From the JEDEC Standard 21-C, Annex K: Serial Presence Detect (SPD) for DDR3 SDRAM Modules, Document Release 6 the following definitions for "Byte 31: SDRAM Thermal and Refresh Options" bit 1.
Extended Temperature Refresh Rate
1 = Extended operating temperature range from 85-95 ï‚°C supported with standard 1X refresh rate
0 = Use in extended operating temperature range from 85-95 ï‚°C requires 2X refresh rate
The bit is to indicate if a 1X refresh can be used in an extended temperature range or if a 2X refresh rate must be used.
The AIDA64 report reports for the "Extended Temperature