The fact that you can run benchmarks indicates you have a stable system - but the low benchmark results seem to indicate that your system may be set up with the lowest safe default BIOS settings.
First step would be to examine your BIOS settings - or, if you don't understand BIOS options, study up a bit.
Your BIOS safe default settings, for example, may have your CPU speed up as 11X100MHz=1100MHz. Similarly, your RAM might be set with safe defaults such as 133MHz memory clock speed with command rate 2T. These safe/low-performance default settings are intentional, since they stress no system elements and assure that your motherboard will easily boot up first time out of the box.
Hope this helps!