I remembered from my study about the IRQ interrupts. I started to read how the interrupts work in Windows 10. I learned about the Message_Signaled_Interrupts. With the tool MSI_util_v3 (thanks to this article message-signal-interrupts-yes-or-no) lists the IRQ number, the type and priority of our peripherals. I discovered that my graphic card and my audio card were using the same IRQ numbers (16). I set the graphic card to use the "msi" type of interrupts: the liftoff distance. this is the number one win for steelseries. they had a liftoff distance as low as .5 mm lift off distance which I absolutely loved. the lowest for this mouse is 2 mm. so lifting and lowering there is mouse jottering I'm not a fan of but overall not a big issue. big win for steelseries here. On to the mouse, then. I have never extensively tested a regular Viper but I did review the Viper Ultimateand Viper Miniso I have some experience with the product line. What immediately caught my attention when I first grabbed the 8KHz is how much better the buttons feel. I had no problems with the first iteration of Razer’s optical mouse switches (at least not on the units that I got for review) but it couldn’t be denied that they felt a fair bit less crispy than actual mechanical switches, and it feels as if Razer has really been working on that aspect.

Under the hood, the Viper 8K has been upgraded with Razer’s latest Focus+ sensor. On paper, it’s a substantial bump in performance. The DPI has been boosted from 16K to 20K, the max speed has increased to 650 inches per second, and a quoted “industry best” accuracy of 99.6%. In practice, these upgrades won’t mean much to the average gamer (I couldn’t really feel them) but just might to competitive esports pros or those looking to break into the scene. This sensor also features Razer’s Motion Sync technology, which aligns the pulse of the mouse’s polling rate with the pace the host PC seeks updates to increase accuracy.

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The Razer Viper 8K Hz is a speed demon. Don't get me wrong; we're talking fractions of a second here, and most of us won't see a huge difference compared to previous editions. It isn't going to offer any benefit if you've got an older monitor, either. But it's a big deal for those who want to squeeze every last millisecond of speed from their gear. There's a reassuring feeling about your mouse being the fastest one out there, too.

Due to the different technologies that are inside the 8KHz it weighs just a bit more than it did when it first released with a max polling rate of 1000Hz. This one comes in at 71 grams. That puts it just above the ‘ultralight’ category (we consider every mouse that’s 70 grams or less to be an ultralight mouse) but of course it’s still an extremely respectable weight. As always I’d like to conclude this section with a disclaimer: I don’t know you, so I don’t know your preferences. You might have smaller hands and love large mice, or you might prefer super flat mice even with a palm grip. Always take these ‘grip and size recommendation’ portions by us reviewers with a grain of salt, as everyone is different. Buttons and Scroll Wheel Although I'd prefer it if the buttons not in use could be disabled via a simple press - as per the Corsair M55 RGB Pro - it's not a problem in most cases. As such, this could be a strong contender for the crown of best left-handed gaming mouse. Overall - should you buy it?VSyncTester’s HTML/JavaScript mouse input performance benchmark looks at mouse latency. Again, this test is subject to how consistently I can move each mouse, but the Viper 8K Hz managed the best score, usually in the 3.30ms range. The DeathAdder V2 Mini and Burst Pro were both typically in the 3.40ms area, not far behind. We've converted this review to Test Bench 1.5. This update adds a new Main Button test group, which provides button actuation data and switch information. We've also made minor changes to how we calculate the Office usage score. For more details, you can see our full changelog here.