EVGA 122-CK-NF68-XX ‰ RAS to RAS Delay, ‰ Refresh Rate, ‰ Memory bank switch, ‰ R to W Turnaround

Installing and Configuring the EVGA nForce 680i SLI Motherboard

‰RAS to RAS Delay

The RAS-to-RAS delay (tRRD) is the is the amount of cycles it takes to activate the next bank of memory (this is the opposite of tRAS). The lower the timing the better the system performance. However, this scenario can cause instability. Adjustable from 1 to 15.

‰Refresh Rate

This value is filled in by the system and can not be changed by the user.

‰Memory bank switch

The row Precharge time (tRP) is the minimum time between active commands and the read/writes of the next bank on the memory module. Adjustable from 1 to 15.

‰R to W Turnaround

The Read-to-Write turnaround (tRWT) is a the amount of cycles for the command to be executed when a Write command is received. Adjustable from 1 to 15.

‰R to R Timing

the Read-to-Read time (tRDRD) is the number of clock cycles between the last read and the subsequent READ command to the same physical bank. Adjustable from 1 to 15.

‰Row Cycle Time

The Row Cycle Time is the minimum time in cycles it take a row to complete a full cycle. This can be determined by tRC=tRAS+tRP. If this value is set too short, it can cause corruption of data. If this value is set too high, it causes a loss in performance but an increase in stability. Adjustable from 1 to 63 cycles

‰W to R Command Delay

The Write-to-Read (tWRD) command delay is the amount of cycles required between a valid write command and the next read command. A lower cycle time results in better performance but is can instability. Adjustable from 0 to 6 cycles.

‰W to W Timing

The Write-to-Write (tWRWR) timing is the number of clock cycles between the last write and the subsequent Write command to the same physical bank. Adjustable from 2 to 15 cycles.

‰CAS Latency

The CAS Latency (tCL) is the time (in number of clock cycles) that elapses after the memory controller sends a request to read a memory location and before the data is sent to the module's output pins. The value shown cannot be changed.

xx