Custom Resolution Utility (CRU)

[ToastyX]

(04-09-2014 06:44 AM)monitor Wrote:  Yes iv seen in this thread people lowering the blanking/total values to reduce the pixel clock and acheive higher refresh rates. What im needing explained is what the front porch, sync width, back porch, blanking and total values are and if a higher or lower number is best. Is increasing the pixel clock beneficial and what is the pixel clock limit.

The front porch is the period before the sync pulse. The sync width is the length of the sync pulse. The back porch is the period after the sync pulse. There are no "best" values for those parameters. The actual values don't matter much with most LCD monitors. Just use whatever works with the monitor.

The blanking is the period between each line and frame that includes the front porch + sync width + back porch. If you want to reduce the blanking, you'd have to reduce at least one of those values. CRU changes the back porch if you change the blanking or total values. The total is the active + blanking.

The pixel clock is the total number of pixels per second: horizontal total * vertical total * refresh rate. If you were trying to get higher refresh rates and the standard values weren't working, you'd want to try lower blanking/total values to reduce the pixel clock. Increasing the pixel clock is not beneficial because it wastes bandwidth and can cause signal quality problems if the hardware or the cable can't handle it.

I don't know what you're trying to do because you're not trying to get higher refresh rates and the standard values work with your monitor.