240hz on the 57" Odyssey G9 with ASUS RTX5080 ROG Astral OC ? | TechManPat

240Hz support for the 57-inch Odyssey G9

The main focus of the video is the Samsung Odyssey G9 57-inch monitor. Previous Nvidia cards, including the RTX 4090 mentioned in the video, were limited to 120Hz at the monitor’s native resolution. The RTX 5000 series is described as the first Nvidia generation able to run the display at 240Hz natively from the outset.

The monitor’s firmware and Nvidia drivers need to be up to date. Enabling the display mode does not mean every game will produce 240 frames per second, however. Pat says the RTX 5080 is not expected to reach that level in modern AAA titles at the monitor’s demanding resolution. Competitive games such as CS:GO, along with older games, are more likely to take advantage of the high refresh rate.

Gaming performance and DLSS 4

The card is based on Nvidia’s Blackwell architecture and includes 16GB of GDDR7 memory. The review discusses high-end 4K gaming and 8K workloads, while noting that 8K rendering without DLSS 4 does not provide a playable frame rate.

In the reported comparisons, Hogwarts Legacy at 4K ultra with ray tracing and DLSS reached about 72 frames per second on the RTX 4080 and 94 frames per second on the RTX 5080 using the same settings. In Cyberpunk 2077 with RT Overdrive, the RTX 4080 struggled to remain above 60 frames per second at native 4K, while the RTX 5080 was reported at around 80 frames per second with frame generation enabled.

The review attributes some of the smoother results to DLSS 4 frame generation and improved AI-assisted upscaling. These generated frames can improve perceived fluidity, although the video acknowledges that some users may not prefer this approach.

Cooling, size and power requirements

The ASUS ROG Astral RTX 5080 OC uses a large triple-fan cooling design, with the review also referring to a vapour chamber and dense fin-stack heatsink. During the reported testing, core temperatures were in the low 70s under full-load burn-in, while noise was generally around 35–38dB. The fan curve was described as smooth, with effectively silent idle operation.

Under full load, the card was reported to draw approximately 380W. It uses a single 16-pin 12VHPWR connector and includes an adapter that splits to three 8-pin plugs. An ATX 3.0-compliant power supply is recommended for cleaner cable management; otherwise, the included adapter can be used. The card’s size also makes the supplied sag support important for horizontal installations.

Who should consider the RTX 5080?

The review positions the RTX 5080 as a high-end option for 4K gaming, real-time 3D work, video production and AI-assisted workloads. The 16GB of VRAM is described as suitable for 4K video work, gaming and generative AI, although workloads that require more memory may need a card with greater capacity.

The reported gains over the RTX 4080 were generally 20–30% in the tested AAA games. Even so, the video does not recommend upgrading solely from an RTX 4080 or from a 4090 to gain access to 240Hz on the Odyssey G9, because the older cards were already capable of delivering a satisfactory experience at 120Hz and the newer card will not produce 240 frames per second in most demanding AAA games.

At an indicated price of approximately AU$3,499, the ASUS card is positioned as a premium purchase. The price reflects its performance, cooling and newer features, but represents a substantial cost for buyers upgrading from a recent high-end GPU.