On 1/27/21 8:41 PM, Len Ovens wrote:
On Wed, 27 Jan 2021, david wrote:
Intel doesn't run at top speed "forever". Fastest clock I've got from
my nominal 5GHz-max i9 in my Dell XPS 15 is 4.7GHz. Intel runs clock
speed until thermals say "Slow down." If you're talking about a
laptop, the
Yes heat is the limit. My (older now) i5 will run at rated speed
forever and in fact can run at .2Ghz over that without triggering heat
throttling.
Heat *dissipation* is the limit. Laptops are very poor at heat
dissipation. An over-packed compact desk case can have problems. One
benefit to the old-school full height case. ;)
specific laptop's ability to dissipate heat is the controlling
factor. I'm not sure that Intel thermal control is anywhere within
reach of BIOS and OS software.
I would tend to agree with the engineering, but it is possible to set
the top speed below rated if heat dissapation is not up to full speed.
My steady state device temperature while building Ardour lets me know
when I need to clean the dust out... after about 10min of all cores at
100% the temperature reaches a top temperature and sits there with no
speed drop. If I have boost turned on the speed seems to sit .2 Ghz
higher.
The only way my i9 will hit 5GHz, according to Intel specs, is if it's
only using 1 core.
From helping people trouble shoot newer HW than mine, it seems newer
HW (firmware?) does a better job handing out irqs with none of them
being doubled up. However, it seems harder to prioritize a USB device
above other USB devices... maybe it matters less for some systems.
Could be, I don't know. Particularly when you start mixing USB1, USB2,
USB3, USB3.2/USB-C into things.
I got an older firewire device this past year (Audiofire 12) and while
use under the new ALSA fw modules has been poor (256 frame size
minimum), Used with the ffado modules... it seems to shine better than
anything I have seen... it is true that at 16/2 (I thought it needed
/3 but /2 works) the DSP is up at 25% with just jack running (with
pulse bridging), there are no xruns unless runninig for days when
there may be one xrun. This is better than my old ice1712 PCI card
which can also run at 16/2 but not without the odd xrun. USB? I don't
have a "good" USB device... but I have not heard great things about
even the best of them. (my $1 USB 1.1 audio devices will not run below
64/2 without locking jack up)
My USB device runs at 64/3. I didn't have any JACK lockups at 64/2, but
got lots of xruns.
The audio community lost out with the "everything is USB" systems of
today. I can't afford to try the PCIe cards from AudioScience or the
like to compare. I hope the next gen is better.
I agree with that. I only hope the USB-C/3.2 doesn't mean a barrage of
proprietary drivers.
--
David W. Jones
gnome@xxxxxxxxxxxxx
authenticity, honesty, community
http://dancingtreefrog.com
"My password is the last 8 digits of π."
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