CRU / Dell P2720D / pixel clock / add monitor data

[sempronius]

Another question in this context, maybe...

Since I am still a little worried about using a pixel clock higher than the max pixel clock of 280 MHz (2560x1440@74Hz) I thought about playing games in a lower resolution (1920x1080@74Hz) but using (outside of games) a desktop resolution/refresh rate of 2560x1440@60Hz. - At 1920x1080@74Hz the pixel clock is lower.

I would like to use nvidia's "no scaling" option, though. So I would be playing at a size of 1920x1080, at a refresh rate of 74Hz, but without scaling 1920x1080 to fullscreen; instead I would have black orders, but a sharp image (just like my desktop at 2560x1440)!

Now what I would like to know:
In this scenario (kind of: "1920x1080" inside "2560x1440"), what pixel clock do I have: the one of the 2560x1440 desktop resolution - or in fact the lower pixel clock of a 1920x1080 resolution?


By the way, a less important question:
Why can't my monitor (Dell P2720D) do "display scaling", only "GPU scaling" works, whilst another monitor (HP 27xq) can do both?