Graphics cards/Comparison
13 specifications
NVIDIA GeForce RTX 4080 SUPER vs AMD Radeon RX 7900 XT
On paper, the AMD Radeon RX 7900 XT carries more memory (20 GB against 16 GB), and the AMD Radeon RX 7900 XT has a wider memory bus. Shading-unit counts are not directly comparable across different architectures, so read that row as context rather than a verdict. Specifications describe what each card is designed to do; how much of that either one holds under continuous load is a separate question.
NVIDIA GeForce RTX 4080 SUPER
NVIDIA · GeForce RTX 40 · Desktop
AMD Radeon RX 7900 XT
AMD · Radeon RX 7000 · Desktop
Compute
Memory
Power and platform
A check marks the higher figure only on rows where higher is unambiguously better. Rows without one are not ties; they are specifications where “better” has no meaning.
Reading the table
What the difference means.
2 years apart
The RTX 4080 SUPER (Ada Lovelace, 2024) is 2 years newer than the RX 7900 XT (RDNA 3, 2022). A newer architecture brings more than speed: newer video encoders and decoders, newer upscaling and frame generation, and a longer run of driver updates ahead of it.
Video memory
The RX 7900 XT has 20 GB of video memory against 16 GB. Memory does not make a card faster until it runs out, and then the drop is sharp: textures spill into system memory and frame times stutter. High resolutions, high texture settings, heavy mods and running AI models locally are what fill it.
Memory bus
The RX 7900 XT moves data over a 320-bit bus of GDDR6; the RTX 4080 SUPER uses 256-bit GDDR6X. The bus width and the memory type together set how fast the chip can reach its own memory, which shows at high resolutions where every frame moves more data. A narrow bus with fast memory can match a wide one with slow memory, so neither figure settles it alone.
Board power
The RTX 4080 SUPER draws up to 320 W against 300 W. That is heat the case has to exhaust and current the power supply has to deliver: allow a supply of about 750 W for the RTX 4080 SUPER with a typical processor, and check the card's power connectors against the supply's. A card that cannot shed its heat does not fail. It lowers its clocks after a few minutes, which is the frame rate that falls the longer you play.
Which to pick, on paper
- High resolutions, heavy textures, local AI
- RX 7900 XT
- 20 GB against 16 GB. Memory is the wall these workloads hit first.
- A small case or a modest power supply
- RX 7900 XT
- 300 W against 320 W: less heat, fewer power connectors, quieter fans.
What no table says
How much of its speed a graphics card keeps after the first minute depends on the cooling and the power limit of the machine it is in. If you own one of these, measure it: the test is free and runs in this browser.
Questions
- Is the RTX 4080 SUPER better than the RX 7900 XT?
- By need, on the specifications: high resolutions, heavy textures, local ai: the RX 7900 XT; a small case or a modest power supply: the RX 7900 XT. They are different designs, so the raw counts cannot rank them. Frame rates depend on the game and its settings, and how much speed either card keeps after ten minutes depends on its cooling, which is what a sustained test measures.
- Is 16 GB of video memory enough?
- For 1080p at sensible settings, yes in most games. At 1440p and above, with high texture settings, or for running AI models, 20 GB gives real headroom. When memory runs out the symptom is stutter, not a lower average.
- What power supply does the RTX 4080 SUPER need?
- Allow about 750 W with a typical processor, and make sure the supply has the power connectors the card uses. The RX 7900 XT at 300 W is easier on both.
More comparisons
- NVIDIA GeForce RTX 4080 SUPER vs NVIDIA GeForce RTX 4080
- NVIDIA GeForce RTX 4080 SUPER vs NVIDIA GeForce RTX 5080
- NVIDIA GeForce RTX 4080 SUPER vs NVIDIA GeForce RTX 5070 Ti
- NVIDIA GeForce RTX 4080 SUPER vs NVIDIA GeForce RTX 4070 Ti SUPER
- NVIDIA GeForce RTX 4080 SUPER vs AMD Radeon RX 9070 XT
- AMD Radeon RX 7900 XT vs NVIDIA GeForce RTX 4070 Ti SUPER
- AMD Radeon RX 7900 XT vs NVIDIA GeForce RTX 5070 Ti
- AMD Radeon RX 7900 XT vs NVIDIA GeForce RTX 4080
- AMD Radeon RX 7900 XT vs AMD Radeon RX 9070 XT
- AMD Radeon RX 7900 XT vs NVIDIA GeForce RTX 5060 Ti 16GB
Every figure on this table is a design target. None of it is a measurement.
Nothing above describes how a graphics card behaves twenty minutes into a sustained workload, which is where two chips with nearly identical specifications routinely diverge. A boost clock is a ceiling the vendor permits, not a rate the chip sustains, and whether it holds depends on the cooling, the case, the power profile and the room. None of those appear on a specification sheet.
We deliberately do not reduce these figures to a single score. A composite invented from specifications would look authoritative and measure nothing, and choosing the weights would be choosing the winner.