RX 6800 or Arc B580? Picking the Right GPU

If you can find a healthy used RX 6800 for close to Arc B580 money, it is the better gaming card. It is roughly 10-20% faster in rasterized games, has 16 GB of VRAM, and does not depend on Resizable BAR or a fast CPU the way Arc does. The Arc B580 is the better pick for a new build with a warranty, a 550 W power supply, or a focus on ray tracing and XeSS frame generation. It uses about 60 W less and is a current-generation card with years of driver development ahead.

A Used Former High-End Card vs a New Budget Card

AMD launched the RX 6800 in October 2020 at $579. It is a cut-down Navi 21 RDNA 2 chip with 3,840 stream processors, 16 GB of GDDR6, and a huge 128 MB Infinity Cache. Intel’s Arc B580 arrived in December 2024 at $249 on the Xe2 Battlemage architecture, with 12 GB of GDDR6 and an 18 MB L2 cache. In 2026 the RX 6800 is mostly found on the used market, while the B580 is one of the most popular new budget cards, and the two often cost about the same.

Spec Comparison

Gaming Performance

Rasterization

Most sources place the RX 6800 ahead. A large aggregate of game results puts it about 10% faster on average, and 3DMark Time Spy graphics scores show a similar 9% lead. One aggregate site reports a much larger lead, close to 37%, but it is an outlier. In major outlet reviews, the B580 usually lands around RTX 4060 Ti territory at 1440p, while the RX 6800 sits a tier above. A reasonable expectation is that the RX 6800 is roughly 10-20% faster in raster at 1440p, with a slightly smaller margin at 1080p, where CPU limits come into play.

At 1440p high settings, demanding current games typically run at around 55-85 fps on the B580 and around 65-100 fps on the RX 6800. Results vary with settings, CPU, and game patch.

Ray tracing

The order reverses here. RDNA 2 was AMD’s first ray-tracing architecture and is relatively weak at it. Intel’s Xe2 RT units are notably stronger for their class. With ray tracing enabled, the B580 typically closes the gap or pulls ahead of the RX 6800, especially in heavier RT titles. If you plan to use ray tracing regularly, the B580’s advantage there partly offsets the RX 6800’s raster lead.

Driver overhead and older CPUs

After launch, reviewers including Hardware Unboxed found that the B580 loses more performance than AMD or Nvidia cards when paired with older or budget CPUs, because of higher driver overhead. With a modern mid-range CPU this mostly disappears. With an older chip, the RX 6800’s lead can grow well beyond the averages above. Arc also needs Resizable BAR enabled. Without it, performance drops significantly.

Upscaling and Frame Generation

• Arc B580: XeSS 2, including XeSS super resolution running on XMX AI engines, XeSS frame generation, and Xe Low Latency in supported games. XeSS on Arc hardware generally looks noticeably better than FSR 3.1.
• RX 6800: FSR 3.1 upscaling, FSR 3 frame generation in supported games, and AMD Fluid Motion Frames, a driver-level frame generation for games without native support. AMD’s AI-based FSR 4 is officially limited to RX 9000 cards, so RDNA 2 owners should not plan around it.

The B580 has the better upscaler on paper and in image quality. The RX 6800 has broader driver-level frame generation and a longer history of game compatibility.

VRAM: 16 GB vs 12 GB

Both cards have more memory than the 8 GB cards they usually compete with, which is a big reason both are popular. The RX 6800’s 16 GB on a 256-bit bus gives a bit more headroom for 1440p ultra textures and future releases. Its 128 MB Infinity Cache also keeps performance steady at high resolutions. The B580’s 12 GB is enough for 1440p high textures in nearly every current game. In practice, 12 GB covers 1440p today, and 16 GB adds margin for the next few years and for mods.

Power, PSU, and Case Notes

The RX 6800 is rated at 250 W with two 8-pin connectors. The B580 is rated at 190 W with one 8-pin. PSU sizing using GPU TDP + CPU + about 150 W of headroom:

• Arc B580 + 105 W CPU: 190 + 105 + 150 = 445 W, so a quality 550 W unit.
• RX 6800 + 105 W CPU: 250 + 105 + 150 = 505 W, so a quality 600-650 W unit with two PCIe cables.

Lengths are similar: 267 mm for the RX 6800 reference card and 272 mm for the B580 per the listed figures. Both are two slots wide, though partner RX 6800 boards are often 2.5 slots or larger. The B580 uses a PCIe 4.0 x8 link, which loses a little performance on PCIe 3.0 boards. The RX 6800’s x16 link is not affected by this. The B580’s HDMI 2.1a and DisplayPort 2.1 outputs are newer than the RX 6800’s ports, which matters for high-refresh 4K monitors and TVs.

Used RX 6800 Checklist

Used RX 6800 cards usually sell for around $240-$320. Before buying:

• Run a stress test or demanding game and check hotspot temperatures. Dried thermal paste is common on cards from 2020-2021.
• Ask whether the card was used for mining, and inspect fans for wobble or noise.
• Assume no remaining warranty.

AMD still supports RDNA 2 with game-ready drivers, but it is an older generation, and newer features such as FSR 4 are aimed at current hardware.

Cost per Frame

At launch MSRPs ($579 vs $249), the RX 6800 cost about 2.3 times as much for roughly 10-20% more performance, so the B580 delivered about twice the performance per dollar. On the 2026 market the comparison is much closer. A used RX 6800 at around $280 against a B580 near $250 is about 12% more money for 10-20% more raster performance. That is roughly break-even to slightly better value for the AMD card, before counting the B580’s warranty and 60 W lower power draw.

Which to Buy

If your budget can stretch a little, the Radeon RX 9060 XT 16GB and RTX 5060 Ti 16GB offer current features with performance in this same range.

Frequently Asked Questions

Is the RX 6800 faster than the Arc B580?

Yes, in most rasterized games. Benchmark data generally puts it around 10-20% ahead at 1440p, with one aggregate source reporting a larger gap. The B580 performs better relative to the RX 6800 with ray tracing enabled.

Does the Arc B580 work well with older CPUs?

Not as well as AMD or Nvidia cards do. Reviewers found that Arc’s driver overhead reduces performance on older or budget CPUs, sometimes significantly. The card also requires Resizable BAR to be enabled for proper performance.

Is 12 GB of VRAM enough compared with 16 GB?

For 1440p gaming in 2026, 12 GB handles nearly all current games at high texture settings. The RX 6800’s 16 GB gives more margin for ultra textures, mods, and future releases. Both are comfortably ahead of 8 GB cards.

What PSU is needed for each card?

A quality 550 W power supply covers the Arc B580 with a typical CPU. The RX 6800 is better paired with a 600-650 W unit and needs two 8-pin PCIe connectors.

Can the RX 6800 use FSR 4?

AMD’s machine-learning-based FSR 4 is officially designed for RX 9000 series cards. The RX 6800 supports FSR 3.1 upscaling, FSR 3 frame generation, and AMD Fluid Motion Frames.