I got the following error from my message log.
[Hardware Error]: Northbridge Error (node 0): DRAM ECC error detected on the NB.
The error message means that there is an error in your RAM. But it was corrected because you are using error-correcting RAM. If you are getting a lot of these errors in your Messege log, then it means that you have a faulty RAM stick.
memtest won’t detect it because the error is corrected before memtest reads that bad memory. if you want memtest to detect the error, you have to turn off ECC in your BIOS settings.
