Max FSB limit on P5B, with BIOS 309 and 509, is 650 Mhz: I said 266 and 400 to do an example :)
I use "only" 400 FSB because it offers good performace and no problems (and I have 667 Mhz RAM running at 800 Mhz, it is already overclocked enough)
If u are planning to work with 400 FSB, 800 Mhz...
I flashed my P5B (vanilla) with USB flsh drive: there is an utility in the BIOS called EZFLAH, it can load new BIOS from floppy or from an USB device, as u want, u don't need bootable floppy
There is a P5B DeLuxe not-Wifi, but it is not available in some countries
1. No dividers: with FSB 266 u can choose AUTO/533/667/800/889/1067, with FSB 400 u can choose AUTO/800/1000/1200/1333/1600
2. Max is 2.1 volt, it is enough for my Corsair 667 Mhz to work at 800 Mhz with FSB 400
3. I don't remember, maybe 1.7 volt with Conroe, but 1.225 volt (1.17 volt...
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