AMD’s Radeon RX Vega 64 may be significantly weaker than the GeForce GTX 1080 Ti on paper, but that hasn’t stopped it absolutely gazumping Nvidia’s flagship during Forza Motorsport 7 benchmarks. Some stellar work on optimisation within’s AMD’s latest 17.9.3 Crimson driver release has seen its RX Vega graphics cards race into the lead.

Typically, the Radeon RX Vega 64 trades blows with Nvidia’s GeForce GTX 1080, while the Radeon RX Vega 56 is knocking around at the level of a GeForce GTX 1070, give or take a few percentage points. Not so in Forza 7, where RX Vega’s mastery of DirectX 12 has turned the tables.

The results come by way of Computer Base, who’ve been busy testing Forza 7 on Ultra graphics settings with 8x MSAA. It’s a brutal test for any GPU and a decent indicator of long-term form.

At 1080p resolution, the Radeon RX Vega holds a 23% advantage over the GeForce GTX 1080 Ti, pulling in 136.9 fps vs 111.2 frames per second. Even the Radeon RX Vega 56 manages to eclipse the 1080 Ti, running at 122.7 fps.

Once we shift to 1440p resolution we begin to see the Vega 56 fall by the wayside, slipping below the GTX 1080 Ti yet still running faster than the GTX 1080 and GTX 1070. The Radeon RX Vega 64 remains dominant though, still running almost 12% faster than the GeForce GTX 1080 Ti.

The final test is 4K, and it’s here things begin to fall down to their natural order. The Radeon RX Vega 64 drops into second place behind the 1080 Ti, yet it’s still managing to run 11% faster than the GeForce GTX 1080. That’s some impressive optimisation of DX12 performance, no matter how you look at it. The Vega series is really punching above its weight in this particular series of benchmarks.

Taking a look at frame times as well, Computer Base finds out that the Radeon RX Vega 64 is also delivering a much smoother frame rate than its competitor. Nvidia’s GTX 1080 often has spikes, creating a choppier experience.

Where this leaves us, it’s difficult to say. The evidence right there is that AMD is achieving more, with less, suggesting a performance bottleneck is being imposed on the GTX 1080 Ti. Nvidia themselves have confirmed the results are correct so they’ll certainly be eyeing up what’s gone wrong here and (hopefully) implementing a driver update.