|As I told you in your other post, your Celeron only has 512K L2 cache & that hinders the performance. Later model Pentiums have 2MB L2 cache, Core 2 Duos have as much as 6MB. You have a weak CPU no matter how you slice it.|
Your overclock settings are incorrect. For best performance, the CPU & RAM should either run at 1:1 or 1:2 ratio. That ratio is based on frequency, not DDR or QDR ratings. Right now, you have the CPU at 250MHz frequency & the RAM at 333MHz. That gives you a ratio of 3:4 (250:333). You either need both running at 250MHz or both running at 333MHz. 333MHz is the obvious choice because it is one of the "standard" settings.
Shoot for 3.0GHz (9 x 333MHz) with the RAM running in sync at 333MHz (667MHz DDR). It may be necessary to increase the CPU voltage to stablize the overclock. Make sure to lock the PCIe at 100MHz & to disable all Spread Spectrum settings (if there are any). There may also be some sort of RAM divider setting that will need to be adjusted.