odf opened this issue on Oct 27, 2008 · 13933 posts
bagoas posted Thu, 18 August 2011 at 12:17 AM
And there is more
operating system 32 or 64 bits
processor type
Differences are in computationally intensive areas, where results of floating point calculations are used in floating point calculations, that are used in ... etc. Minute differences in the result of one calculation are magnified in the following one.
Different processors (AMD versus Intel) or different versions of same manufacturers, running the same code can give the differences you see. The higher quality the image, the more loops the process makes (and the more time it takes), the more repeating calculations, so the larger the differences in the outcome. This is referred to as 'stability' and it is a major area of investigation and concern in numerical analysis using integration steps.