Preliminary xsx die_fact_finding
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The document discusses preliminary findings regarding the Xbox Series X (XSX) architecture based on information from AMD slides and cache sizes from RDNA1. It notes that in the RDNA1 (Navi10) architecture, two compute engines form a workgroup processor, and five workgroup processors form an asynchronous compute engine. It provides details on cache and memory sizes per workgroup processor and compute unit from AMD slides. It also notes similarities between the XSX and RDNA1 structures but that the number of compute units per group may be customized and references sources showing six compute units per group.
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Preliminary xsx die_fact_finding
- 1. Preliminary XSX fact finding (it is not about 100% correctness, it is about journey for connecting the dot), so dont use this as a fact!!! plus RDNA1 Slide and Cache data size by @blueisviolet
- 2. AMD Slide / Navi Fact In Navi, two Compute Engines form a Workgroup Processor, and five of those form an Asynchronous Compute Engine (ACE) important link RDNA1 (Navi10) https://www.amd.com/system/files/documents/rdna- whitepaper.pdf https://gpuopen.com/wp- content/uploads/2019/08/RDNA_Architecture_public.pdf https://gpuopen.com/rdna-shader-instruction-set-architecture- document-now-available/
- 3. AMD Slide / Navi Fact Some interesting of per SIMD32 block - VGPR (128KB) - SGPR (10KB) also hmmm so ALU provide: x32 ALU + DP unit x2 + Transcedental? unit x8 32KB I$ for 4 SPU ( 2 WGP) 16KB K$ (data cache) per 2 WGP
- 4. AMD Slide / Navi Fact In Navi, two Compute Engines (CU) form a Workgroup Processor, and five of those form an Asynchronous Compute Engine (ACE)
- 5. AMD Slide / Navi Fact 1 WGP (2CU)=2xL0(2 x 16KB) + I$ (32KB) + K$ (16KB)+VGPR(512KB)+SGPR(40KB)+128KB LDS 5 WGP (1 Shader Array) (1 ACE) = connect to 128KB L1, 1 CU = 256KB VGPR + 20KB SGPR
- 6. So Why ? Seems the E F G has similar structure
- 7. Zoomed, in normal CU, the 4 5 6 7 usually different it is like 10 Group, instead 4 like Navi, it is 6, what we know it seems per WGP can be customized, also remember X1 Hotchip on higher level diagram they showed as per 6 CU
- 8. Another thing is from Github, it is said 3 GDS and 6 LDS per group. Also provided X1 Hotchip slide (per 6)