tibu

It was sold to me by Amazon with the specific promise to be compatible with Ryzen's 4000er series. Not your problem, I know. But after I return the kit I probably will buy a different manufacturer from the list of compatible kits I got from ASRock.

I am in contact with Asrock now and we are clarifying if there is an incompatibility. It does not sound as if the memory size is the problem. Correct. When I try both RAM sticks together in a different system (an Intel based Laptop), the RAM works like a charm.

I recently bought an Asrock 4X4 BOX-4800U. For anyone not familiar with this system: It is barebone system with an AMD Ryzen 4800U APU, which means it integrates a 4000er AMD CPU with Radeon Graphics. According to the specs, it should be compatible with any 64GByte kit of two DDR4 SO-DIMMs up to 3200Mhz. I bought the CMSX64GX4M2A2933C19, which also is supposed to be compatible with the aforementioned APU. When I use the memory kit or any one of the two modules in my Asrock, memtest86 reports almost the whole memory as erroneous and I cannot get the system to boot from any of my USB sticks or from the Linux I installed to the SSD. All errors lead to memory errors ('Checksum failed', 'could not access root', etc.). When I try different RAM in the ASrock (I have an 8GByte Samsung Stick laying around), I can get Linux to boot. When I try the RAM kit in a different Laptop, I can get Linux to boot. In both scenarios, I can also succesfully test the system with memtest86. That means: Only when I put the memory kit into the asrock, I get memory errors galore and memtest86 fails miserably. Does anyone have an idea what I could do? The asrock bios does not allow me to change any memory settings, no timings, no voltage, no profiles. I also updated to bios to the latest version to no avail. I disabled Cool&Quiet and also tried many other Bios options. It always fails.