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post #8741 of 11730
Quote:
Originally Posted by Scotty99 View Post

Nah some ram on some boards simply wont post above 2400 no matter what you do. Also that even number thing is not real either, i had a 4000 kit that i had at cas 15 2933.

It may or may not work, but trying it out won't hurt anything! I know some of the B350 boards are pretty picky with RAM though.
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post #8742 of 11730
Quote:
Originally Posted by Scotty99 View Post

... that even number thing is not real either, i had a 4000 kit that i had at cas 15 2933.
The even CL thing is real, or it was at one point. People were complaining about it, and reviewers commented on it. It may or may not be applicable now, or it might depend on what BIOS version you're using or something. I don't use odd CL numbers on Ryzen, so I couldn't tell you for sure.
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post #8743 of 11730
Quote:
Originally Posted by LazarusIV View Post

It may or may not work, but trying it out won't hurt anything! I know some of the B350 boards are pretty picky with RAM though.

Right, was just pointing out that some ram is actually stuck at 2400 and that this is a normal situation. People shouldnt get worried that it wont work down the road and spend money needlessly on different ram, because that isnt guaranteed to work either.
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post #8744 of 11730
Quote:
Originally Posted by Scotty99 View Post

Right, was just pointing out that some ram is actually stuck at 2400 and that this is a normal situation. People shouldnt get worried that it wont work down the road and spend money needlessly on different ram, because that isnt guaranteed to work either.

Yeah, good point. Still early for this chipset so people should be going in with their eyes wide open, knowing they may be "beta testing" some of this hardware smile.gif

Also, I think going into buying RAM knowing you might not ever get the "rated" speed is the best bet. Then, later on as things get ironed out, you can unlock your RAM's true potential biggrin.gif A lot of people think that just because your RAM says 3200MHz at 14-14-14-32 on the package, it should magically do that right off the bat, no work required! Unfortunately, it doesn't work like that.. .but it could in the future! Here's to hoping!
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post #8745 of 11730
Maybe if they let us play with the sub timings!
post #8746 of 11730
Quote:
Originally Posted by Scotty99 View Post

Nah some ram on some boards simply wont post above 2400 no matter what you do. Also that even number thing is not real either, i had a 4000 kit that i had at cas 15 2933.
tbh, I strongly suspect that the CPU is the limitation and not the board. In the C6H thread a few people bought a second CPU and then suddenly had their old RAM and board doing 3200 with ease. It also seems to affect all R7 SKUs.
Either the IMC or maybe even the data fabric, which is bound to memory speed, is limiting the memory speeds.

I'm just speculating here, but I'd be surprised if actually the boards themselves are limiting in most cases.
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post #8747 of 11730
Just reporting something I just noticed. Should have done this the moment I got the replacements.

As some might know I had my Corsair Ram die on me on my first week on Ryzen. A kit off "CMK16GX4M2A2666C16R ver 5.30" 2666Mhz C16 2x8GB 1.200Volts

I could boot with 2933 but got errors and later 1 dead stick of ram. They were "1Rx8" single ranked kit. Worked like a charm @ XMP the while they lasted.

Took a week and I got my replacement kit. Same stuff I thought. Same "CMK16GX4M2A2666C" but I never checked properly. Did not read the label on the kits themselves or check them out before installing than reading the box.

Only thing I noticed was I could no longer boot with 2933 as I started to try OC my kit later, XMP worked as before with no issues. I just stuffed that too bad luck with worse kit I thought.
Now I noticed the are "2Rx8". dual rank memory. Same timings and voltage and part number but a crucial difference, a different version I reckon, and DUAL RANK

They are Micron chips. Got a little pissed that I didn't get some of the same stuff I sent in. YAY for memory lottery!

Dual rank 2x8GB 2666Mhz works without issues on AB350-Gaming 3 tongue.gif
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post #8748 of 11730
Quote:
Originally Posted by f1LL View Post

tbh, I strongly suspect that the CPU is the limitation and not the board. In the C6H thread a few people bought a second CPU and then suddenly had their old RAM and board doing 3200 with ease. It also seems to affect all R7 SKUs.
Either the IMC or maybe even the data fabric, which is bound to memory speed, is limiting the memory speeds.

I'm just speculating here, but I'd be surprised if actually the boards themselves are limiting in most cases.

Nah its the memory and board combinations, bios just too young still. All 3200 memory on the market will be working on every am4 board in ~2months time.
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post #8749 of 11730
Quote:
Originally Posted by Scotty99 View Post

Nah its the memory and board combinations, bios just too young still. All 3200 memory on the market will be working on every am4 board in ~2months time.

Why do people get different memory speeds on the same board and same memory then, when the only difference is a new CPU of the same make and model?

EDIT: To elaborate, I don't know enough of the intricacies of CPUs but I would still suspect that this would be fixable with microcode or AGESA or w/e updates. Maybe it's even possible to "unlink" the data fabric speed and the memory speed? I don't know...
Edited by f1LL - 4/13/17 at 8:43am
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post #8750 of 11730
Quote:
Originally Posted by Scotty99 View Post

Nah its the memory and board combinations, bios just too young still. All 3200 memory on the market will be working on every am4 board in ~2months time.

That's a pretty bold claim. I tend to agree that it has to do with the memory and the IMC but not necessarily the board based on what I've read. The only way the board makes a difference is if it's running a BIOS with different AGESA.
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