Documentation for this is wildly insufficient. The motherboard appears to be proprietary.  There's isn't a readily available data sheet (if there is one at all).  That means the power capacity of the PCI slot is unknown. Amongst other issues.The power supply /might/ be a TFX psu.  It cannot be easily replaced with an better one. It doesn't follow standard color coding for the power wires.  You can see white wires in the pictures I added. They metered out at 12v, not the -5v that would be expected. That makes it easier to engineer a DIY solution, as long as you're aware of it.It also might confuse a retail vendors if you're looking for an upgrade.In anycase, non-standard build and lack of detailed documentation (I did find the manual, it's not detained) is being applied to the tech support rating.It isn't a great gaming PC as delivered. The difficulty with upgrading the power supply, (which is needed to add a video card) makes it poor.Wife complained it didn't have sufficient graphics support for advanced zoom meeting effects.Consider it a web browsing, word processor.