X370 Fatal1ty Gaming Professional - [BIOS v2.x]

Teckie wrote: Yes I tried this lastnight and it didnt help. I spent another hour or so trying different mem speed and c-line lvl and the result is unchanged. I have not seen or found a single person out there who owns this board and able to overclock and run it with STABILITY. Is this board overclock-able ? Cause i got the impression from the way ASrock advertises it or am i really missing something here ? Now I'm curious if this Agesa version has been thoroughly tested on this board before it got released.

Edited by Mojobaggins - 13 Jun 2017 at 1:34am

@Teckie,

Yea. AMD memory controller haven't much appreciated this. On very rare occasions I have seen it work. Timings and sub timings, and to an extent vDIMM, are critical if this is even to be considered. Even then YMMV .......

I'm gonna get parsec to describe it from the point of some not all Intel processors.

cutterjohn wrote: wardog wrote: cutterjohn wrote: That said I had a mixed setup on an ASUS X79 board that worked fine for me... I was running 4x8GB and 4x4GB(original RAM) for a while... I'd have to get parsec in here to give the technical nomenclature for what and why Intel can do that. Rest assured, AMD doesn't play as nice with this supposed mem set up. Don't get me wrong, you're free to try. I'm only voicing my past experiences and knowledge. I'd love dearly to hear you succeed. would this happen to be an AMD specific thing then? The RAM on the X79 was Corsair Vengeance series which I had running @ 1600Mhz... I late replaced the 4x4GB kit with a second 4x8GB since at the time memory had gotten to be dirt cheap, got the kit for c. $50 IIRC...

On the Intel side, it's called Intel Flex Memory Technology. It's active when DIMMs of unequal capacity such as 4GB and 8GB, are mixed together in a memory channel. The drawback about it is the smaller capacity DIMM determines the maximum amount of the capacity of the larger DIMM that will work in dual/multi-channel mode. The remaining capacity of the larger DIMM will operate in single channel, non-interleaved mode. The result is one symmetric and one asymmetric "zone" of memory. But it does allow the use of mixed sized DIMMs, that must otherwise be of compatible memory chip types, and organization of the chips. Type does not mean the same manufacture.

Does AMD/Ryzen have this type of memory support? No idea, I have yet to see a Ryzen processor document that is the equivalent of an Intel processor datasheet. If we check the manual of an Intel Z270 board, the memory specs include this statement:

For dual channel configuration, you always need to install identical (the same brand, speed, size and chip-type) DDR4 DIMM pairs.

Note that this specifies for dual channel configuration, which implies the existence of Flex Memory support.

If we check the memory specs of the X370 Fatal1ty Professional Gaming board (online manual), we find the same thing. If it is true or not, who knows?

If you are using two completely different models of memory, including different memory chip manufactures, then only if the memory chip design is the same (device technology and organization) will there be any chance of them working together. That goes for any system, Intel or AMD.

Also, too many unknown variables between the memory used in your X79 board, and this one to predict the outcome. My only point is if it does not work, don't blame ASRock. The memory controller is on the CPU and designed by AMD. Memory compatibility is the biggest issue with Rzyen, and a world of its own. That makes predictions even more difficult.

I'd be happy if it works for you, but not in the least surprised if it doesn't. If it does I'd love to know the model numbers of both memory models.

Also, don't compare the behavior of your Ryzen system with others you've had in the past, as an indication of what is normal or abnormal. Ryzen has a few unique behaviors, like the on and off sequencing during POST when performing memory training. If you don't like that, set the AMD Advanced Boot Training option in the UEFI to disabled.

For anyone who's having trouble getting their memory to post at the same speeds as BIOS 2.30 and is confused by the new timings settings, try raising your tCS.  Previous BIOS automatically set it to 75 when boot training which allows for a lot of leniency in terms of getting memory to work at faster speeds but is also a very loose timing.

Edited by yoonie - 14 Jun 2017 at 10:02pm