I did extensive research to buy this computer for my brother's family in April 2020.  It came with 8GB of RAM occupying one of the two RAM slots, and I bought an identical 8GB stick of DDR4 RAM (see below for more information) to fill the second open slot for a total of 16GB.  I figured having 16GB is a good idea for when users like to keep a bunch of browser tabs open and/or for playing games like ROBLOX that the kids love.  Also, it can't hurt for future-proofing.  Oh, and speaking of future-proofing, this thing came with a 512GB M.2 NVME SSD (made by Western Digital) and it is FAST - see the picture I included of the CrystalDiskMark transfer speeds.  Basically, this "new" type of drive uses the faster PCI Express 3.x lanes (I believe in this case it is 2 lanes) instead of SATA.  This drive is about the size of a stick of gum, has no moving parts, is mounted directly on the motherboard, and therefore leaves both of the hard drive bays open for installing (bottom mount 2.5") SSD or mechanical drives in the future.  If you order a drive(s) to put in these expansion bays, make sure they are 2.5" and NOT 3.5" because of the dimensions of the mounting holes.  For what it's worth, I found 4 screws included in the drive-mount platform, but they are too large for 2.5" drives.  I'm guessing they are for larger 3.5" drives but I couldn't see a way to mount those larger drives with the holes provided.  I have no clue what that is about, and suppose somebody in the Acer design department just messed up.Because my brother likes to save money on electricity, his house isn't exactly a cool room temperature during the summer.  Therefore I decided it was best to purchase and install a case fan.  It is IMPORTANT to note that the motherboard header used to connect the fan doesn't supply enough voltage to run a standard 12 volt 92mm case fan.  I found this extremely odd, since the vast majority of fan headers are pushing 12 volts.  I tried a 12 volt fan and it would only work for a couple seconds at computer startup.  Oh well, it is what it is, and there IS a solution.  I purchased a 5 volt fan and it works like a charm.  Keep in mind that it will run constantly while the computer is on, and only at one speed since there is no way to use the BIOS to manipulate a case fan in any way.  The particular fan I recommended (see below for more information) only makes a noticeable noise for 1-2 seconds when the computer starts up or resumes from sleep - other than that I can't hear it at all.IMPORTANT TO KNOW ABOUT CASE FANS: According to what I have read, if you install a 12 volt fan to a motherboard only pushing enough voltage to power a 5 volt fan, then the fan basically won't run (or at least won't run properly) and there is probably no harm done.  However, if you REVERSE the scenario and put a 5 volt fan on a 12 volt source, you will melt the fan motor in short order (somewhere between a few seconds and maybe 20 minutes) and destroy the fan.  I'm not sure if there would be a risk of fire, but why take that chance?  The 5v fan on a 12v header shouldn't apply to this computer, so don't worry about it at this point.  The only reason I mention it is in case you purchase a 5 volt fan for this computer, and then try to re-purpose it in another computer (which might likely have 12 volt headers) at some point in the future.  Often, it is difficult or impossible to find the fan header voltage for a particular motherboard online, especially if it is in one of these pre-made systems.  So, in my opinion, if you are unable to determine the motherboard header voltage try a 12 volt fan before trying a 5 volt fan.CASE FAN I RECOMMEND: https://www.amazon.com/Noctua-NF-A9-5V-PWM-Premium-Quality/dp/B07DXTN515/ref=sr_1_9?crid=3DGSXUZPNMEQD&dchild=1&keywords=noctua+5+volt+fan&qid=1590449172&s=electronics&sprefix=noctua+5+v%2Celectronics%2C172&sr=1-98 GB RAM THAT MATCHED WHAT CAME IN MY DESKTOP (It will really only run at 2400 MHz instead of 2666 MHz because my processor is an i3, and I'm perfectly okay with that): https://www.amazon.com/gp/product/B00XLXWD5S/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=12TB WD 2.5" Hard Drive (I don't want to clog up the fast NVME drive with all my documents, pictures, and videos.  You will likely need to get your own mounting screws since the 4 screws included with the main PC are the wrong size.  That is weird.): https://www.amazon.com/gp/product/B079BQS5WQ/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1In conclusion, I bought this PC, and added 8GB of matching RAM to make 16GB total, a 5 volt case fan, and a 2.5" mechanical hard drive for all my files, and a 27" Dell 1080p monitor.  For everyday computing, this thing is a beast.  Ultimately, I'm in for $420 for this PC, $39 for the extra RAM, $79 for the extra hard drive, and $200 for the monitor.  When tax is included, my total investment is just under $800.  I think that is pretty darn reasonable for this system which should provide many years of excellent performance.  I hope you found my review helpful, and wish you good fortune in all your endeavors.  Peace!