EPOX 8K5A2 very unstable when Dimm slots are full...

[Amputater]

OK, here is the story...

Current rig set-up
************************************************************
Epox 8K5A2
AMD XP2100+
Dimm (memory) slot 1 - Samsung CL2.5 PC2700 512MB stick (Double-sided)
Dimm (memory) slot 2 - Samsung CL2.5 PC2700 256MB stick (Singel-sided)
Dimm (memory) slot 3 - EMPTY

This set up has been rock soild for the past 6 months
************************************************************

I just got 2 sticks of Kingston from Newegg, and these are CL2.5 PC2700 512MB (Double-sided) also, exactly the same as my 512MB Samsung stick.

Here is the fun part, I removed the 256MB stick from Dimm slot 2 and installed the Kingston 512MB. I then installed the second Kingston stick in the empty Dimm slot 3. Now there is a total of 1.5GB of ram. Powered on, and frozed instantly. Ok, then I reset and after about the 4th try, it finally booted into Windows, BUT, less than a minute later, PC restarted itself without any warnings!!! What the??

Then I emptied the Dimm slots and did the following...

Dimm 1 - Samsung
Dimm 2 - Kingston
System booted, stable and rock solid


Dimm 1 - Kingston
Dimm 2 - Samsung
System booted, stable and rock solid


Dimm 1 - Kingston
Dimm 2 - Kingston
System booted, stable and rock solid


Dimm 1 - Samsung
Dimm 3 - Kingston
System booted, stable and rock solid


Dimm 1 - Kingston
Dimm 3 - Samsung
System booted, stable and rock solid

Dimm 1 - Kingston
Dimm 2 - Kingston
System booted, stable and rock solid


Now, whenever I try to install all 3 sticks together (regardless of the combination) system would either not boot at all or crash about a minute later. What is up with that? Is there somehting wrong with my Epox board? or some of you guys are having this same problem?


Any advice would be appreciated,
Amputater