Confused by BIOS changes.

[MistaTastyCakes]

The P4SDX has a new BIOS! I have this board and I have a quick question...

Improve AGP card compatibility
Fix failed to operate under CPU 166/DDR333 memory frequency when using FSB800 CPU.
Fix failed to operate under CPU 133/DDR440 3:5 special ratio.
Update new INTEL 478 pin CPU Microcode to support new CPU.
Fix Win2000 system resumed for "S4" USB1.1 storage device, ZIP/MO/LS-120 lost its function.
Fix show dual channel(64BIT*2) when only one DIMM was installed.

The second line is interesting.. does this mean the mobo supports the new 800mhz FSB processors or what? Or is this basically meaning someone can now put an 800mhz FSB processor in this mobo, overclock the system to 166mhz FSB, and it'll now work?

If so.. LAME No point in o/cing that high w/o an AGP/PCI lock.

 

[Lord Evermore]

I believe it is so that you can overclock the bus to 166 using an 800MHz CPU, since the system normally wouldn't even recognize that type of CPU. Of course, it'd be a severely underclocked processor. A 2.8GHz would only run at 2.3GHz on a 667MHz bus. Can't imagine why you'd pay the extra for a P4-C in order to use it at a slower speed.

 

[Budman]

No I think they meant that if you use a 800fsb cpu at 200mhz you cant run your Ram with a devider at 166mhz.

 

[Lord Evermore]

Well, "CPU 166/DDR33" certainly doesn't look like 200MHz bus. As I read it, they made it so that the system will function when you set a 166MHz bus when using a P4-C. There's no mention of any divider that makes the RAM slower than the bus, only the other way around. The second line indicates they made it work when you overclock the memory as high as 440MHz when you use a 533MHz bus (probably wouldn't go over 400MHz before).