p4b533-v with ddr333

[doquinn]

Just bought this board. I am newbie to overclocking and have no idea what settings I need to change to overclock the fsb to 166. I changed a bus setting to 166 and rebooted but my computer wouldn't boot back up. So I removed the battery and set it back to 133. I have read articles on THG that say the p4b533-v can use ddr333 how would I do this exactly. The asus manual doesn't provide much help. Thanks.

 

[cimurray]

Assuming you have got memory rated at DDR333 or better then proceed as follows:

1. When you switch on enter the BIOS (press DEL key).
2. Go to the "Advanced" menu.
The next step depends which version of the BIOS you have:
3a. Set CPU external frequency to 133.
4a. Set CPU memory frequency ratio to 4:5.
OR
3b. Set CPU external frequency to 133.
4b. Set memory frequency to 333.

5. Go to Exit then save new settings.

Either way you will be running your memory at DDR333.

 

[doquinn]

don't i want the cpu bus to be 166 (333 / 2)??

 

[rubikian]

Your CPU FSB is 133MHz quad pumped to 533MHz. Setting your FSB to 166 is way too high for your CPU and it won’t boot. The mobo chipset will help you to set the divider or you set in the Bios for your RAM (which the speed is 166MHz). Your CPU does not communicate with the RAM in the same bus but through your mobo chipset.

 

[cimurray]

You probably DO want your mobo to run at 166FSB but this one is not very good at extremely high speeds and you would likely end up with an unstable system. That is why mobo manufacturers put memory dividers into the BIOS - it allows users to make their memory go faster without risking instability with other system components.

If you set your BIOS to 133MHZ then data runs at this speed between the CPU and the memory (quad pumped as noted above). This gives a data transfer rate of 533MHz (133x4)
Your memory would also run at this speed if you left the memory divider on the 1:1 setting. However, as your memory passes data at both the peak and trough of each pulse you effectively get a transfer rate equivalent to twice the speed of the memory - in this case 266MHz (2x133)referred to as DDR266.

By using the 4:5 memory divider you increase the speed of your memory to 166.25MHz(133x(5/4)). As the memory is still transferring data on the rise and fall of each pulse the effective rate is twice this ie. 333MHZ or DDR333.

I also have this board and run my processor at 156FSB which gives me DDR390 using the 4:5 memory divider and the whole system is 100% stable.

Good luck with yours