AMD Instinct MI300 to be first generation exascale APU with Zen4 CPU and CDNA3 GPU

Please note that this post is tagged as a rumor.

One of the Instinct MI300 products could be AMD’s first exascale APU

Earlier this month, we learned that Instinct MI300 product family from AMD will launch in many forms. This first CDNA3-based product would feature 3D stacking technology that allows AMD to provide various configurations to customers, including a combination of CPU and GPU dies.

In a newly leaked slide, allegedly from an AMD internal MI300 presentation, the company calls its new data-center processor as ‘first generation Instinct APU‘. This would actually be a confirmation of a very old rumor from 2019. Back then, a reliable hardware leaker “Komachi_Ensaka” discovered that upcoming AMD product would feature ‘a Big APU mode’, which was then expected for the MI200 series. An update to this rumor from September last year from ExecutableFix has revealed that this APU (now rumored to be MI300) would support a ‘SH5’ socket. We covered both rumors in this post.

A new slide from AdoredTV confirms that MI300 is also an APU. One of the configurations would indeed feature Zen4 CPU cores as well as CDNA3 GPU cores. This would also be an HBM-equipped device, meaning that all major components would be based on a single package, creating the world’s biggest x86 APU for data-centers.

AMD Instinct MI300, Source: AdoredTV

The picture above might actually be showing the MI300 for the first time. We can clearly see it has at least 6 HBM stacks, and it looks like a socketed product. However, it looks neither like MI200 GPU nor like EPYC processor. If we were to compare this blurry render to what was posted by Moore’s Law is Dead earlier this month, then one might assume that this APU could be just as big as the full CDNA3 GPU with 8 tiles (so the largest one).

AMD Instinct MI300, Source: Moore’s Law is Dead & AdoredTV

All that said, one probably shouldn’t use a single-set of specs for the MI300 series, The APU might simply be one of the few variants for now a growing family of CDNA3 products.

RUMORD AMD Instinct Accelerators Specifications
VideoCardz AMD Radeon Instinct MI60 AMD Instinct MI100 AMD Instinct MI250X AMD Instinct MI300 (flagship)
Architecture & Nodes 7nm GCN5 (GFX906) 7nm CDNA1 (GFX908) 6nm CDNA2 (GFX90A) 5nm CDNA3 (GFX940) +
6nm (base)
CPU Zen4 (APU Mode)
GPU Vega 20 Arcturus Aldebaran (MCM) ? (3D Die Stacking)
Base Chiplets 2
Compute Tiles 1 1 2 8
Compute Units 64 120 220 TBC
GPU Clock Speed 1800MHz ~1500MHz ~1700MHz TBC
FP16 Compute 29.5 TFLOPS 185 TFLOPS 383 TFLOPS TBC
FP32 Compute 14.7 TFLOPS 23.1 TFLOPS 47.9 TFLOPS TBC
FP64 Compute 7.4 TFLOPS 11.5 TFLOPS 47.9 TFLOPS TBC
VRAM 32 GB HBM2 32 GB HBM2 128 GB
8x HBM2e
8x HBM3 stack
Memory Clock 2.0 Gbps 2.4 Gbps 3.2 Gbps TBC
Memory Bus 4096-bit 4096-bit 8192-bit 8192-bit
Memory Bandwidth 1 TB/s 1.23 TB/s 3.2 TB/s TBC
Form Factor Dual Slot, Full Length Dual Slot, Full Length OAM OAM
TDP 300W 300W 560W 600W+

Source: AdoredTV

Leave a Reply