For RTX 4090 owners looking for the perfect monitor, I'd strongly recommend considering the BenQ MOBIUZ EX3210U. It's a 32" 4K display that really lets the 4090 stretch its legs with a 144Hz refresh rate and HDMI 2.1 support. The IPS panel with DisplayHDR 600 and 98% DCI-P3 coverage means you're getting fantastic color accuracy and decent HDR performance.

However, if you're more focused on competitive gaming, the Alienware AW2723DF might be the better choice. While it's "only" 1440p, its 240Hz refresh rate (OC to 280Hz) paired with the 4090's raw power means you'll get incredibly smooth gameplay. The 1ms response time is great for fast-paced games too.

For ultrawide enthusiasts, the Alienware AW3423DW is hard to beat. The 175Hz refresh rate and 3440x1440 resolution hit a sweet spot for the 4090, and the 0.1ms response time is incredible. The 21:9 aspect ratio is perfect for immersive gaming.

Really, the choice comes down to your priorities - maximum resolution, highest refresh rate, or ultrawide immersion. The 4090 can handle any of these options with ease, so you can't go wrong either way.

Alienware AW3423DW is the top choice.

PG32UCDM: https://www.amazon.com/ASUS-Swift-Gaming-Monitor-PG32UCDM/dp/B0CV26XVMD?tag=7649-20

For those who crave an ultrawide experience, the SAMSUNG Odyssey G85SB is a stellar ultrawide monitor. With its high refresh rate and immersive aspect ratio, it pairs well with the RTX 4090

PG32UCDM or PG32UCDP.

For 4K gaming, the BenQ MOBIUZ EX3210U and ASUS ROG SWIFT PG32UQX are excellent choices, offering high refresh rates and stunning visuals. If you're looking for a more budget-friendly option, the Gigabyte M28U provides great performance at a lower price point. For competitive gaming at 1440p, the Gigabyte M27Q-X and Alienware AW2723DF are top contenders.