Hello,
DL-7xxx is a newer chipset family allowing higher refresh rates compared to DL-6xxx, hence 75Hz, 100Hz and above can be offered for higher resolutions, e.g. 4K. General rule of thumb is that DisplayLink devices filter out monitor modes outside of its supported spec, so the fact your monitors light up at certain refresh rate means all is good.
Some manufacturers of DisplayLink products don't always host the latest version of the drivers until they qualify certain version. That's why on Synaptics website you can often find newer version of the drivers.
Hope that helps.
Regards,
Szymon
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