It's not entirely clear how AMD's Ray Accelerators stack up against Nvidia's RT cores. However, AMD still comes in at a lower power level than Nvidia's competing GPUs, which is a bit of a change of pace from previous generation architectures. This doesn't mean power requirements stayed the same - RX 6800 has a slightly higher TBP (Total Board Power) than the RX 5700 XT, and the 6800 XT and upcoming 6900 XT are back at 300W (like the Vega 64). The large cache also helps to reduce power consumption, which all ties into AMD's targeted 50 percent performance per Watt improvements. AMD says the effective bandwidth of the GDDR6 memory ends up being 119 percent higher than what the raw bandwidth would suggest. Thanks to the 128MB cache, the framebuffer mostly ends up being cached, which drastically cuts down memory access. It also ties into the Infinity Fabric, but fundamentally, it helps optimize memory access latency and improve the effective bandwidth. Besides a shared 1MB L1 cache for each cluster of 20 dual-CUs, there's a 4MB L2 cache and a whopping 128MB 元 cache that AMD calls the Infinity Cache. I saw the supposed leaks before the launch claiming 2.4GHz and 2.5GHz and thought, "There's no way." I was wrong.ĪMD's cache hierarchy is arguably one of the biggest changes.
AMD RADEON RX 6800 SOFTWARE
Playing around with overclocking a bit - and the software to do this is still missing, so we had to stick with AMD's built-in overclocking tools - we actually hit clocks of over 2.5GHz. That's where the greater than 2GHz clocks come from, but those aren't just fantasy numbers. But a lot of the underlying changes don't show up as an easily digestible number.įor example, AMD says it reworked much of the architecture to focus on a high speed design. There are other tweaks to the architecture, like support for 8K AV1 decode and 8K HEVC encode.
Support for ray tracing is probably the most visible new feature, but RDNA2 also supports Variable Rate Shading (VRS), mesh shaders, and everything else that's part of the DirectX 12 Ultimate spec.
Memory capacity has doubled, ROPs have doubled, TFLOPS has more than doubled, and the die size is also more than double.
AMD RADEON RX 6800 SERIES
Clock speeds are also higher, and - spoiler alert! - the 6800 series cards actually exceed the Game Clock and can even go past the Boost Clock in some cases.
AMD RADEON RX 6800 PLUS
AMD has just about doubled down on every important aspect of its architecture, plus adding in a huge amount of 元 cache and Ray Accelerators to handle ray tracing ray/triangle intersection calculations. When AMD fans started talking about "Big Navi" as far back as last year, this is pretty much what they hoped to see. With the arrival of Ryzen 5000, running AMD GPUs with AMD CPUs finally means no compromises. We've added more benchmarks on both Core i9-10900K and Ryzen 9 5900X. We've got our standard testbed using an 'ancient' Core i9-9900K CPU, but we wanted something a bit more for the fastest graphics cards on the planet. If you're just here for the benchmarks, skip down a few screens because, hell yeah, do we have some benchmarks. If you want to know more about the finer details of RDNA2, we'll cover that as well. Now, it's time to take all the theoretical aspects and lay some rubber on the track. We've previously discussed many aspects of today's launch, including details of the RDNA2 architecture, the GPU specifications, features, and more. How do AMD's latest GPUs stack up to the competition, and could this be AMD's GPU equivalent of the Ryzen debut of 2017? That's what we're here to find out.
AMD RADEON RX 6800 PC
AMD also finally joins the ray tracing fray, both with its PC desktop graphics cards and the next-gen PlayStation 5 and Xbox Series X consoles. Big Navi, aka Navi 21, aka RDNA2, has arrived, bringing some impressive performance gains.
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