Pros & Cons
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- Ultra-high-resolution sensor
- Great ergonomics that will appeal to claw and fingertip grip styles
- Lightweight
- New web-based Razer Synapse utility works well
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- Expensive
- No left-handed version
Razer Viper V4 Pro Specs
| Hand Orientation | Right-Handed |
| Interface | 2.4GHz Wireless |
| Interface | Bluetooth |
| Interface | USB Wired |
| Number of Buttons | 4 |
| Power Source | Internal Battery |
| Sensor Maker and Model | Focus Pro 50K Optical Sensor Gen-3 |
| Sensor Maximum Resolution | 50000 |
| Warranty (Parts and Labor) | 2 |
| Weight | 1.7 |
Last year, Razer gave us the Razer DeathAdder V4 Pro, a substantial update to its venerable DeathAdder mouse line. Its lightweight build, high-resolution sensor, and updated Hyperpolling Dongle were just some of the updates that make the latest DeathAdder so good. Now, it's Viper's turn: The Razer Viper V4 Pro ($159.99) offers a significant boost in battery life, upgraded optical switches, and an improved sensor that reaches an impressive 50,000dpi. It’s a definite improvement over the already-excellent Razer Viper V3 Pro, which earns it our Editors' Choice award for esports gamers who like low-profile mice.
Design and Features: Getting the Right Grip
The DeathAdder V4 Pro and Viper V4 Pro look nearly identical upon first glance. You've got to hold them in your hands to identify the subtle design differences. The DeathAdder has a curve at the center of its body, which holds your hand in a more natural, ergonomic position—ideal for players with larger hands who prefer a full palm grip—whereas the Viper is flatter and lends itself to claw- and fingertip-grip styles. It’s sort of like choosing a flat shoe versus a heeled one, a decision guided by preference and comfort.
(Credit: Zackery Cuevas)A detailed comparison with the Viper V3 Pro is in order to better illustrate the fourth-generation improvements. First, the optical switches have been upgraded. According to Razer, these new switches deliver even stronger competitive performance, feature a 100-million click lifecycle, and have 12% lighter actuation for cleaner, faster clicks. While 12% doesn't seem like a lot, the lighter actuation point means that your hands won’t tire as easily during marathon gaming sessions.
What I like about the Viper V4 Pro’s new switches is that they provide plenty of tactile feedback. It might just be my hands playing tricks on me, but I feel like the switches are even more tactile than those on the DeathAdder V4 Pro, which feels more hollow in comparison. (This is weird, because both mice actually use the same switch.) I still appreciate the benefits of optical switches over mechanical ones, though. Optical switches actuate via light rather than metal contacts. This removes debounce delay, prevents mechanical wear, and eliminates issues like accidental double-clicking. Optical switches are not new to the DeathAdder V4 Pro; we've seen them in older mice like the Logitech G502X Plus.
(Credit: Zackery Cuevas)The next noteworthy upgrade is to the sensor. The Viper V4 Pro comes equipped with a new sensor that offers a maximum resolution of 50,000dpi, a big bump over the Viper V3 Pro's 35,000dpi ceiling. Higher resolutions—measured by how many pixels a cursor moves on the screen for every inch the mouse physically moves—mean a more sensitive (i.e., faster) mouse. This is the highest resolution I’ve seen on a mouse I’ve reviewed, though other Razer mice have come within striking distance, like the DeathAdder V4 Pro’s 45,000dpi ceiling.
The drawback of faster movement is less precision. If you’re playing a game that requires quick flicks of your wrist, the higher resolution can definitely help. But I don't believe that sky-high resolutions like this make a significant difference in overall game performance, even though I appreciate that the range on the Viper V4 Pro gives you plenty of room to experiment.
Most premium gaming mice let you adjust sensor resolution, but the Viper V4 Pro takes things a step further: It lets you customize your sensitivity by 1dpi at a time, rather than just select from a few presets. It also lets you adjust the sensor's tracking angle so horizontal swipes stay straight, regardless of grip style. This and more can be tweaked in Razer’s software utility, Razer Synapse (more on that later in the review).
(Credit: Zackery Cuevas)Back to the mouse’s design: It’s classic Razer through and through. While the Viper V4 Pro lacks RGB lighting, the shell is remarkably similar to previous models. The mouse weighs 1.7 ounces and measures 1.6 by 2.5 by 5 inches (HWD). I tested the white color scheme, but black is available as well. Two extra buttons sit on the left side of the mouse, easily accessible with your right thumb. Sorry, lefties, this is a right-handed mouse only.
Between the mouse’s primary clickers is the optical scroll wheel. As with the DeathAdder V4 Pro, the Viper V4 Pro’s optical wheel is 3.3 times longer than mechanical scroll wheels, Razer says, thanks to its lack of physical contact points. In testing, the scroll wheel was accurate, and I never missed an input or had an accidental movement, whether I was scrolling through my gear in-game or scrolling down a web page.
(Credit: Zackery Cuevas)I’m not a pro gamer, so I spend more time playing Peak and RV There Yet? than Marvel Rivals. But whether I was falling off a cliff or escorting a chariot from point A to B, the mouse felt great in my hand. This is despite my personal preference for the DeathAdder V4 over the Viper V4 because of how I grip my mouse. The Viper V4’s lightweight body makes it an easy recommendation for fans of shooters, though.
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Connectivity: 8,000Hz Wireless Polling Rate
Like the DeathAdder V4 Pro, the Viper V4 Pro comes with the Hyperpolling Wireless Dongle. The dongle features a sleek hemispherical design. It not only looks good, but the wider body also adds a bit of weight, helping keep the small device grounded on your desktop.
(Credit: Zackery Cuevas)This dongle utilizes Razer’s HyperSpeed Wireless Gen-2 technology, which Razer claims is 63% more power-efficient and delivers 37% lower latency than the previous generation. This helps the Viper V4 Pro achieve an average latency of just 0.29ms, Razer claims.
The dongle also ensures that the Viper V4 Pro can achieve its maximum polling rate of 8,000Hz, even over a wireless connection. Polling rate is the frequency at which the mouse reports its position to the computer. An 8,000Hz polling rate means it reports 8,000 times per second. High polling rates might seem like something that only hard-core crowds can appreciate, but even casual players like me can notice a distinct improvement in responsiveness. The mouse is capable of 8,000Hz in wired mode as well.
What is it not capable of? The Viper V4 Pro does not support Bluetooth.
(Credit: Zackery Cuevas)Like the DeathAdder V4 Pro, the Viper V4 Pro can utilize the Smart Polling Rate Switcher, which automatically adjusts polling rates, so you can crank it to 8,000Hz during gameplay and drop back to 1,000Hz when you're just browsing the web to save battery life. And battery life is something you’ll want to consider: the DeathAdder V4 Pro is rated for 180 hours at 1,000Hz, but only 45 hours at 8,000Hz. That’s an improvement over the DeathAdderV3 Pro’s 95 hours at 1,000Hz and 17 hours at 8,000Hz, but it comes up short when compared with the DeathAdder V3 HyperSpeed’s 280 hours at 1,000Hz and 50 hours at 8,000Hz.
Software: Synapse Gets a Web App
Polling rate and many other features are adjustable using Razer Synapse, Razer’s downloadable software utility. If you're a hard-core gamer, you are probably already well aware of what you can do in this app. For the uninitiated, it is where you’ll create macros, adjust DPI presets, and access the mouse’s many other features, including the aforementioned Smart Polling Rate Switcher.
Much of this should be familiar to anyone who has used Razer gear over the last few years, but what is new is the Razer Synapse web app. Released earlier this year in beta, the browser-based app provides all the features you’d find in the full download, without the need to, well, actually download anything. The idea is that the app lets you make on-the-fly adjustments without installing software.
(Credit: Razer)It is compatible with Chromium-based browsers, such as Google Chrome, Microsoft Edge, and Opera. It didn't seem to have any issues running in Brave in my testing, unlike Corsair’s web app, which refused to even open in Brave. For the most part, it works well. Some Synapse options, like managing macros and Razer Exchange, are not available, but on-hardware adjustments like performance, power, and calibration options are available to tweak, as are advanced options like Dynamic Sensitivity and Rotation.
You can’t use the web app at the same time as the installed instance of Synapse, which makes sense. But for some reason, the web app always thought I was running the desktop version of Synapse even when it was closed. This happened across multiple browsers, and the only thing that cleared it up was a full uninstall of Synapse.