What model Chaintech motherboard? There're a lot of them.
What type and speed of RAM? You only provided size.
Brand, wattage and (if possible) amps on +12V rail power supply.
Where was this RAM speed reported? In BIOS? From a utility program?
I might be way off base since we have insufficient information but as pure speculation what I'm trying to find out if you might have mistakenly overclocked your RAM to the point where it was unstable and your system shut down. For example, if you have DDR 400 (PC 3200) your BIOS or utility program such as CPU-Z should report the RAM speed as 200MHz instead of 400MHz because DDR is double data rate. Double is the key word here. So if the BIOS is reporting 333MHz, it is still overclocked to 666MHz. But as I said, I could be all wrong once we get enough info.