I got this PC for about $175, which I think is a great value.  The example I got came with Windows 10 Professional already activated, and the Refurbished PC Activation Code correctly stamped on the case.  I do quite a bit of tinkering inside my PCs; here are my notes:-the Intel Core-i5 3470 processor is a pretty old vintage, about 2012 if I remember correctly.  This is the reason why this PC is so cheap, because this is the component you won't be able to swap out.  It's not a bad processor at all, and the attached fan was pretty quiet.-it shipped with 8gb of PC3-12800 RAM in 3 DIMMs, with the motherboard having a total of 4 DIMMs.  This means as long as 1 DIMM remains empty you can easily expand the RAM to 16gb for $30-40, just search for "PC3-12800" and buy an 8gb stick.  I did find the plastic housings on the DIMMs to be pretty brittle and difficult to work with - I damaged one of them during install, and the RAM will not seat correctly without the plastic housings.  Be careful when you are installing RAM, as it will be easy to break the plastic housings.-The main limitation for gaming:  my example shipped with a Dell 275W power supply, and there is not a ton of room in the case for a larger power supply due to the mechanism attached to the case which helps it snap closed.  I tried to install a 1000W brick and it would not fit.  Either try a smaller PS (maybe 500W?) or use a lower power consumption graphics card.  I installed a mid-level GTX into the PCI-E port and it works fine with the stock 275W brick.  If your graphics card requires additional 6-pin power from the supply, you will not be able to use the stock 275W supply at all.-additional free bays for PCI, SATA, and optical readers/writers.  The supplied optical DVD drive will read but not write.Overall it's a great PC for tinkering, as long as you know the limitations beforehand.  You are not going to make a top notch gaming rig out of this PC, but if you can find a better power supply that will fit in the case, you can game with this.