better". That being the case, the 8800GTS may (or may not) provide quite the horsepower the OP was looking for, especially if you consider the additional heat generated/power consumed, and whether the OP's PSU is up to the task. Still, for $25, it could be an interesting experiment. HOOAH!!!