unfortunately, i don't think you could flash the bios with another one... but you may have the FSB clock option, you could bump it a little, generally the 775 socket overclock well (not as much as 1155 but you could reach maybe 2.7-2.8 without vcore adjust...) your motherboard support fsb 266, give it a try it will bring you to 2.93ghz (do not forget to adjust your memory multiplier to the lowest possible ex: 667 cause it will raise with the FSB) my q6600 is 2.4 and go to 3.12 without voltage stable and my E6500 (2.93ghz) went up to 3.5 without voltage adjustment and completly stable (on a g41 board)

If your a beginner in overclock, i'd suggest you to go with step of 10mhz first (ex: 200 to 210 to 220) test between each step (you could skip the first one) but when you reach like 230-240 test to be sure it's completly stable (ex: you could reach 3.X ghz but it will crash in game) when you find instability, back off like a 10 mhz and it should be rock solid for life cause we don't put more voltage in it...

for stability test, i'd suggest that you run prime 95 like an hour or so... when it crash downclock by 10 and test for 10 hour to be sure (if it crash downclock again) if it pass 10 hours nothing would crash it later...

I am a novice overclocker and the motherboard will not let me touch anything involving the CPU in the bios. Is there ANY way to overclock on this board at all?

on the G series board if you don't have a FSB option, i don't think you can overclock... on my G41 i only have FSB and memory option, no voltage or FSB termination, etc... in simple terms G board is really cheap and only for basic use... when i bought my G41 board i was very disapointed about that, that was the first board i buy that can't overclock well... (ex: my Q6600 was at 3.1ghz and with my ASUS formula and my gigabyte p43 i reach 4ghz easily and could reach a max of 4.46 ghz with the formula when i was benching)

How much would a P43 motherboard cost me and where could I buy one, also, what about the X series chipsets?

you have ddr2 so the X is not a option but for p43 unfortunately i think it's no more in store... i think all that we can buy is fu*** cheap chipset to replace a defect mobo... you could try ebay, maybe some of them are available... (but if you want a decent mobo go with p45 chipset (add sli crossfire and more overclock headroom P43 is limited to 415mhz in general and i was very lucky to have one that could reach 450 but no more my formula i was at 558mhz of FSB)

(i only buy a p43 to replace my defect formula when it was in mail... but never reformatted so i always run with the gigabytes p43-es3g)

I could always buy DDR3 RAM, it is cheaper per GB and it gives it more future proofness. CrossFireX would be AMAZING! I could get another Radeon HD 3870 X2 and have a quad GPU system or buy another 9600GSO for $15. Thanks for the help and suggestions!

don't forget to change your processor, even at 4ghz it bottleneck your card i have a core 2 quad a 4ghz and it bottleneck a single GTX560OC DCII (950mhz) my friend's i5 got like 15-20fps more in every game with a 560 stock (810mhz)