The Alienware AW2521HFL is a FreeSync Premium gaming monitor, but its also compatible with Nvidia’s G-Sync Compatible mode. Its certification is delayed at this time, but it is pretty much guaranteed since the Alienware AW2521HF is already listed by Nvidia. Input lag sits at 3ms, so there is no need to worry about delays or de-synced instances. Thoughts on the Alienware AW2521HFL

Alienware 25 Gaming Monitor AW2521HF - Dell Support for Alienware 25 Gaming Monitor AW2521HF - Dell

It can also only reach 81.1% of the cinema-focused DCI-P3 color space. This isn't particularly high, and can result in dull colors when watching movies.The Alienware AW2521HFL is an excellent monitor overall with better imaging results over the dark gray-colored Alienware AW2521HF. It fares considerably better in color accuracy and brightness with minimal tweaking, but the calibrated results are identical. The monitor’s agile pixel response time and FreeSync/G-Sync compatibility make it a compelling choice for competitive gamers. The Alienware AW2521HFL offers 99% sRGB and around 82% DCI-P3 coverage so the screen is pleasantly vibrant with a balanced level of saturation. Its measured accuracy has a 1.56 delta average which is excellent for a gaming monitor and considerably better than the AW2521HF’s result. Do take note that color accuracy scores always vary between every unit due to manufacturing tolerances, explaining the massive difference between the two identical models. Input lag is where the Alienware 25 really shines, as it should in a gaming monitor. Using an HDFury Diva HDMI matrix, we measured a 4.1-millisecond input lag on a 60Hz signal, which means an input lag of just over 1ms at 240Hz. That makes the Alienware 25 the fastest gaming monitor we’ve tested to date. You will find the latter and two of the USB slots in a hub at the middle of the bottom bezel for easy access. It’s great that you don’t have to flip the monitor or blindly reach for the slots at the rear panel if in case you want to swap between your peripherals. The L standards for Premium. So the "HFL" is the Freesync Premium version. The "HF" is the standard Freesync.

Dell Alienware AW2521HF Review | PC Monitors

The Alienware AW2521HFL has a distinct design that reflects its branding, but what further emphasizes that is its AlienFX RGB lighting. The full span of the stand’s pillar has an LED ring that glows in any color or preset you like from the OSD or from the AlienFX app. It’s bright enough to cast a bias lighting glow if the monitor sits close to a wall, but what we didn’t like it cannot sync with other RGB ecosystems. It's definitely better than trying to fiddle with its Custom Colour preset, if only because each of its three Gamer profiles give you exactly the same level of control over its dozens of colour options. They're not particularly user-friendly, all told, and Alienware could probably do with chopping a lot of them to make the onboard menu settings easier to understand. Whereas most gaming monitors just give you easy RGB bars to adjust up and down, the AW2521HFL splits them into Gain, Offset, Hue and Saturation, and it's not immediately obvious which settings do what if you don't already know what those individual terms actually mean. Then again, my attempts at calibrating the Gamer preset to try and improve things further didn't actually yield the results I wanted (everything actually got a little worse), so they're probably best left alone anyway. The Alienware AW2521HFL has three main display outputs: two HDMI 2.0 ports and one DisplayPort 1.2 output. Dell claims the Alienware 25 can hit up to 99% of the sRGB color space. It comes close in our tests, but in Standard mode, the monitor only reaches 96.8% of the gamut, as shown in the sRGB color-space diagram below...It's not just colour settings you get on the AW2521HFL, though. There are also specific Sharpness, Response Time and Dark Stabilizer settings, the latter of which artificially brightens the screen to help you spot things in the shadows. It's a feature often touted as a 'must-have' for competitive multiplayer games to give you that extra 'edge' online - especially when said games are often the ones that can make the most of the AW2521HFL's 240Hz refresh rate. However, I found that the screen's regular peak brightness and accompanying contrast ratio from the Gamer preset was more than enough to help me see everything that I needed to in-game.