4 ms·
So much less than the 0.01% of the variation in identical computers due to 100ppm crystal variation. Also less than the 0.0001% variation due to the temperatur
by morcheeba 6y ago
So much less than the 0.01% of the variation in identical computers due to 100ppm crystal variation. Also less than the 0.0001% variation due to the temperature in the room changing 1 degree.
- jobigoud 6y agoWonder if it's less than the probability of getting hit by a cosmic ray flipping a bit somewhere in the implementation and changing the result.
- bitcharmer 6y agoThis is very interesting. Where can I find more details on crystal quality in popular CPUs like Intel's Xeons?
- morcheeba 6y agoXEONs use a 100MHz referenced called "BCLK" and scale this up to the different frequencies it needs internally (core, dram, pci, etc.). Typically this info is found in the datasheet, but only the DC parameters (voltage min/max) etc were found in the first datasheet I found. Timing is so important that often processor manufacturers will have an apnote discussing it in detail, often with suggested parts and circuit layouts. https://www.intel.com/content/www/us/en/products/docs/processors/xeon/2nd-gen-xeon-scalable-datasheet-vol-1.html https://www.intel.com/content/www/us/en/products/docs/proces...