http://www.techpower..._GT_520/27.html The video card sucked when it first came out in 2011. http://www.amazon.co...p/dp/B005TJKGTM Looking at this spec page tells me the PC's video card should be upgradable. "1 ( 0 ) x pci express x16" The CPU is descent low-end but I am not sure how well it will play ARMA/DayZ. Probably okay on Low detail to maintain a descent frame rate. Whatever PC you buy, make sure you get at least 14 days/30 days to use and return it without penalty. You want to know that it it will serve your needs before committing to it. Walmart.ca gives you 14 days with a PC. I dont see any mention of restocking fees so beware. I've had good experiences with returning PC parts at BestBuy USA, but I have never bought/returned a desktop PC. Newegg.com gives 30 days to return with a possible 15% restocking fee. Also, make sure the PC has an open PCI-Express slot because most "Gaming PCs" below the $600 price point come with video cards that are absolute shit. For $800 this machine is a bit better in terms of CPU/RAM/VIDEO. I don't know much about that brand of PC though. The "Cyberpower" name gives me a Dell/Acer/HP vibe but I con't comment on the quality of their machines. http://www.newegg.co...N82E16883229335