It won't. I own a Gigabyte Z370 board with a locked Intel i5-8400. My G.Skill 2666 ran at 2133 during first boot. I had to manually select the XMP profile.
I made an edit on my post... I don't know if the site at the time was broken do to script blocking or what, but it's bare minimum 2666. If that is the case and by said logic would be the lowest speed possible for the board. You're cherry picking my post now and avoiding the edit.
Remember, XMP means "Intel Extreme Memory Profile".
(I'm condensing this because you're going on about AMD. Also, if I'm reading something wrong sorry, as I am going on almost two days no sleep. Thanks thyroid for giving me insomnia).
My question now is. Who said otherwise and whom is using AMD in this thread with the mindset of XMP other than you? OP is using an Intel system and we were talking Intel, then you come along with AMD CPU's. I don't understand where the tie in of XMP and AMD you're trying to make is coming from.
It pretty much does. You're talking about rare and extraordinary circumstances.
Pretty much does isn't "it just works". Throwing out the idea that XMP could fail and calling it less likely to happen, isn't a one-hundred percent guarantee. There is no such thing as a one-hundred percent guarantee. I'm not saying it will happen or is a guarantee it will happen. It's just you're arguing over petty details with wishy-washy replies like, "it pretty much does". Sure you might not get DOA hardware, but it happens. Sure you probably wont get a monitor with dead pixels, but it happens. Et cetera and et cetera. Would you argue with, "It pretty much does" on those topics as well? It seems like you're just trying to argue to argue at this point.
Never had a problem with XMP. Ever.
Um, congratulations? So because it's never happened to you means it doesn't happen? By all means, congratulations....... (You could say, "well why did you bring it up then", but that was just stating XMP could fail and nothing is 100% with you're snake oil "It pretty much does" guarantee. Your reply now is just sticking your head in the sand and going, "Well I didn't see it or hear it so it doesn't happen").
It's a high-end Gigabyte Mobo, not some off- brand budget board.
Wow it's a high-end brand motherboard and that means it just works... You really need to step away from brand loyalty and the idea that just because something is priced more means it just works. Hardware price doesn't mean it just works or a brand name, as if you actually look around there are plenty of examples.. Though again I have to say you're arguing to just argue at this point. I say something as a small possibility, and you come in complaining that I even brought it up.......