AMD Launches RDNA Macro Architecture: PCIe 4.0, 1.25x IPC And 1.5x Performance Per Watt Upgrade Over GCN
As I have been exclusively telling you for over a year, NAVI will be the first non-GCN architecture and AMD has just officially confirmed that fact. RDNA will be succeeding GCN and will be debuting with the Navi micro architecture. It overcomes many of GCN's limitations and features significantly upgraded architectural features.
AMD RDNA architecture features 1.25x times the IPC and 1.5x times the performance per watt
The AMD RDNA architecture will feature 1.25x times the IPC and 1.5 times the performance per watt. Most interestingly however, it features a completely new compute unit design. This means my exclusives on Navi may need a revision - since all of them were based on the CUs having the same CU-to-SP count ratio as GCN. The new compute design features improved efficiency as well as a new multi-level cache hierarchy. This results in reduced latency, higher bandwidth availability ( on a per-core basis) and lower power consumption.
The RDNA macro-architecture also features streamlined graphics pipeline which features "high clock speed". This might hint to the fact that the company is going to be chasing after high clock speeds seen in its competitors product which can clock up to 1900 MHz (in comparison, AMD GPUs usually stick around 1500 MHz). If this is true then we should be seeing some pretty big performance gains.
The all-new RDNA macro architecture is expected to stick around for a while. To those who are wondering, the Next-Gen architecture on AMD's roadmap will be a micro-architecture under RDNA and the Next-Gen is just a place holder. Navi architecture is the true successor that we have been waiting for a very long time. It also overcomes one of the biggest limitations fo GCN architecture, and the real reason AMD was pushing for this: the 4096 SP limit that was holding back Radeon Graphics.
Finally, here is the kicker, RDNA fully supports PCIe 4.0 which means NAVI GPU is slated to be the first PCIe 4.0 gaming GPU in the world. This is great news because it means the company is looking to future proof its lineup for the get go - something its known for and has a considerable amount of goodwill for. All in all, not much other information was revealed about the architecture and we can't wait to hear more details at E3. Exciting stuff is coming.