What causes my instability? CPU? RAM? PSU?

Hallo community,
let me start with a short description of my problem:
I am unable to get my system (see signature for details) working stable in synchronous mode: when both, CPU and RAM, are working at a FSB (or HTT) of 200 MHz, the system crashes randomly with various error messages (mostly memory related). It is possible to reduce the number of crashes by using memory slot 2 or 3 instead of 1, but the system is still unstable. The currently only way to solve this is setting the memory to 166 MHz in the BIOS. It should be mentioned that with the former motherboard (K8X800 PRO 2 from ALBATRON based on VIAs K8T800) everything was fine.
What i have already tried:
First of all, i replaced the motherboard with the AN51R from SHUTTLE - no difference, as long as CPU and RAM works with 200 MHz, the system is highly unstable. I tried various RAM sticks -A-DATA, CORSAIR, GEIL and KINGSTON- but also without success.
What i consider to try:
I feel unsure. In one of the guides it was recommended to use a PSU that deliveres at least 24A on the 12V rail - my TAGAN deliveres "only" 22A. Since i can solve my problem by reducing the memory frequency, i do not believe that replacing the PSU will help. What remains ist the CPU: i own a CLAWHAMMER stepping and i know well that the newer NEWCASTLE stepping uses a revised memory controller. On the other hand, this CPU did fine while using a different chipset. As i told - i feel unsure.
Any help is highly welcome.
Thank you in advance,
JePe

One stick (512 mb) in currently slot 3 - since this worked best for me. And no, i did nor ran memtest until now, since ... i do not own a floppy drive . Beside this, i really cant imagine that all memory sticks i tried had the same weaknesses.
Greetings,
JePe

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