RAM Compatibility Dillema

[ragtop]

After trying to troubleshoot some stability issues for the longest time, I have come up with a dillema. Hopefully you can follow this long-winded explanation:

I have four motherboards:
-Soltek with KT266a chipset
-ECS with KT266a chipset
-Leadtek with SIS 735 chipset
-Shuttle with KT333 chipset

I also have four sticks of 256MB PC2100:
-one Mushkin
-one old double sided Kingston
-two new single sided Kingston

The Mushkin RAM works fine in all four boards. The three Kingston sticks work fine in the two KT266a boards, but they fail in the SIS 735 board and the KT333 board. By "fail", I mean that they produce errors in Memtest86, which are confirmed by instability when running games or 3D Mark demos. (In all cases, I'm running stock speeds and RAM timing by SPD)

So what do I have going on?? Three bad sticks of RAM?? Two bad motherboards?? or a strange series of incompatibilities??

Also: are there any changes you can make by using manual RAM settings that will reduce memory errors and improve stability?? (I'm more concerned with stability than getting the last ounce of performance from the system)

[Darknyt]

I have used a board using the SiS 735 chipset, one known problem with the particular board that I used (ECS K7S5A) was that if you didnt have a stable power supply(clean current, low noise), the board would function properly. It sounds like the KT333 board and the SiS board just dont like the particular Kingston RAM you are using. It happens. Doesnt mean that the board or the RAM are defective, just mean that the boards dont like that particular RAM.