I haven't used too many KT133A boards yet, but they've all been stable. For that matter, in over 200 VIA KTxxx systems sold and supported in the last year, my clients haven't complained of a single stability or reliability problem that couldn't be resolved by the normal process followed by any competent system builder, namely:
- Check to make sure all cooling devices are properly installed (good contact between heatsink and chip; thin, even layer of thermal grease; no sticker, film, or paper between heatsink and chip). The HSF must of course be AMD approved. Also confirm that the PSU is AMD approved.
- Download and flash the very latest non-beta BIOS for your motherboard.
- Clean format and OS install to purge system of old apps, drivers, downloaded Windows junk, spyware, etc.
- Download and install the very latest VIA 4-in-1's from VIA's official site before anything else. This is only logical since they are essentially chipset/motherboard drivers, and the motherboard is the hub of your PC.
- Install the VIA USB Filter. If running 98SE, install MS's USB patch for that OS.
- Download and install the very latest non-beta drivers for every single piece of hardware.
- Run Windows Update and get every single service pack, bug fix, and security update there is.
- If problems persist, then one or more pieces of hardware is deffective. Simply remove all peripherals and swap out parts one by one, starting with the easiest and working your way to the motherboard: RAM, CPU, PSU, Video, then motherboard. This is Process of Elimination (POE).
The vast majority of stability problems are the result of one of these steps being skipped by an overeager or negligent builder. Following this procedure will fix any problem on any PC. A computer is only the sum of its parts, nothing more. There is no such thing as a lemon.
And since I follow these steps religiously for every system build, any subsequent problems are always the end user's fault. A clean OS install always purges whatever junk is causing it.
Modus