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You never did mention which BIOS version you were using. The newest one listed at ASUS from 04/27 is 4011. BIOS can have a big impact on a new CPU
I'll throw this in as a personal take on what I think is part of the problem concerning RAM speeds vs board models.
Note the following is just speculation on my part based on pure observation around the web and the personal experience with the board I have (Maximus IX Hero) which BTW, this particular model has been shown and proven to have issues with RAM speeds after a certain point with no others in the Z270 ROG line having these issues reported consistenly like this model has.
I can use my own board as an example - About every other one like it doesn't clock RAM worth ****, the ones above it on the model ladder of Z270 ROG boards don't seem to have as many issues or even any really in comparison about getting some good RAM speeds. It's claimed by Asus these are capable..... And I believe they actually are BUT I'm thinking the ability to OC RAM with this model has been hindered intentially.
I say this because when it comes down to it, if you have a given board model that does just as good as a higher model in about everything you'd expect the customer to be using it for, then you already know the customer will always go for the board that costs less - It's a no brainer. Even if reviews of the model in question "Show" it doing well vs others we all know those guys (Reviewers) have pieces that's probrably not like what the retail pieces would be, such as a special BIOS tailor-made for that purpose as an example.
This way they can "Prove" the claim yet not give up the goods at a discount - Plus reviews are for making something look good vs offerings by the competition anyway, they all do it you know.
It's all about the Cha-Ching(!) guys.
I'm thinking the B350 board is in a similar boat, although it's probrably capable at the same time it has been tethered or limited in some way vs the more expensive/higher model boards.
OK - I'm done.
The new Ryzen did include improvements in cache which is tied to the IMC. So it's quite possible your ram isn't going to run at the same settings it did with the 1700 and would need to be re-tweaked, starting from the beginning and yes if the ram isn't stable the CPU won't be either which could explain your issues. Have you tried testing the CPU stability with the ram at default(2133)
I'll throw this in as a personal take on what I think is part of the problem concerning RAM speeds vs board models.
Note the following is just speculation on my part based on pure observation around the web and the personal experience with the board I have (Maximus IX Hero) which BTW, this particular model has been shown and proven to have issues with RAM speeds after a certain point with no others in the Z270 ROG line having these issues reported consistenly like this model has.
I can use my own board as an example - About every other one like it doesn't clock RAM worth ****, the ones above it on the model ladder of Z270 ROG boards don't seem to have as many issues or even any really in comparison about getting some good RAM speeds. It's claimed by Asus these are capable..... And I believe they actually are BUT I'm thinking the ability to OC RAM with this model has been hindered intentially.
I say this because when it comes down to it, if you have a given board model that does just as good as a higher model in about everything you'd expect the customer to be using it for, then you already know the customer will always go for the board that costs less - It's a no brainer. Even if reviews of the model in question "Show" it doing well vs others we all know those guys (Reviewers) have pieces that's probrably not like what the retail pieces would be, such as a special BIOS tailor-made for that purpose as an example.
This way they can "Prove" the claim yet not give up the goods at a discount - Plus reviews are for making something look good vs offerings by the competition anyway, they all do it you know.
It's all about the Cha-Ching(!) guys.
I'm thinking the B350 board is in a similar boat, although it's probrably capable at the same time it has been tethered or limited in some way vs the more expensive/higher model boards.
OK - I'm done.
I agree, just because something is a lower model doesn't mean it's bad, the older DFI NF4X Infinity for Socket 754 as an example is clear evidence of this fact.
I just seen this as a trend in the overall with my own example falling into this group. It can't even run the RAM I have for it at it's rated speed (3866), goes to about 3200 and that's all I can get - Even at that speed it tends to be unstable so ATM I have it at 2800 and it's doing fine as is. Each make and model are indeed different and each maker does things differently, just how it is.
I know if I'm shopping for a board that's supposed to do this and that, then it doesn't with a clear, proveable trend that follows it as not being able to it's not speaking well of it regardless of intented purpose.
Asus on it's product page https://www.asus.com/us/Motherboards/ROG-MAXIMUS-IX-HERO/ claims this board can run RAM up to 4133+ and it's probrably true with a few examples but the dissapointment is the same as with any other that falls short on delivering what's promised. BTW the sticks I have are on the QVL for the board, made double-sure of it before I hit the button to buy them.
Ryzen+ will run stable, but its not plug and play. You have to work at it. All new ram sub timing, learn your Bios. The biggest thing is READ all you can about the chip and your system.
I heard the Gigabyte x470 Aorus gaming 7 has the most Ram timing Options, but I have not tried the board personally. I was thinking about giving it a try, because that's where Ryzen+ Overclock the best.
I can't say that it has more or less, I think the MSI is similar but the Giga board doesn't show current timin numbers in BIOS except for the few main timings. Can make tweaking difficult since you don't know where you're starting from.