The best PC gaming upgrade under $100 is the one that fixes a limitation you actually notice. More memory can help when your system runs short during games and multitasking; an SSD can make room for a larger library; a better-fitting mouse or keyboard can improve comfort. None of these changes replaces a major CPU or GPU upgrade, and peripherals cannot guarantee better performance. Start with the bottleneck, then check compatibility and current prices.
How to choose an upgrade that is worth the money
Identify the annoyance first: memory pressure, too little game storage, weak Wi-Fi reception, distracting fan noise, or an uncomfortable input device. Then choose the smallest change that addresses it. A headline specification does not prove an upgrade will help your particular PC, and the prices below are examples rather than guaranteed offers.
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- For internal components, verify motherboard support, available slots, physical clearance, and operating-system compatibility before ordering.
- For peripherals, prioritize fit, connection, and the features you will actually use over maximum specification claims.
- Recheck stock and pricing at purchase time. The named prices in this article are dated snapshots, not ongoing offers.
1. Add compatible memory if your PC runs short
More RAM is useful when your games and other open applications push the system beyond its available memory. It is not an automatic way to improve performance on a machine that already has enough for its workload. Before buying, check the memory generation, DIMM form factor, motherboard capacity and slot support, and supported speeds. Confirm whether you need a matched kit or can add modules compatible with what is already installed.
2. Add or replace an SSD for space or a supported boot-drive upgrade
An SSD can be a practical gaming upgrade even when your graphics card is not changing: a larger secondary drive makes room for more installed games. If replacing an older boot drive, speed and the operating system migration plan matter as well. Check whether your motherboard supports the drive’s interface and form factor—M.2 NVMe and SATA are not interchangeable, and PCIe generation sets an interface ceiling. For a game-library drive, capacity and price per gigabyte may matter more than top sequential-speed figures.
#1 Best Overall
- The next-generation optical HERO sensor delivers incredible performance and up to 10x the power efficiency over previous generations, with 400 IPS precision and up to 12,000 DPI sensitivity
- Ultra-fast LIGHTSPEED wireless technology gives you a lag-free gaming experience, delivering incredible responsiveness and reliability with 1 ms report rate for competition-level performance
- G305 wireless mouse boasts an incredible 250 hours of continuous gameplay on just 1 AA battery; switch to Endurance mode via Logitech G HUB software and extend battery life up to 9 months
- Wireless does not have to mean heavy, G305 lightweight mouse provides high maneuverability coming in at only 3.4 oz thanks to efficient lightweight mechanical design and ultra-efficient battery usage
- The durable, compact design with built-in nano receiver storage makes G305 not just a great portable desktop mouse, but also a great laptop travel companion, use with a gaming laptop and play anywhere
PC Gamer once reported a deal on a Lexar NM790 2TB NVMe SSD at $86.95, with advertised sequential speeds of 7,400MB/s read and 6,500MB/s write. That is an old deal example, not a current price or a claim that every PC can use the drive at those speeds. Verify compatibility and today’s listing before buying: PC Gamer’s deal coverage.
3. Choose a mouse that fits your hand and play style
A mouse upgrade can address an uncomfortable shape, unwanted weight, connection preference, or a shortage of useful buttons. Compare how the mouse fits your hand and grip, its weight and connection type, and whether its sensor and button count suit your use. Higher DPI figures alone do not establish that a mouse will feel better.
Rank #2
- HERO Gaming Sensor: Next generation HERO mouse sensor delivers precision tracking up to 25600 DPI with zero smoothing, filtering or acceleration
- 11 programmable buttons and dual mode hyper-fast scroll wheel: The Logitech wired gaming mouse gives you fully customizable control over your gameplay
- Adjustable weights: Match your playing style. Arrange up to five 3.6 g weights for a personalized weight and balance configuration
- LIGHTSYNC technology: Logitech G LIGHTSYNC technology provides fully customizable RGB lighting that can also synchronize with your gaming (requires Logitech Gaming Software)
- Mechanical Switch Button Tensioning: A metal spring tensioning system and metal pivot hinges are built into left and right computer gaming mouse buttons for a crisp, clean click feel with rapid click feedback
As a dated US-market example, Tom’s Hardware listed the Logitech G305 Lightspeed at $29.99 at Amazon on October 7, 2026. The listing described a Hero 12K sensor, 1,000Hz polling, and six programmable buttons. Its price and availability can change; see Tom’s Hardware’s deal roundup.
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4. Pick a keyboard for its layout and feel
Under $100, keyboards vary in size, switch feel, noise, and wired or wireless connection. A full-size board keeps the number pad; a compact layout saves desk space but removes keys or moves them behind shortcuts. Consider how the switches sound and feel in your room, and whether the layout suits your work as well as your games.
Rank #3
- Next-gen 12,000 DPI HERO optical sensor delivers unrivaled gaming performance, accuracy and power efficiency
- Advanced LIGHTSPEED wireless gaming mouse for super-fast 1 ms response time and faster than wired performance
- Ultra-long battery life gives you up to 250 hours of continuous gaming on a single AA battery
- Lightweight mechanical design and classic shape for maximum maneuverability, durability and comfort
- Compact, portable design with convenient built-in storage for included USB wireless receiver
Hall Effect switches and rapid-trigger features may be relevant to players who specifically want adjustable actuation behavior, but they are not essential for every game or player. Tom’s Hardware’s June 12, 2026 budget-keyboard guide includes picks around $50. PC Gamer’s June 26, 2026 roundup discusses a Hall Effect keyboard while noting its author had not personally tested that keyboard. Treat that product discussion accordingly rather than as a hands-on test: Tom’s Hardware’s budget keyboard guide and PC Gamer’s roundup.
5. Improve game audio or chat with a headset or IEMs
Choose an over-ear headset if you want an integrated boom microphone or prefer that fit. In-ear monitors can be a lower-cost alternative if you tolerate in-ear fit and do not need an integrated boom mic. Check connection type, comfort, and whether you want an open or closed listening experience. Audio gear may make communication or listening more convenient, but it does not guarantee a competitive advantage.
Rank #4
- ICONIC ERGONOMIC DESIGN WITH THUMB REST — PC gaming mouse favored by millions worldwide with a form factor that perfectly supports the hand while its buttons are optimally positioned for quick and easy access
- 11 PROGRAMMABLE BUTTONS — Assign macros and secondary functions across 11 programmable buttons to execute essential actions like push-to-talk, ping, and more
- HYPERSCROLL TILT WHEEL — Speed through content with a scroll wheel that free-spins until its stopped or switch to tactile mode for more precision and satisfying feedback that’s ideal for cycling through weapons or skills
- 11 RAZER CHROMA RGB LIGHTING ZONES — Customize each zone from over 16.8 million colors and countless lighting effects, all while it reacts dynamically with over 150 Chroma integrated games
- OPTICAL MOUSE SWITCHES GEN 2 — With zero unintended misclicks these switches provide crisp, responsive execution at a blistering 0.2ms actuation speed for up to 70 million clicks
6. Add a controller for games that suit one
A controller can be a more comfortable choice for controller-first genres, platformers, racing games, or couch play. Check the game’s controller support and the device compatibility you need, then compare layout, wired or wireless operation, and stick and trigger design.
Recommended Free Tools
PC Gamer’s August 11, 2026 deal roundup listed the wireless GameSir Nova Lite at $22.99 and described it with Hall Effect sticks and triggers. This is a dated deal snapshot; confirm the current price and that it works with your platform before purchase: PC Gamer’s controller deal roundup.
Best Value
- Pentakill, 5 DPI Levels - Geared with 5 redefinable DPI levels (default as: 500/1000/2000/3000/4000), easy to switch between different game needs. Dedicated demand of DPI options between 500-8000 is also available to be processed by software.
- Any Button is Reassignable - 11 programmable buttons are all editable with customizable tactical keybinds in whatever game or work you are engaging. 1 rapid fire + 2 side macro buttons offer you a better gaming and working experience.
- Comfort Grip with Details - The skin-friendly frosted coating is the main comfort grip of the mouse surface, which offers you the most enjoyable fingerprint-free tactility. The left side equipped with rubber texture strengthened the friction and made the mouse easier to control.
- 5 Decent Backlit Modes - Turn the backlit on and make some kills in your gaming battlefield. The hyped dynamic RGB backlit vibe will never let you down when decorating your gaming space, it would be better with other Redragon accessories with lights on.
- Fatigue Killer with Ergonomic Design - Solid frame with a streamlined and general claw-grip design offers a satisfying and comfortable gaming experience with less fatigue even though after hours of use.
7. Add Wi-Fi to a desktop that needs it
A PCIe Wi-Fi card may help a desktop that lacks a suitable wireless adapter, but the card is only one part of the connection. Check for an available PCIe slot, operating-system support, router compatibility with the wireless standard, and a place to position the antennas. A new adapter will not fix every weak-signal or internet-service problem. Tom’s Hardware’s 2022 article described Wi-Fi 6 and 6E cards below $100 at the time; those examples do not establish current prices or availability: Tom’s Hardware’s upgrade guide.
8. Improve CPU cooling when temperature or noise is the problem
An aftermarket cooler can be worth considering if CPU temperatures or cooler noise are a real issue. Match the cooler to the CPU socket and case: check cooler height, fan clearance, and, for a liquid cooler, radiator support and mounting space. Also account for installation requirements. Tom’s Hardware discussed air coolers and 240mm AIOs below $100 in its 2022 guide, but those are historical examples, not current buying recommendations: Tom’s Hardware’s upgrade guide.
Quick Recap
Make the final decision by matching the fix to the symptom
| What you want to fix | Upgrade to consider | Check before spending |
|---|---|---|
| Games and other applications run short on memory | Compatible memory | DDR generation, DIMM form factor, motherboard capacity and supported speeds |
| Not enough room for installed games | Secondary SSD | Supported M.2/NVMe or SATA interface, capacity, and value per gigabyte |
| Replacing an older boot drive | SSD | Drive support, interface ceiling, and operating-system migration |
| Uncomfortable or unsuitable mouse | Mouse | Shape, weight, connection, sensor, polling, and useful buttons |
| Uncomfortable layout or switch feel | Keyboard | Size, wired or wireless connection, switch feel and noise, and whether specialty features matter |
| Need an integrated microphone or different fit | Headset or IEMs | Fit, microphone requirement, connection, and listening preference |
| Prefer controller input or play from a couch | Controller | Game and platform support, connection, layout, sticks, and triggers |
| Desktop lacks a suitable wireless adapter | PCIe Wi-Fi card | PCIe slot, OS, router standard, and antenna placement |
| CPU cooling is too hot or noisy | Aftermarket cooler | CPU socket, case clearance, fan or radiator support, and installation |
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
