B450M/ac R2.0 PFEH and ECC question

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   Good day to you Xaltar (or any moderator who is monitoring this thread). 
I was trying to make a new thread but I fell on this post instead.
Would it possible to make a new thread regarding memory modules, PFEH (platform first error handling), as well as full ECC support for an ASRock B450M/ac R2.0?
I'm simply wondering if anyone has had full on ECC working on windows and/or linux, plus other modules than the 2 listed often times in the spreadsheet for this specific motherboard.

Thank you so kindly and happy holidays!

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MT550 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 02 Oct 2025 Status: Offline Points: 30	Post Options Post Reply Quote MT550 Report Post Thanks(0) Quote Reply Topic: B450M/ac R2.0 PFEH and ECC question Posted: Yesterday at 12:31pm
	Good day to you Xaltar (or any moderator who is monitoring this thread). I was trying to make a new thread but I fell on this post instead. Would it possible to make a new thread regarding memory modules, PFEH (platform first error handling), as well as full ECC support for an ASRock B450M/ac R2.0? I'm simply wondering if anyone has had full on ECC working on windows and/or linux, plus other modules than the 2 listed often times in the spreadsheet for this specific motherboard. Thank you so kindly and happy holidays!

MT550 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 02 Oct 2025 Status: Offline Points: 30	Post Options Post Reply Quote MT550 Report Post Thanks(0) Quote Reply Posted: 19 hours 58 minutes ago at 3:27am
	Additional context - While it is specified in the board's manual that only KSM26ED8/16ME (ECC), TE416G26D819-UHA (ECC) for the vermeer, matisse and renoir architectures and CT8G4WFD824A.18FB1 (ECC), AD4E2133W8G15-BHYA (ECC) & M391A1G43EB1-CPBQ (ECC) for pinnacle ridge, raven ridge and summit ridge. At least from what I can see specified on the board's page. As for the B450M/ac R2.0, I am trying to understand if it's only ECC modules (no ECC mode) or if ECC modules support ECC mode entirely. Deriving from alot of cross referencing I came to the conclusion that any Asrock boards equipped with PFEH can redirect the ECC to the BIOS (controller) or OS directly - partially or fully. So my questions are as follows: 1. Does the board support full ECC mode (not just physical modules) ? 2. Whilst there are specified modules, from what I've heard, the rule of thumb being same family of RAM equates to full ECC support. Has anyone ever tried that out if they've had the chance? 3. If yes to the above, how does ECC run on windows 10 (Home, Pro and Enterprise), as well as linux (Void, Arch and Debian/Ubuntu) ? What began as an inquiry on pcpartpicker led me here, given the lack of documentation of ECC on AM4 platforms is very frustrating. Any PRO cpus pair with good RAM, that's a given much less unofficially some others from what I've heard. To that end, I hope to hear anyone willing to share their experience with this board (or similar). I would also be very happy if this thread could serve as a solid reference for future inquiries. Also props to ECCential, he answered a few of my questions a couple of weeks back. Very helpful and thanks to him! Happy holidays to all.

eccential Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 10 Oct 2022 Location: Nevada Status: Online Points: 6740	Post Options Post Reply Quote eccential Report Post Thanks(0) Quote Reply Posted: 1 hour 45 minutes ago at 9:40pm
	Assuming AsRock spec pages says a motherboard supports ECC, I imagine it will behave like all other AsRock boards that support ECC, because I can't imagine them doing anything different in the BIOS. How comprehensive that support is, I don't know. All I know is that I did see one correctable error reported on Fatal1ty B450 Gaming-ITX/ac (or was it X470 version?) with Ryzen 3 PRO 2200GE, running FreeBSD. Would AsRockRACK boards have more comprehensive support than regular AsRock boards? Again, I don't know. You would find way more people with ECC memory experience at Level1Techs forum. As for module compatibility, I wouldn't bother with QVL at all. Pretty much all Unbuffered (very important) ECC DIMMs you can buy are 100% JEDEC spec. So they'll all behave correctly. I know Kingston made some oddball overclockable ECC RDIMMs, but you'd know they're not "normal" based on their flashy advertising. On a side note, I randomly tried an 8GB DDR3 EUDIMM I had on an old motherboard that did NOT support ECC, and it worked fine. But dmidecode showed ECC functionality as NOT enabled. Funny, it still said "Total Width: 72 bits," but the correction mechanism was None. All my AsRock boards show "Error Correction Type: Multi-bit ECC," so that's a good sign.