Date: Thu, 13 Feb 2020 07:13:19 -0800 From: Chris <bsd-lists@BSDforge.com> To: Peter Jeremy <peter@rulingia.com> Cc: freebsd-current <freebsd-current@freebsd.org>, mike tancsa <mike@sentex.net> Subject: Re: Which AMD CPUs are supported -- temperature Message-ID: <b136671faec4a6e94894a4f922eb9874@udns.ultimatedns.net> In-Reply-To: <20200213072212.GB79914@server.rulingia.com>
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On Thu, 13 Feb 2020 18:22:12 +1100 Peter Jeremy peter@rulingia=2Ecom said > On 2020-Feb-12 15:23:51 -0500, mike tancsa <mike@sentex=2Enet> wrote: > >Not sure about the older Athlon CPUs, but the 2 generations of Ryzen's I > >have seem correct as well as an APU > > > >CPU: AMD GX-412TC > >SOC=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 (998=2E17-MHz > >K8-class CPU) >=20 > OTOH, I'm not confident about temperatures on my APU=2E The publicly > available data just says that the SoC reports "a temperature on its own > scale" relative to a Tctl_max which "is specified in the power and therma= l > data sheet" (that I have been unable to locate)=2E Everyone seems to assum= e > that the step size is 0=2E125K but I haven't found that publicly documented > anywhere=2E The AMD Product Brief states that the maximum temperature is > 90=C2=B0C but using that as Tctl_max gives me temperature readings that d= on't > look right=2E >=20 > >And on a fanless APU > > > ># sysctl -a dev=2Ecpu=2E0=2Etemperature > >dev=2Ecpu=2E0=2Etemperature: 62=2E6C > > > ># sysctl -a dev=2Eamdtemp=2E0=2Ecore0=2Esensor0 > >dev=2Eamdtemp=2E0=2Ecore0=2Esensor0: 63=2E1C >=20 > At what ambient temperature? I see a similar value from my (idle) APU3 > but don't believe the (implied) ~35K junction-to-ambient difference=2E I've read that (most?) of the Intel CPUs (everything since "core" versions) has a copy of MINIXv3 on them @ ring -3=2E Does/could the AMD System Manageme= nt Network provide any *additional* clues? And *why* won't AMD provide more *definitive* specs? Hoping consumers "cook= " their (A|C)PUs and ultimately buy more of their product? --Chris >=20 > --=20 > Peter Jeremy
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