Christian Ney over at OCaholic has discovered the root cause of the Windows 8 RTC bug that led HWBot to ban all Windows 8 submissions. In collaboration with CPU-Z author Franck Delattre it was discovered that overclocking plays havoc with the four internal system timers. ACPI, HPET, RTC, and QPC are the four main timers on the system but the RTC and QPC timers go a bit crazy when the bus frequency is changed using a Windows based program.
That same problem does not happen when the frequency is set using the system BIOS and the system is made to boot from the changed frequency. The testing therefore infers that Windows 8 doesn’t use ACPI or HPET but instead a different internal timer. The bug doesn’t appear to affect AMD systems but under some circumstances it can. Based on the findings a bug fix is now available, which has to be applied using a command line setting. If there was some way for CPU-Z to represent if the bug-fix has been applied then HWBot could review its Windows 8 submission policy to allow Windows 8 submissions again.
The conclusions from Christian Ney’s research are as follows:
Image courtesy of OCaholic
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