"I just know that this particular model was the OC version."
Is it a BFG? If it is just right click on your dektop. Go to display(or nVidia display). Then it will take you to a menu thing. There should be some thing called overclocking or performance. Go in there and it will have clock speeds and memory speeds. Well just keep increasing those slowly like daemon said
The Amish computer:
AMD Opteron 165 CCBWE 0551@ 2.25ghz(250 x 9) 1.45v cooled w/ Thermaltake Big Typhoon | DFI LP Ultra D | eVGA 7800GT@ 465/1110 | Sound Blaster X-Fi XtremeMusic | 2GB G. Skill DDR 500 @ 250mhz 3-4-4-8 | 80 GB SATA + 40GB SATA + 200GB IDE| 480w Thermaltake Silent purepower | Thermaltake Tsunami Dream case (Black) | Windows XP Pro |