The GPU question would also affect the answer to your question of how many total displays you can run. That depends on whether you have a first or second generation dock, and for an E5570 it also depends on whether you have an Intel GPU or an AMD GPU in your particular configuration. However, be aware that your intended display setup has to be within the display bandwidth available from the system to the dock. I've personally done a triple 1920x1200 setup with this dock variant by having a two-display daisy chain running from DisplayPort #1 and then connecting the third display to DisplayPort #2 (for some reason I never got a three-display daisy chain to work, even though technically it should have.) If you have a second generation E-Port Plus, the same options I described above apply, with the same additional option I mentioned earlier about running multiple displays from a single DisplayPort output. You can however use one port from each bank plus the VGA output. You can use output in each bank in any combination, but you can't use two outputs in the same bank. Notice that the two DisplayPort and DVI ports are grouped into two marked "banks", each bank containing one of each port. If you have a first generation E-Port Plus dock, you can run up to 3 displays just from the dock. The advantage to doing this rather than putting one display on VGA would be that DisplayPort can support higher resolutions (VGA maxes out at 1920x1200) and it also looks better at any resolution because VGA is analog, whereas everything else is digital. If you have a second generation E-Port dock, then you can run two displays the same way as above, and you have the additional option of running multiple displays via DisplayPort, either by using daisy chaining if you have displays that support that or else by using a DisplayPort MST hub. You cannot use the DVI and DisplayPort outputs simultaneously. If you have a first generation regular E-Port dock (non-Plus), you can run up to two displays, but for dual displays one of them must be VGA. The USB ports on the left side are always black and always 2.0. If they're black, the dock only supports USB 2.0 and DisplayPort 1.1. If your rear USB ports are blue, the dock supports USB 3.0 (on those blue ports) and DisplayPort 1.2. And then there are first and second generation models of each. If you only have one of each, you have the regular E-Port. If you have two DVI and two DisplayPort outputs, you have an E-Port Plus. First, there's the E-Port and E-Port Plus. But to properly answer your questions, it's important to understand that there are four variations of that dock model. The friendly name of that product is a Dell E-Port Docking Station.
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