Assuming you have PC3200 memory, you would have to set the CPU multi to 9, the LDT multi to 4, the HTT to 245, and the memory divider to 166 (5:6). These settings will OC your CPU to 2.2GHz and keep your RAM at DDR400. And you'd be VERY hard pressed to get a 165 that didn't do more than 2.6GHz, let alone 2.2.