Hey, I have a7a266 asus, want to know anybody who running 2600 or 2400 xp @ 266 fsb with no problem?? I'm looking forward to buy t-bred 2600 for my mobo but worried I'm risking, I already updated my bios. any help?

According to Asus's website, it should run fine so long as you've got PCB revision 1.10 or later.
Thoroughbred 2600+ chips for 133/266MHz FSB are rare and expensive. A 2400+ chip would be much easier to come by.

Has anyone managed 166/333MHz FSB with this motherboard? It might take a Barton then.

If ya haven't seen it already there is some discussion in this thread that might interest you:
http://forums.amd.com/index.php?showtopic=21473' ">http://forums.amd.com/index.php?showtopic=21473

Same motherboard!

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AMD Phenom X4 9750 / ASUS M2N32 SLI Deluxe / 4 x 1GB Corsair PC6400 / 2 x 250GB Seagate SATA II - RAID 0 / 2 x Gainward Bliss 7950GT 256MB / Creative Sound Blaster X-Fi XtremeMusic / Plextor PX760-SA DVD-RW / Sony IDE DVD-ROM / Antec TruePower Trio 650W

AMD Phenom II X4 965 / ASUS M4N82 Deluxe / 2 x 2GB GSkill PC2-8500 / 2 x 160GB Seagate SATA II - RAID 0 / 2 x Gigabyte GTX275 896MB / Creative Sound Blaster X-Fi XtremeGamer / Pioneer SATA DVD-RW / Corsair TX 750W