<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 15 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
font-size:12.0pt;
font-family:"Calibri",sans-serif;
mso-ligatures:standardcontextual;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style></head><body lang=EN-US link="#0563C1" vlink="#954F72" style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'>Question please for microprocessor gurus please.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'>In the olden days, we fooled around with overclocking processors, above their stunning 1.4 MEGAHERTZ (hey, I did say OLDEN days (a decade before we were giga-ing anything (when plenty of us were still kiloing about in our quirky electro-mathematical hobby.))) <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'>We knew what happens when we overclocked a processor: it got hotter and might still work up to perhaps 2 MHz if a prole was clever with his heatsinks and such, but it might crash or glitch and if the misguided prole is running Lucas Lehmers, the checksum indicates he was a bit too ambitious.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'>We also knew back in the olden days one could go downclock: run the processor slower than spec. We did it just to verify it could be done, not that it would have any practical purpose. Now it might have a practical purpose to downclock. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'>What I don’t know is if modern high-end GPUs can be underclocked reliably. My reasoning suggests they can be underclocked. There is no apparent reason why not, but please verify, for my experience came from the days when the clock circuitry was external (Motorola did it that way intentionally before the venerable 6502.) I don’t know that it is that it is done that way today, that it is even possible to underclock a modern microprocessor. If so, is it done the old-fashioned way: oscillator to a signal generator which Fourier square-wave-izes the signal and feeds back into the (defeated) processor clock?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'>If a modern processor cannot be underclocked because there is no user-accessibility to the timing circuitry, but a prole has the idea(r) of using a microprocessor as intelligent cabin heaters in electric cars, replacing a resistance coil (which seems like an egregiously wasteful path to high entropy) perhaps there is a software workaround. If the EV cabin heater is turned open throttle full heat, then the processor would work at maximum capacity. If it is only a little cool outside and the prole wants only a tenth the heat, then the processor could do bursts of calculation: mine for BitCoins one second, idle for ten seconds, repeat, result low heat to EV cabin.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'>After I wrote that paragraph above, the workaround notion grew on me: EV cabin heater control via software is a better idear than attempting to underclock a modern GPU: it doesn’t require expensive hardware modification.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'>Sheesh, I answered my own question just by asking it. It’s embarraskin I tells ya.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'>spike<o:p></o:p></span></p></div></body></html>