128 gb

[zattone]

I bought 2 kits of F5-6000J3040G32GX2-TZ5NR, for a total of 128 GB. I thought they were compatible, but when I install the second kit, the PC doesn't boot.
I have an Asus ProArt B650 motherboard with the BIOS updated to the latest version, and an AMD Ryzen 7950X processor.
Is there any setting in the BIOS that needs to be configured to make 128 GB work together?
thank you

[emissary42]

Usually you are going to be frequency limited by CPU/MB with four modules installed. So even with matched modules, DDR5-6000 is often not guaranteed.

Generally you would want to either wait for higher density modules and switch to a 2x64GB kit, or get one of the new quad kits once they are available (if they are compatible with your MB). The other option would be to disable the EXPO, prior to installing the additional modules and then try to find the max frequency that your system can still handle, starting from DDR5-3600 moving upwards. The DRAM training might take a while / several minutes with 4x32GB, so be patient with the POST.

[zattone]

Thanks for your reply, I followed your instructions and it seems to work at frequency 3600.

Does this significantly affect performance, especially in 3D programs with simulations?

thanks for your support

[emissary42]

How much it impacts the performance for your use case is difficult to say. If that is very important to you, maybe directly compare both setups yourself.

When DDR5-6000 via EXPO does not work with four modules installed, usually one ends up in the DDR5-4800/5600 range.
DDR5-3600 is the AMD spec for 2DPC, but most Ryzen processors can actually handle a bit more than just that.

The motherboard also has an impact, though. If you saw the Computex announcement for example, some boards seem to to do fairly well with full slots and higher density DRAM (4x64GB).