I installed 4 GB PC3-12800 DDR3-1600 RAM in slot 1 in my HP Compaq 8200 Elite SFF PC, the pc display error message 201 on booting,I enter F10 setup, the BIOS read the ram as 4 Gb with PC speed as PC3-1333, then it offer to boot with pressing F1,it booted with no problem and look working fine.
I replaced this PC3-12800 ram with 4Gb PC3-1333 DDR3-10600 the PC booted with no error message.
I installed this PC3-12800 in slot 3 (Black) to make PC run in dual channel mode with the 4Gb PC3-1333 in slot 1, the PC display error message 201 again and still booted up and look works fine.
I removed the PC3-1333 4GB ram from slot 1 and install 2 X 2 Gb PC3-1333 DDR3-10600 ram in slot 1 and 2 to make PC run in dual channel mode with the PC3-12800 installed in slot 3, the pc booted normally with no error messages.ram reading total of 8Gb and PC run fast and flawless.
what the above means in term of error if the RAM PC3-12800 is faulty or is incompatible?why it works in slot 3 but not in slot 1? why it works with the 2 x2 GB ram but not with the 4 Gb PC3-1333 ram?
Any help is very much appreciated.
thank you.