Resolution issues

[Zourous]

I have an iMac (late 2013) running W7 and a smart e70 touchscreen both capable of 1920 x 1080 resolution. They are linked together with a thunderbolt (I think) to vga adapter, then a short vga into a interface box and finally a 10m vga cable to the touchscreen. The highest resolution I can get to work is 1600 x 900. This isn't a real problem, but I'd love to know why I can't get 1920 x 1080 if anyone knows??

[3s-gtech]

I'd guess that you have hit a limit on bandwidth, either through the interfaces you've put together or the cables themselves. Can you simplify the link at all?

[Zourous]

I could run it loose as a test I guess.