I'lle xplain the Greyed out Multiplier.....
pretty much ALL ASUS Motherboards have the Multilier greyed out in the BIOS........i know this becasue of personala experience and reading in this and other hardware forums..
NOW....i know that the ASUS A7V133 has the ability to chaneg the multiplier in the bios (its nto greyed out) in EVERY Revision they made of that board......as far as I know, I have never seen or heard of an ASUS A7M266 board that has the Multiplier NOT greyed out in the bios.......
I'll tell you a little story......
My best freind baught an ASUS A7A266 board and was having constant stability problems, from frequent reboots to crashing in general and ASUS PC Probe would constantly pop-up saying the +3.3 +5 and +12 AND EVE VCore was fluctuating....i mena liek the +3.3 went down to 1.6, +5 went to like 4 and +12 went to 6.71...nio wordf of a lie...thats what ASUS PC PRobe reported anyways........alos, the Fan monitor would come up saying the fan stopped spinning when clearly it was fine AND the CPU Temperature spiked all the way to 138 degrees clecious when it was at a constant 39 celcious on a t-bird 800 OC'd to 1GHZ with a 133MHz FSB with a Thermaltake Volcanoo 6Cu.
Anyways......so he baught anew power supply...the 350Watt Enermax............still no dice, board and ASUS PC Probe gave the EXACT same results.....ok......i said let's exchange the board.......BTW his A7A266 was Revision 1.03......in the BIOS the multiplier was there but the option was greyed out...ok we exachanged the board.....got it with revision 1.10.....now.....the option in the BIOS for the Multiplier was NO longer greyed out....but there were also other options in the bios like SYSTEM ACCELERATION MODE, etc...
well now he can OC in the BIOS with the multipier BUT he still ahs MAJOR problems with ASUS PC PRobe, swappignt he board made no difference with PC Pobe.....so nwo he sues Motherboard Monitor 5.....worx fine...funnt hwo that boards has issues with ASUS PC Probe......4 otehr peopel i persoanlly know witht he ASUS A7A266 alos have the EXACT same issues with ASUS PC Probe.......messaed up...
anyways, my point was that you need a specific Revision of your Motherboard, or more importantly, the newer revision board has a newer revision of the BIOS on the board (im not talkign about BIOS Version, but more the Revision of the BIOS Chip itself.... =)
-MeTaL RoCkEr
<A HREF="http://www.anandtech.com/mysystemrig.html?id=13597" target="_new"> <b> My Rig </b> </A>