Yeah, it will probably be bottlenecked expecially at your resolution.
At lower resolutions, more demand is put on the CPU to quickly feed data to the GPU.
If you can, try to get some more speed out of the CPU.
Not really as bad as it sounds, though.
It just means you will be able to turn up more eye candy with out a performance hit
The P4 is already overclocked from 2GHz , board doesn't allow for custom voltage settings.
I might be getting a 2.4GHz P4 and overclocking it to 2.6GHz+ depending on how it does with stock voltage. Will this help with those games at those resolutions?
I would not bother upgrading a P4 to another P4... For low res gaming though you should be fine with that combo. That P4 needs to be put out to pasture in all fairness.
No, defiantly not.
For that much you can get a low end Motherboard and Core 2 CPU.
That will defiantly blow the socks off even the fastest (and overclocked) P4 and it is highly overclockable.