Message boards :
Number crunching :
overclocking can cause floating point errors'?
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Alex Send message Joined: 26 Sep 01 Posts: 260 Credit: 2,327 RAC: 0 |
Am watching the Video by Mr. Anderson http://www.climateprediction.net/project/openday.php 16 minutes (and 50 seconds) into the video, he mentions that Seti sometimes gets bad results from overclockers. |
JigPu Send message Joined: 16 Feb 00 Posts: 99 Credit: 2,513,738 RAC: 0 |
Overclocking can cause any kind of CPU error. Integer, floating point, SIMD, all are susceptable to error. If the CPU is running with insuficient voltage for it's speed, too much heat, or just faster than the chip can handle, errors will inevitably creap in. If you strive for a stable (like Prime95 stable) overclock though, it should be a nonissue. _______________________________ |
Alex Send message Joined: 26 Sep 01 Posts: 260 Credit: 2,327 RAC: 0 |
Is there a benchmark that overclockers can run to verify they're not having floating point errors? |
EclipseHA Send message Joined: 28 Jul 99 Posts: 1018 Credit: 530,719 RAC: 0 |
> Overclocking can cause any kind of CPU error. Integer, floating point, SIMD, > all are susceptable to error. If the CPU is running with insuficient voltage > for it's speed, too much heat, or just faster than the chip can handle, errors > will inevitably creap in. If you strive for a stable (like Prime95 stable) > overclock though, it should be a nonissue. If you want good data, overclocking is bad, as the manufacturer specs are exceeded, and even if it works clean for a time, it could fail later, and you won't know when... On Seti/Boinc however, it will make those "No Scheduler Responded" and "no work available" messages display a bit faster! Seti/BOINC is only crunching data that was already crunched by Classic (Jan04, Aug03, Sept03) so there's no real loss even if you can get work to crunch! (I feel a cheerleader generating a response!) YES, SETI BOINC IS NOT PROCESSING NEW DATA OR OLD DATA IN A NEW WAY TODAY! (see http://setiathome.ssl.berkeley.edu/calendar/calendar.html) |
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