I'm a (brand new) school tech coordinator looking to upgrade our pc labs. Looking at all-in-one desktops, specifically from Dell (contract). Gray area for me are new online standardized tests that are graphic heavy/intense - this gave us issues with our current Optiplex 360 sets (older I know) - constant freeze ups, etc. Other than memory, chipsets/processors, anything else I should consider in determining which to purchase? Looking at Dell Optiplex 3011 AIO and Dell Optiplex 9020 AIO. I'm new to the game, so any advice is welcomed! Thanks!