The old motherboard refuses to recognize the new RAM.
The old motherboard refuses to recognize the new RAM.
I suspect the largest sticks allowed are 2GB, which suggests 2 x 4GB won't fit. You might need 4 x 2GB or 2 x 2GB. There seem to be threads suggesting 4GB modules could work, while Dell only mentioned 8GB (like 4 x 2GB) because that was the maximum available at the time. If you can access the BIOS, consider lowering the FSB speed from 1333 to 1066 or even lower to 800MHz. Alternatively, check if a single stick is sufficient. Always test each stick in every slot to rule out issues with motherboard or CPU.
Non-ECC RAM uses regular memory chips that are vulnerable to errors, while ECC RAM includes error correction to detect and fix these issues automatically. Choosing between them depends on your needs for reliability and performance.