That said, notebooks aren't upgradable, apart from their primary system memory (RAM, not to be confused with the graphics memory) and in some cases, the storage. You're going to be stuck with the screen, the graphics chip, and the processor you buy now, so evaluate these parts wisely. If you can stretch your budget a bit to get the next-tier-higher component, it can pay dividends in terms of usable life.

In addition to poring over our reviews and checking out the vendors' sites, using the price filters at a reseller like Newegg.com can help you see different configurations at different price points. Some manufacturers offer lots of differently weighted versions of the same laptop (say, more storage in one config, a better GPU in another). Playing with the filters on these sites can be an illuminating exercise in give-and-take.
Stefan Vazharov and Brandon Carte of Best Products featured the Logitech G613 LIGHTSPEED Wireless Mechanical Gaming Keyboard and the Logitech G903 LIGHTSPEED Wireless Gaming Mouse in their guide to “60+ Gifts for Gamers to Level Up Their Experience.” They shared that “the G613 wireless mechanical keyboard by Logitech is an excellent way to make your favorite people better gamers, as well as more effective typists." They additionally noted that the Logitech G903 is a “solid contender for being the best of its kind, it features pro-grade performance in wireless and wired mode, ambidextrous design with customizable buttons and lighting (via a software suite), and excellent 20+ hours of battery life.”
If you want our top recommendation, it's the Razer Mamba Tournament Edition (available at Amazon). This mouse strikes a perfect value stance between price and pedigree, delivering professional polish for a very attractive price. We tested a dozen of the top-selling and top-rated mice from leading gaming brands, and while the Mamba Tournament Edition doesn't deliver the most buttons nor the widest feature set, it's the sturdiest, sleekest, and best-feeling pick in the bunch.
The Acer Aspire E 15 E5-575-33BM  is currently our top recommended gaming laptop under $500. It features integrated Intel HD Graphics 620 graphics powered by the latest Intel i3 Kaby Lake processor and next generation connectivity such as USB 3.1 Type-C and Bluetooth 4.1. Despite weak gaming performance for most modern games,  it holds its own with an unbeatable price to performance ratio compared to its competitors, clocking in at a $100 or more cheaper than many similarly specced laptops such as the Inspiron I3567 and HP Pavilion 17 1BQ14UA below.
There are also advanced features you won't find in a regular mouse. Look for additional buttons that can be programmed for specific PC games. Many gaming mice — both optical and laser — offer multiple DPI (dots per inch) settings to control the sensitivity, and some of them even allow you to adjust the DPI on the fly, so you can switch between settings without pausing your gameplay. And not only are these models the coolest mice when it comes to their standard look, a growing number of gaming mice boast RGB lighting for customizable effects in millions of colors.

However, there is one important thing a lot of gamers don’t know. Buying a gaming mouse doesn’t necessarily mean that your skills will improve by a drastic measure. Sure, a gaming mouse might help you in some ways, but if you are buying it just for the sake of improving your skills, then you are wrong. In case you don’t know, most professional, e-sports gamers are actually winning all the competitions without the use of a gaming mouse, and yes, it does come as a shock, but they have actually gone on the record and stated that they prefer a standard mouse better simply because they are used to it.
Updated Nov. 25 at 5:45 a.m. ET: You can snag some inexpensive gaming laptops for great prices through Cyber Monday. The Lenovo Legion Y530 is on sale for $100 off from Best Buy, while the 15.6-inch Dell G3 can be had for $649 from Walmart — a savings of $350. The Dell G5 is also on sale for $899 from Walmart ($400 off!) A sale at eBay knocks the MSI GL63 down to $969, for a savings of $229. Check out our Cyber Monday hub for more fantastic deals. 
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