Could be a couple of issues.
If your RAM sticks are not identicle some boards will have problems.
Or one of the two could be defective and the system will only run as fast as the slowest RAM installed.
Too see if one of the RAM sticks or slots are bad, set the BIOS to default, boot system with only one RAM stick in slot 1, then move it to slot 2, repeat with second RAM stick. If they both run at 400mhz in both slots, then for some reason the sticks are not compatible.
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