DRAM Read Latch Delay
Common Options : Enabled, Disabled
This BIOS feature is similar to the Delay DRAM Read Latch BIOS feature. It fine-tunes the DRAM timing parameters to adjust for different DRAM loadings.
The DRAM load changes with the number as well as the type of memory modules installed. DRAM loading increases as the number of memory modules increases. It also increases if you use double-sided modules instead of single-sided ones. In short, the more DRAM devices you use, the greater the DRAM loading.
With heavier DRAM loads, you may need to delay the moment when the memory controller latches onto the DRAM device during reads. Otherwise, the memory controller may fail to latch properly onto the desired DRAM device and read from it.
The Auto option allows the BIOS to select the optimal amount of delay from values preset by the manufacturer.
The No Delay option forces the memory controller to latch onto the DRAM device without delay, even if the BIOS presets indicate that a delay is required.
The three timing options (0.5ns, 1.0ns and 1.5ns) give you manual control of the read latch delay.
Normally, you should let the BIOS select the optimal amount of delay from values preset by the manufacturer (using the Auto option). But if you notice that your system has become unstable upon installation of additional memory modules, you should try setting the DRAM read latch delay yourself.
The amount of delay should just be enough to allow the memory controller to latch onto the DRAM device in your particular situation. Don't unnecessarily increase the delay. Start with 0.5ns and work your way up until your system stabilizes.
If you have a light DRAM load, you can ensure optimal performance by manually using the No Delay option. If your system becomes unstable after using the No Delay option, simply revert back to the default value of Auto so that the BIOS can adjust the read latch delay to suit the DRAM load.
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