What is the best cpu I can upgrade to?

Hello,
I have a gateway LX 6200 computer that currently has the Phenom 9500 init. It's a quadcore 2.2GHz CPU and I've been told that I don't see an increase in frame rates in the games that I play betwen my old Nvidia 8800 GTS and a new Nvidia 9800 GTX because it's likely that my CPU is bottlenecking and a upgrade of my CPU should show me performance increases with using either video card.

With that in mind, Im wondering if anybody knows if it's possible to upgrade the CPU in this gateway computer and if so, to which CPU can I upgrade to?

Thanks

http://www.newegg.com/Product/Prod [...] 6819103472

or better

http://www.newegg.com/Product/Prod [...] 6819103471

Do you have any idea what make of motherboard is in that, it will have a name followed by 780G I think,
but also Have you considered that you may ahve to upgrade your PSU, I believe its only a 400w in that machine

I already have an upgrade PSU, it's a thermaltake 750watt toughpower to accomodate the 8800 video card as the original stock psu use to make an awful noise when I installed the 8800 in this computer, like it was straining electrically.

Hmmm, flashing the bios might be a problem, I've yet to find any updates for the gateway bios so far that I've looked since I was looking to flash the bios originally so that I could attempt to overclock the current CPU just a wee bit which the bios currently doesn't support as far as I can see.

According to Everest the main board is: (whether it's accurate info I can't say, it is what everest reports for the mainboard)

Field Value
Motherboard Properties
Motherboard ID 64-0100-000001-00101111-080608-ATHLON64$87IP011G_RS780 SERIES 87IP011G 080608
Motherboard Name Gateway RS780

Front Side Bus Properties
Bus Type AMD K10
Real Clock 200 MHz
Effective Clock 200 MHz
HyperTransport Clock 1800 MHz
North Bridge Clock 1800 MHz

Memory Bus Properties
Bus Type Ganged Dual DDR2 SDRAM
Bus Width 128-bit
DRAM:FSB Ratio 12:6
Real Clock 400 MHz (DDR)
Effective Clock 800 MHz
Bandwidth 12800 MB/s

Upgraded earlier I think.

But don't worry, it shouldn't require a flash. Reviews for that computer, people are saying they just popped in a P2 and it worked fine.