Ok, DP, i'm going to take a stab at this, but i'm NOT 100% sure.
Assume: MSI K7T 266Pro
(Not K7T 266Pro2, K7T 266Pro2-A, K7T Pro, K7T Pro2, or K7T Pro2-A)
MSI K7T 266Pro is MS-6380 , same as mine except mine is Ver. 2
(I have K7T 266Pro2-RU, MS-6380 ver 2.0, NB=552BGA SB=376 BGA)
You also have 552 BGA northbridge, but is a VT8366 chipset.
You have 376 BGA southbridge VT8233 chipset
We have the same southbridge 376 BGA (VT8233 chipset), so let's look at the northbridge.
My northbridge is VT8366A and i have a Via KT266A chipset.
I think you have Via KT266 chipset
(Because you don't have the "A" in your VT8366, although it doesn't state it on the MSI website and is why i am not completely sure)
K7T 266Pro
http://www.msi.com.tw/program/products/mainboard/mbd/pro_mbd_detail.php?UID=27&MODEL=MS-6380
simple? lol
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You're good for all the Palominos with o/c to 164 FSB.
You can also run T-breds if you:
1. Update bios to 3.6 or 3.7 (or 3.74 beta)
2. Remove (C37) condensor from the motherboard
3. Unlock the chip (L3 #5) (If you want 12.5 and lower)