RTX 4090 vs RTX 4080 Super: Which Graphics Card Should You Buy?

The RTX 4090 is the faster card, roughly 25% to 33% ahead of the RTX 4080 Super at 4K and with 24 GB of VRAM instead of 16 GB, so it is the pick for uncompromised 4K, heavy ray tracing and AI or creative workloads; the RTX 4080 Super is the better value for most gamers, especially at 1440p, where the gap narrows to around 15% and the 4080 Super saves 130 W of board power and a large amount of money. The newer RTX 4080 Super is not an upgrade over the RTX 4090; it is a cheaper, slower card from the same Ada Lovelace generation.

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#1 Pick

VIPERA NVIDIA GeForce RTX 4090 Founders Edition Graphic Card

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#2 Pick

ASUS ROG Strix GeForce RTX 4090 OC Edition Gaming Graphics Card (PCIe 4.0, 24GB GDDR6X, HDMI 2.1a, DisplayPort 1.4a), 3 Year Warranty

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#3 Pick

ASUS TUF Gaming NVIDIA GeForce RTX 4080 Super OC Edition Gaming Graphics Card (PCIe 4.0, 16GB GDDR6X, HDMI 2.1a, DisplayPort 1.4a), 3 Year Warranty

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#4 Pick

ASUS TUF Gaming NVIDIA GeForce RTX 4080 Super OC Edition Gaming Graphics Card (PCIe 4.0, 16GB GDDR6X, HDMI 2.1a, DisplayPort 1.4a) (Renewed)

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Specifications Compared

The RTX 4090 has 60% more CUDA cores, 50% more memory and about 37% more bandwidth. It does not scale linearly with those numbers in games, because at lower resolutions the CPU and other parts of the pipeline become the limit, but at 4K the extra hardware shows.

4K Performance: Where the RTX 4090 Earns Its Price

Reviews agree on a clear 4K lead for the RTX 4090, with the exact size depending on the game suite. KitGuru measured the RTX 4080 Super about 24% slower than the RTX 4090 at 4K, which means the 4090 is roughly 32% faster. The PC Enthusiast’s review roundup reported a similar 31% advantage. TechPowerUp’s launch data showed the RTX 4090 around 25% faster than the original RTX 4080, and their RTX 4080 Super testing found the Super only about 1.5% faster than the non-Super, putting TechPowerUp’s implied gap in the low-to-mid 20s. Taken together, a 25% to 33% lead at 4K is a fair summary.

In practical terms, a game that averages around 75 fps at 4K high on an RTX 4080 Super would typically run somewhere around 93 to 100 fps on an RTX 4090. These are approximate; results vary with game, settings, CPU and patch.

1440p

At 1440p the gap shrinks considerably, to around 15% in published comparisons, and less in CPU-limited titles. Both cards deliver very high frame rates at this resolution, so the 4090’s extra cost buys relatively little for 1440p players unless they target the highest refresh rates with the fastest CPUs.

Ray tracing and path tracing

Ray tracing tends to widen the gap. KitGuru measured the RTX 4080 Super about 28% slower than the RTX 4090 in ray-traced tests at 4K. In path-traced games, the 4090’s extra RT cores and memory make the difference between a borderline and a smoother experience with DLSS.

Shared Features, Different Headroom

Both cards have the identical Ada Lovelace feature set:

• DLSS super resolution, including the DLSS 4 transformer model
• DLSS 3 frame generation
• Nvidia Reflex
• Dual AV1 encoders for streaming and video work

Multi Frame Generation is exclusive to RTX 50 cards, so neither card gets it. Because frame generation works best with a high base frame rate, the RTX 4090’s extra performance makes its frame-generated output feel more responsive in the most demanding titles.

Is 16 GB Enough, or Do You Need 24 GB?

For gaming in 2026, 16 GB on the RTX 4080 Super is enough for 4K in nearly all titles, including many with ray tracing and frame generation. A small number of games with maximum texture packs, path tracing and frame generation at 4K can approach 16 GB. A rough guide:

• 1440p ultra with ray tracing: around 10 to 14 GB
• 4K ultra with ray tracing: around 12 to 16 GB
• 4K path tracing with frame generation and high-resolution textures: can exceed 16 GB in some titles

The 24 GB on the RTX 4090 matters most outside gaming: running larger local AI models, 3D rendering with big scenes, and high-resolution video editing. For buyers who do these tasks, the 4090’s memory alone can justify its cost.

Power, Connector and Case Requirements

Using the sizing rule of GPU power plus CPU power plus about 150 W of headroom, with a high-end 150 W CPU typical of builds at this tier:

Both cards use the 16-pin 12VHPWR/12V-2×6 connector. The RTX 4090 drew attention for melted connectors early in its life, generally attributed to plugs that were not fully seated or were bent sharply close to the socket. To minimize risk, use a native 16-pin cable from an ATX 3.x PSU where possible, push the plug fully home, and leave room for a gentle cable bend.

Both are large three-slot cards: the RTX 4090 reference length is 304 mm and the RTX 4080 Super is listed at 310 mm, and many partner models exceed 330 mm and are thicker than three slots. A full mid-tower or larger with good airflow is the practical requirement. Heavy cards also benefit from a support bracket to prevent PCIe slot sag.

Value Math

Setting the RTX 4080 Super at 100 performance points and the RTX 4090 at about 128 at 4K:

• RTX 4080 Super: $999 / 100 = about $9.99 per point
• RTX 4090: $1,599 / 128 = about $12.49 per point

At launch prices, the RTX 4080 Super delivered about 25% more performance per dollar. Both are now previous-generation cards and largely found on the used market, where the gap is often wider: used RTX 4090 prices have stayed high, often somewhere around $1,500 to $2,000, while a used RTX 4080 Super is usually around $800 to $1,000, depending on condition and region. Inspect the 16-pin connector for discoloration on any used card.

Current-generation alternatives change the picture too. The RTX 5080 is generally reviewed as slightly faster than the RTX 4080 Super but below the RTX 4090, with 16 GB and Multi Frame Generation. The RTX 5090 is the only current card clearly above the RTX 4090.

Which One Should You Buy?

For pure gaming, the RTX 4080 Super is the more sensible purchase for most buyers. The RTX 4090 is worth it for those who need the highest 4K performance or the extra memory for professional and AI work.

Frequently Asked Questions

How much faster is the RTX 4090 than the RTX 4080 Super?

At 4K, published reviews put the RTX 4090 roughly 25% to 33% ahead, with larger gaps in ray-traced games. At 1440p the lead shrinks to around 15%. At 1080p both cards are often limited by the CPU.

Is the RTX 4080 Super an upgrade from the RTX 4090?

No. Despite its later release date, the RTX 4080 Super is a slower card with less memory. It was introduced as a cheaper option within the same generation. An RTX 4090 owner would only consider an RTX 5090 as a real upgrade.

What power supply does the RTX 4090 need?

Nvidia’s guidance and common practice point to an 850 W or larger quality unit, with 1000 W sensible alongside a high-end CPU. An ATX 3.x PSU with a native 16-pin cable is the cleanest setup. Make sure the connector is fully seated.

Is 16 GB on the RTX 4080 Super enough for 4K?

For nearly all current games, yes. A few titles with path tracing, frame generation and maximum texture packs at 4K can approach or exceed 16 GB. Gamers who play those specific games at maximum settings, or who use large AI models, benefit from the RTX 4090’s 24 GB.

Should I buy an RTX 4080 Super or an RTX 5080?

The RTX 5080 is generally reviewed as slightly faster, with Multi Frame Generation and the same 16 GB of memory. At similar prices, the RTX 5080 is the more future-proof option. A discounted or used RTX 4080 Super can still be the better value when the price difference is significant.