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Because people get boards that do not support it then complain to AMD. Easier to just not claim it's there, like AMD used to. That said, thanks to AMD UEFI mo
by p_l 3y ago
Because people get boards that do not support it then complain to AMD.
Easier to just not claim it's there, like AMD used to.
That said, thanks to AMD UEFI modules always exporting their settings databases, even if vendor didn't provide options to configure things, you can always try to enable ECC (and various other things - beware of possibly damaging the hardware!).
- pedrocr 3y agoHopefully that's it. In the previous generation only the PRO parts had ECC and those were only sold to OEMs.
- p_l 3y agoThe PRO parts are "certified" to have ECC working. Essentially it's binning - AMD takes portion of the bins and runs them through more verification steps including ECC tests. The rest does not get run through ECC testing, but have the exact same parts, and - unlike Intel - AMD does not lock ECC out on them. The CPUs are physically the same except for branding detail.
- bryanlarsen 3y agoBut parts that fail the PRO tests can be sold as non-pro parts, so you better hope you don't get one of those.
- c0l0 3y agoThis is (slightly) wrong. ALL Socket AM4 Ryzen CPUs without an iGPU have working ECC support. ONLY AM4 Ryzen APUs (i.e., CPUs with an iGPU) with the "PRO" infix in their name have working ECC support. However, ALL AM4 platform ECC support also depends on the motherboard vendor/firmware. There are boards on which ECC simply will not work, no matter if your CPU and DIMM combination actually supports it. You have to check the mobo specsheet to make sure it does - ASUS and ASRock, for example, support ECC on most of their boards with a suitable selection of CPU/APU and DIMM. To illustrate the CPU situation with a few examples: - Ryzen 5 3600 - proper, working ECC support possible. - Ryzen 7 5800X - proper, working ECC support possible. - Ryzen 9 3900X - proper, working ECC support possible. - Ryzen 5 5600G - no ECC support possible. - Ryzen 7 5700G - no ECC support possible. - Ryzen 5 PRO 5650G - proper, working ECC support possible. - Ryzen 7 PRO 4750G - proper, working ECC support possible.
- p_l 3y agoApparently this might be specific to AM4 iGPU models? I've seen suggestions that for PRO, the memory controllers were redone. Wouldn't surprise me if the story is that Cezanne had a design error resulting in inoperational ECC, especially given that unlike done other models in the series they are not chiplet based.