Hi there, I'm an engineer (evidently the wrong kind) and novice PC builder hoping for help with what I expected to be a simple upgrade:
Configuration:
Motherboard: MSI X99S Gaming 7
CPU: i7-5820K
Boot Drive: Samsung 850 EVO
RAM (Config 1): 16 GB (4x4) DDR4, 2400 MHz, 1.2V [ADATA Something Offbrand]
RAM (Config 2): 32 GB (2x16) DDR4, 3200 MHz, 1.35V [Corsair Vengeance LPX]
RAM (Config 3): 32 GB (2x16) DDR4, 2666 MHz, 1.2V [Corsair Vengeance LPX]
Background:
I put this PC together several years ago without any problems, though I've always had some boot-up strangeness. With RAM Config 1 I basically always boot to a black screen with "A2" in the bottom corner. Either power cycling or hitting reset will allow the computer to boot normally to Windows.
Upgrade:
I recently tried moving to RAM Config 2, but the computer will not boot. Instead, it powers on for a few seconds and powers off, without getting as far as the option to go to BIOS, or even far enough to send a video signal to the monitors. Swapping back to Config 1 resumes the previous behavior of the computer, with the annoying double-power-cycle requirement but otherwise being fully usable.
With RAM Config 1 installed I attempted through overclocking tools (both in Windows and in BIOS) to manually set the DIMM Voltage to 1.35V from Auto, in case Auto wasn't working for some reason. This did not improve the behavior once I switched back to RAM Config 2.
I checked the specs for the motherboard, and while it lists compatibility with a wide range of specific RAM frequencies up to 3333 MHz, it does not specifically list 3200 MHz. For this reason, I traded in the 3200 MHz stuff for 2666 MHz, RAM Config 3. Config 3 is also 1.2V RAM, the same as my previous successful configuration. Unfortunately, Config 3 behaves identically to Config 2.
Configuration:
Motherboard: MSI X99S Gaming 7
CPU: i7-5820K
Boot Drive: Samsung 850 EVO
RAM (Config 1): 16 GB (4x4) DDR4, 2400 MHz, 1.2V [ADATA Something Offbrand]
RAM (Config 2): 32 GB (2x16) DDR4, 3200 MHz, 1.35V [Corsair Vengeance LPX]
RAM (Config 3): 32 GB (2x16) DDR4, 2666 MHz, 1.2V [Corsair Vengeance LPX]
Background:
I put this PC together several years ago without any problems, though I've always had some boot-up strangeness. With RAM Config 1 I basically always boot to a black screen with "A2" in the bottom corner. Either power cycling or hitting reset will allow the computer to boot normally to Windows.
Upgrade:
I recently tried moving to RAM Config 2, but the computer will not boot. Instead, it powers on for a few seconds and powers off, without getting as far as the option to go to BIOS, or even far enough to send a video signal to the monitors. Swapping back to Config 1 resumes the previous behavior of the computer, with the annoying double-power-cycle requirement but otherwise being fully usable.
With RAM Config 1 installed I attempted through overclocking tools (both in Windows and in BIOS) to manually set the DIMM Voltage to 1.35V from Auto, in case Auto wasn't working for some reason. This did not improve the behavior once I switched back to RAM Config 2.
I checked the specs for the motherboard, and while it lists compatibility with a wide range of specific RAM frequencies up to 3333 MHz, it does not specifically list 3200 MHz. For this reason, I traded in the 3200 MHz stuff for 2666 MHz, RAM Config 3. Config 3 is also 1.2V RAM, the same as my previous successful configuration. Unfortunately, Config 3 behaves identically to Config 2.
Last edited: