Maybe the XET is better than the -C, maybe not. Looking at the board, BIOS and manual, they just leave off a few components to make it a -C. Maybe they have quality control problems and you have to be lucky to get a good one. I had 2 and neither worked well. I can read all kinds of stuff on the web. I can also compare a CUSL2 and a GA6OXET sitting side by side. One works great and one has warm boot problems, freezes, poor overclocking support. Features that don't work such as the 1/5 PCI. No comparison between the two. BTW, CUSL2 can run 133/100 FSB/Mem with just a BIOS setting.
Explain to me why I could run the GA6OXET 160 FSB 40 PCI 80 AGP and it worked fine. When I used the PLL/16 for a 160 FSB 30 PCI 60 AGP I would BSOD every time I tried to load Windows? I wouldn't call that a working feature. You say it worked for you. I can tell you for certain, it doesn't work on my board.
I sold the C1.0A already. I would have loved to see how it did in the TUSL2. It will be going in an MSI 815E board. I'll let you know how it works in that board early next week.
I won't get into a flame war on this. Its not my style. The board may (apparently does) work well in the right circumstance. With the Vid pin mod done, the C1.0A @ 1.4 GHz, 1.65 Vcore was working very well. The board has some flaws as far as I'm concerned.
1) 1.8 Vcore max is not enough for a Coppermine overclocker
2) Very prone to warm start problems
3) ???? C1.0A should have overclocked much better than it did. ****This is still an unknown until that CPU is run in a different board****EDIT. This is not the fault of the GA6OXET. I now see another person with similar results with an ST6.
4) PLL/16 (1/5 PCI) will not work. Causes a BSOD.
5) No BIOS support of 133/100 FSB/Ram timings
6) BIOS will not reset itself to a safe default value if overclocking settings cause a non boot condition. A CUSL2 will do this. You have to clear CMOS on the Gigabyte.
7) Requires higher Vcore than ASUS for same overclock, has warm boot problem when ASUS did not with identical CPU.
8) Others on this site seem to have issues getting past 148 FSB without Prime95 errors.
9) Only 2 rear USB ports (minor thing, but it matters to me).
I wouldn't be saying negative things about this product if I didn't think they were true. Those that followed the threads know that I really tried to get it to work well. I appreciate all the help I got from everyone including Fluid, but IMHO, there are better boards than this. If you are running < 133 FSB, the ABIT ST6 looks good. For > 133, ST6 or TUSL2 are good bets.