BVHs, used for geometrically complex objects, are costly elements in graphics workloads. The second new piece of hardware is the equally impressive-sounding Displaced Micro-Mesh Engine, which is designed to reduce the performance penalty associated with building and storing bounding volume hierarchies (BVH). Overall, Nvidia has reported a doubling of scene-traversal performance in applications with alpha-tested geometry using the Opacity Micromap Engine. In this example, the workload sent to the shaders is reduced by more than half, but naturally this would vary depending on the image in question.
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This work is handed off to the shader cores to run code and determine what happens with the rest of the image. On all of the brown and blue tiles, however, it’s a mixture, and this requires more calculations. The green tiles, meanwhile, are fully opaque, and the GPU knows that it needs to do processing related to lighting on these sections. White tiles in the map are marked as transparent, and no lighting effects need to be applied to those bits. With an Ampere RT core, the entire image would need to be processed to determine what happens with the Opacity Micromap Engine, this workload is reduced. The GPU needs to determine how a ray-traced ray of light affects the image. On both sides is placed an image of a leaf. Nvidia used the below diagram to illustrate how this works. Two new pieces of fixed-function hardware inside the Ada Lovelace RT cores work to accelerate ray-tracing performance and decrease the workload placed on other components, such as the CUDA cores.įirst is what Nvidia calls an Opacity Micromap Engine, which alpha-tests geometry. But the bulk of the processing resources exist inside of the SMs.Īrchitecturally speaking, the most significant improvements that Nvidia made to the Ada Lovelace architecture are in the RT cores. These include the ROPs, the L2 cache, the memory controllers, media encoders and decoders, and miscellaneous other components. Other important hardware resources exist on the GPU die outside of the SMs. For now, nothing else even comes close to it, so long as you are playing relatively modern games at 4K resolution. The card's $1,599 price may seem extreme, but so is this mega-card. The performance gains inherent in Lovelace are clear to see in Nvidia’s new GeForce RTX 4090 Founders Edition: They are enormous, and if this isn’t the company’s single greatest generational performance jump, it's close. But having now tested and reviewed our first new card based on the Ada Lovelace architecture, we can say it might well be true.
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So, when we hear Nvidia say something like “Ada (Lovelace) provides the largest generational performance upgrade in the history of Nvidia,” we sit up and pay attention.ĭetermining the absolute accuracy of that statement is tricky without carefully combing through old product offerings through the decades. Its first graphics accelerator wasn’t a major success, but that card was very much an outlier-far more often, its new graphics cards (Opens in a new window) offer big performance gains or push forward the industry as a whole. Nvidia has been a driving force in the PC graphics industry almost from the company’s founding.
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