Question ASUS Prime B450 Plus refusing to POST with correct RAM settings

Dec 16, 2019
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I recently assembled a new rig with the ASUS Prime B450 Plus motherboard, a Ryzen 5 3600 CPU, and two sticks of Corsair Vengeance LPX Black DDR4 RAM. The RAM sticks came as a kit, and are installed in slots A1 and B1 on the mobo. I've updated the BIOS to the latest version using the inbuilt update function. Freshly assembled, the system booted up just fine, but I noticed that the RAM was underclocked.

By default, the BIOS decided to run the RAM at 1.2V, 2666MHz. According to the specs on the box, the RAM should run at 1.35V, 3200MHz, 16-18-18-36. I enabled DOCP and set those exact settings, and the system failed POST twice before dropping back into BIOS safe mode.

Am I missing something? How do I get my system to boot with the correct settings?
 

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