I decided to upgrade my Dell Precision 7710 (service tag: <Service tag removed>) from non-ECC memory to ECC memory. The laptop was originally configured with 8Gb of non-ECC RAM (2x4GB 2133MHz Hynix p/n HMA451S6AFR8N-TF). After replacing the original memory with ECC(2x16GB 2400MHz Crucial CT16G4TFD824A.18FA1 p/n 18ASF2G72HZ-2G3A1 ) the laptop does not boot. Status LED blinks 2 times amber and 5 times white. The cycle repeats few times and the computer powers off.
I'm using only primary memory banks (both of them are working fine with original sticks) and the newest available BIOS – 1.9.5 .
I've tested several configurations and the only one that works is mixing an old 2133MHz non-ECC stick with a new 2400Mhz ECC stick. This suggests that BIOS is not able to handle scenario when only 2400MHz memory is installed.
Are there any chances that this will be fixed by BIOS update?
The same issue has been reported for Dell Precision 7510 (with valuable technical data) -> http://forum.notebookreview.com/threads/precision-7510-weird-problems-with-crucial-16gb-ram-ecc-stic...
I don't expect the 2400Mhz memory to run at the maximum speed. It should get downclocked to the speed supported by the motherboard - 2133Mhz. As far as I know this is the standard behaviour for all motherboards.