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DRAM Speed / DRAM Timing / DRAM Auto Configuration
There are a number of settings that control the timing of your system memory. For a full discussion on system memory timing, look here. Most setup programs now come with some sort of "automatic" setting that will determine what these parameters are for you. This is a "parent" setting of sorts that can be used to control the other individual timing settings on the screen. These parent settings normally come in one of two flavors:
When you use the "Auto" setting (either fully automatic or by selecting a memory speed) the BIOS will normally "lock" the individual settings that are controlled by this one, to reflect the fact that they are being set automatically by the BIOS. To unlock the individual settings so you can change them, you normally must turn off the "Auto" setting, or select "Manual". The default in most BIOSes is to enable automatic timing settings.
Warning: In a system that
dynamically sets timing based on the detected speed of your memory, you must take care when using memory of different
speeds. You should generally put the slower memory in the first bank, often called
Bank 0. Otherwise, the system may set the timing too fast for the slower chips.
Next: DRAM R/W Leadoff Timing