freebsd stable - Jan 2018 - Ryzen issues on FreeBSD ?

The RAM was detected by the MB as 2400.  I didn't change it until I set it
to the slower speed.

On Wed, Jan 24, 2018 at 7:06 AM Mike Pumford <michaelp at bsquare.com>
wrote:
> On 24/01/2018 11:55, Nimrod Levy wrote:
> > Changing the memory speed from 2400 to 2133 in the BIOS has given me
4.5
> > days of uptime so far.
> > The memory is supposed to be 2400.
> > I'm still confused, but I'll accept the result
> >
> I've run into this on modern Intel systems as well. The RAM is sold as
> 2400 but thats actually an overclock profile. If I actually enabled it
> (despite both board and RAM being qualified for that) the system ends up
> locking up or crashing as soon as you stress it. Go back to the standard
> DDR profile advertised by the RAM and it is totally stable.
>
> Mike
> --
> Mike Pumford | Senior Software Engineer
>
> T: +44 (0) 1225 710635 <+44%201225%20710635>
>
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-- 

--
Nimrod

On 24/01/2018 12:11, Nimrod Levy wrote:
> The RAM was detected by the MB as 2400.? I didn't change it until I set
> it to the slower speed.
> 
I guess the Intel motherboards I have are more conservative then. They 
default to the standard RAM profile (slower than what it is sold as) and 
you have to explicitly enable the faster profiles (which do also come 
from data  read from RAM). So it seems like your BIOS vendor is picking 
the faster profile as a default.

I've got a couple of intel systems like this (one windows and one BSD) 
and neither ran stable with the faster RAM profiles.

 From what I read at the time 2133 is the official upper limit of the 
DDR4 standard. Any speed faster than that is an overclock profile.

Mike

-- 
Mike Pumford | Senior Software Engineer

T: +44 (0) 1225 710635

BSQUARE - The business of IoT

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