u/CertainBattle2521

I just built a PC for my nephew. ASRock B650M-HDV/M.2 (BIOS 3.40), Ryzen 8400F, Patriot Viper 16GB DDR5 6000 CL30 (9DE00412-VEB516G6030W).

It only works at base 4800 CL40 AUTO. I tried EXPO 6000 CL30, EXPO 5600 CL36, XMP 6000 CL30, XMP 5600 CL36, and manual settings for 5600 CL40 at 1.35V, and none of those boot. EXPO 5600 CL36 reboots but falls back to 4800, everything else looks completely dead. I let each “dead” configuration train for at least 15 minutes, probably closer to 20. Nothing. The only way to get it working again is clearing CMOS and going back to 4800.

This is new for me. I’ve never had RAM issues like this on AM5 with either manual tuning or EXPO/XMP profiles. This is my fourth AM5 build. I have my own Ryzen 7600 with the exact same motherboard and RAM, except my kit doesn’t even officially support EXPO (Intel XMP only), and it runs 6400 CL32 without issues. I ended up settling at 6000 CL30 anyway. Same story with a 7800X3D build I did for a friend, and another one with a 9700X. I also had random 6000 CL30 kits work first try on this same motherboard.

The only difference in this build is that we’re using a single 16GB stick for now, since we all know why. He’ll add another stick later if prices become reasonable again. All my previous AM5 builds were dual channel. (single dimm is in the slot further from CPU)

Any ideas what could be causing this? Is it just that the 8400F memory controller is that bad, or am I missing something obvious?

I just built a PC for my nephew. ASRock B650M-HDV/M.2 (BIOS 3.40), Ryzen 8400F, Patriot Viper 16GB DDR5 6000 CL30 (9DE00412-VEB516G6030W).

It only works at base 4800 CL40 AUTO. I tried EXPO 6000 CL30, EXPO 5600 CL36, XMP 6000 CL30, XMP 5600 CL36, and manual settings for 5600 CL40 at 1.35V, and none of those boot. EXPO 5600 CL36 reboots but falls back to 4800, everything else looks completely dead. I let each “dead” configuration train for at least 15 minutes, probably closer to 20. Nothing. The only way to get it working again is clearing CMOS and going back to 4800.

This is new for me. I’ve never had RAM issues like this on AM5 with either manual tuning or EXPO/XMP profiles. This is my fourth AM5 build. I have my own Ryzen 7600 with the exact same motherboard and RAM, except my kit doesn’t even officially support EXPO (Intel XMP only), and it runs 6400 CL32 without issues. I ended up settling at 6000 CL30 anyway. Same story with a 7800X3D build I did for a friend, and another one with a 9700X. I also had random 6000 CL30 kits work first try on this same motherboard.

The only difference in this build is that we’re using a single 16GB stick for now, since we all know why. He’ll add another stick later if prices become reasonable again. All my previous AM5 builds were dual channel. (single dimm is in the slot further from CPU)

Any ideas what could be causing this? Is it just that the 8400F memory controller is that bad, or am I missing something obvious?

I just built a PC for my nephew. ASRock B650M-HDV/M.2 (BIOS 3.40), Ryzen 8400F, Patriot Viper 16GB DDR5 6000 CL30 (9DE00412-VEB516G6030W).

It only works at base 4800 CL40 AUTO. I tried EXPO 6000 CL30, EXPO 5600 CL36, XMP 6000 CL30, XMP 5600 CL36, and manual settings for 5600 CL40 at 1.35V, and none of those boot. EXPO 5600 CL36 reboots but falls back to 4800, everything else looks completely dead. I let each “dead” configuration train for at least 15 minutes, probably closer to 20. Nothing. The only way to get it working again is clearing CMOS and going back to 4800.

This is new for me. I’ve never had RAM issues like this on AM5 with either manual tuning or EXPO/XMP profiles. This is my fourth AM5 build. I have my own Ryzen 7600 with the exact same motherboard and RAM, except my kit doesn’t even officially support EXPO (Intel XMP only), and it runs 6400 CL32 without issues. I ended up settling at 6000 CL30 anyway. Same story with a 7800X3D build I did for a friend, and another one with a 9700X. I also had random 6000 CL30 kits work first try on this same motherboard.

The only difference in this build is that we’re using a single 16GB stick for now, since we all know why. He’ll add another stick later if prices become reasonable again. All my previous AM5 builds were dual channel. (single dimm is in the slot further from CPU)

Any ideas what could be causing this? Is it just that the 8400F memory controller is that bad, or am I missing something obvious?

I just built a PC for my nephew. ASRock B650M-HDV/M.2 (BIOS 3.40), Ryzen 8400F, Patriot Viper 16GB DDR5 6000 CL30 (9DE00412-VEB516G6030W).

It only works at base 4800 CL40 AUTO. I tried EXPO 6000 CL30, EXPO 5600 CL36, XMP 6000 CL30, XMP 5600 CL36, and manual settings for 5600 CL40 at 1.35V, and none of those boot. EXPO 5600 CL36 reboots but falls back to 4800, everything else looks completely dead. I let each “dead” configuration train for at least 15 minutes, probably closer to 20. Nothing. The only way to get it working again is clearing CMOS and going back to 4800.

This is new for me. I’ve never had RAM issues like this on AM5 with either manual tuning or EXPO/XMP profiles. This is my fourth AM5 build. I have my own Ryzen 7600 with the exact same motherboard and RAM, except my kit doesn’t even officially support EXPO (Intel XMP only), and it runs 6400 CL32 without issues. I ended up settling at 6000 CL30 anyway. Same story with a 7800X3D build I did for a friend, and another one with a 9700X. I also had random 6000 CL30 kits work first try on this same motherboard.

The only difference in this build is that we’re using a single 16GB stick for now, since we all know why. He’ll add another stick later if prices become reasonable again. All my previous AM5 builds were dual channel. (single dimm is in the slot further from CPU)

Any ideas what could be causing this? Is it just that the 8400F memory controller is that bad, or am I missing something obvious?