None of the newer models 7040 7050 7060 7070 7080 etc have upgrades or a REAL tower case. Dell has reverted back to proprietary motherboards and cases and fans etc making upgrading newer models impossible.  I tend to stay away from any model that has the non standard power and front panel built into the motherboard with non standard cooling and power etc. Larger cases and power solutions are restricted to the Precision Line having 6 or more slots and over 1000W power options. I recommend Precision T1700 tower or 3620 Tower.  GPU upgrades for these models is RTX 4000 card which fits in the mini tower case when the PSU is upgraded to accommodate the card. Even without PSU upgrade Quadro K2200 works fine.  
Hello Friends With the Optiplex line designed for 'Business Use' and along with changing times, the enclosures are getting smaller. If one prefers a larger case, (minimizing the battle to fit/adjust component upgrades), then I wonder how other models fit into the picture? PowerEdge, Precision Workstations, Vostro, Inspiron and XPS Desktops? I might be wrong, but some of these appear more expensive? I've preferred slightly older Optiplexes (for their value and versatility). With sufficient memory, even moderate video and audio editing is possible with an Optiplex. Specifically, does anyone know if the 7050 QUAD Core i7-7700 3.60Ghz is available in anything larger than a Mini Tower? I'm happy with it, (got it for a great price) but its quite smaller than my old 790 Mini Tower. Just curious ... Thank You  
Optiplex Enclosure Size as Technology Advances