Nvidia has finally revealed how many of those mysterious RT Cores (Ray Tracing) its upcoming GeForce RTX 20 Series GPUs have.
The GTX 20 Series marks a major departure for Nvidia, arriving with no fewer than three distinct types of core.
First of all, we’ve got the standard CUDA Cores. These have been found on pretty every Nvidia GPU for the past decade and form the bulk of the processing power. A GeForce RTX 2080 Ti has 4352 CUDA Cores in its GPU.
In addition to this, each RTX GPU will also have Tensor Cores and RT Cores. Tensor Cores will handle AI computations and deep learning. The RTX 2080 Ti has 544 Tensor Cores. On top of this it also 68 RT Cores which are dedicated to accelerated ray-traced processing.
So the general breakdown of a Turing GPU works like this. Each Turing TU102 GPU has six GPCs (Graphics Processing Cluster). Each GPC has 12 SMs. Within each SM there are 64 CUDA Cores, 8 Tensor Cores and a single RT Core.
Extrapolating this data we can piece together the GeForce RTX 2080 Ti has 68 RT Cores, the GeForce RTX 2080 has 46 RT Cores, and the GeForce RTX 2070 has 36 RT Cores. This pretty much checks out with what Nvidia has told us in terms of performance. The RTX 2080 Ti leads the pack with 10 Gigarays/s, the 2080 can calculate 8 Gigarays/s, while the RTX 2070 sits at the bottom with 6 Gigarays/s.
|Graphics Card||Ray Tracing Performance||RT Core Count|
|GeForce RTX 2080 Ti||10 Giga Rays/s||68|
|GeForce RTX 2080||8 Giga Rays/s||46|
|GeForce RTX 2070||6 Giga Rays/s||36|
From the sound of things, these additional Tensor and RT Cores are contributing to the goliath size of the GPUs onboard the GTX 20 Series chips. The GeForce RTX 2080 Ti, for example, is an absolute goliath with a 754 mm² GPU die. If we compare this to the previous generation, the GeForce GTX 1080 Ti is comparatively tiny at 471 mm² die size, making the RTX 2080 Ti GPU roughly 60% larger. This goes some way to explaining the eye-watering jump in price from Pascal to Turing, but gamers are going to expect at least a similar leap in performance.
The GeForce RTX 20 Series is out from September 20th and pre-orders are live now.