In BIOS what does SDRAM Timing by SPD do?

[Duster.]

Hi
Can you tell me what SDRAM timing by SPD does please. At the moment it's set to disable.
Thanks

[Duster.]

No Worries, ive found the answer...-

SPD (serial presence detect) is a small non-volatile RAM chip attached to SDRAM modules that contains information about the memory. This information includes the number of row addresses, number of column addresses, error detection/correction, refresh rates, data width, and the interface standard. It also contains less important information such as the module serial number and manufacturer code. When your computer powers up, it sets the row and column settings and the timings for the module based on the information in the SPD.

SPD is required in SDRAM that is 66MHz, PC100, and PC133 compliant. Standards set by Intel and JEDEC ensure that data is entered in appropriate locations so the motherboard BIOS can understand what this data means. The SPD standard allows greater flexibility for incorporating identification of new features and technologies on memory modules.