hi, i buy asus p5b vm-se mother board with 2.2 core 2 due processor and 2 GB ram 800MHz buss. when i set dram frequency to auto or 800MHz my PC freeze while playing games and watch movies using windvd 8. but when i set dram frequency to 667MHz every thing is OK why? anyone having this problems too?

If you have a 2.2GHZ (11x200) C2D, you must have the 4MB L2 65nm E4500 with 200MHz -- 800MHz QDR -- Front Side Bus. Anyhow, what type of RAM do you have in the machine & why the heck are you setting the memory to DDR2-800 (400MHz)? The optimal FSB:DRAM ratio should be 1:1, this simply imply that your RAM be clocked at 200MHz (DDR2 400MHz) so as to match the CPU's bus speed. There isn't really a compelling reason to clock the RAM asynchronous way faster than the CPU bus. In some cases, doing this could be at the expense of the overall system performance or even result in stability issues. On that machine, you don't need anything beyond DDR2-400 (200MHz) PC2-3200 memory. Even if you planned on overclocking your E4500, your motherboard is not a solid overclocker & I don't see what good some DDR2-800 (400MHz) PC2-6400 will do for you. It is highly unlikely that you can or will ever be able to run the CPU at 300MHz, let alone 400Mhz (1600MHz QDR) If you are lucky enough (and I even doubt it) that the motherboard is able to let you clock the CPU at 300MHz, that is still not a required excuse to run the RAM @ 333MHz or DDR2-667 speeds. Bottomline: If you are running your E4500 at stock speed, you need to downclock your RAM from the current 333MHz to 200MHz in order to preserve a synchronous CPU/DRAM ratio of 1:1 vs your current 5:8 ratio, although, if the system appears to be stable at the 5:8, you can maintain it & observe the system to ensure you aren't taking a performance hit.

I love sarcastic techy talk! You could just ask him to upgade his processor in order to use his ram at its promoted MHZ. Take your E4500 back or put it in another system. This board has many overclocking features and is rated an A+ by your local PTA. Don't hesitate to skyrocket the performance of this baby by adding no less than the E6600 processor and DDR2 800 Ram. Kick it up a notch with at least having the PCIE space occupied by the company of at least an nvidia 8600 graphics card... cheap now... now you have seen the light! Game on... movies on... Ratio on... Bow...

Thanks for ur nice comment...

Yeah! Take the E4500 back after already using it for a quarter ... that's real funny. The problem is not so much the CPU as it is the motherboard, I have an E4300 that I was able to overclock to 3.2GHz using the GA-965P-DS3 from Gigabyte. At this speed, the E4300 flat-out outperforms the E6600 at stock speed. And an E4500 paired with a decent motherboard might even overclock to 3.4GHz or a tad more. So, why would I suggest getting a faster CPU with the less than stellar G965 motherboard. Jabbering Idiots: Everywhere You Look!