AMD Radeon Instinct MI100 With Arcturus GPU Spotted – 32 GB HBM2 Memory, 200W TDP In Early Prototype

AMD's upcoming Radeon Instinct MI100 HPC accelerator which would feature the Arcturus GPU has been spotted by Komachi. The existence of the AMD Arcturus GPU was confirmed all the way back in 2018 and two years later, we are finally starting to get details regarding the specifications for AMD's next HPC/AI accelerator.

AMD Arcturus GPU Powered Radeon Instinct MI100 HPC / AI Accelerator Features 32 GB HBM2, 200W TDP In Early Prototypes

The "Arcturus" codename comes from the red giant star which is the brightest in the constellation of Bootes and among the brightest stars that can be seen from space. Similar to Vega and Navi, both of which are also some of the brightest stars visible in the night sky, the naming scheme takes inspiration from the time since RTG was created and the founding father, Raja Koduri (ex AMD RTG President), put a lot of emphasis on bright stars when they first introduced Polaris.

Previously, we have seen support for Arcturus GPU added to HWiNFO, in particular, the XL variant. To our surprise, the new variant that has leaked out 'D34303' is also based on the XL die and would go on to power the Radeon Instinct MI100. The information for this part is based on a test board so it is likely that final specifications would not be the same but here are the key points:

• Based on Arcturus XL GPU
• Test Board has a TDP of 200W
• Up To 32 GB HBM2 Memory
• HBM2 Memory Clocks Reported Between 1000-1200 MHz

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AMD MI100 HBM2 D34303 A1 XL 200W 32GB 1000M.

— 比屋定さんの戯れ言@Komachi (@KOMACHI_ENSAKA) February 7, 2020

The Radeon Instinct MI100 test board has a TDP of 200W and is based on the XL variant of AMD's Arcturus GPU. The card also features 32 GB of HBM2 memory with pin speeds of 1.0 - 1.2 GHz. The MI60 in comparison has 64 CUs with a TDP of 300W while clock speeds are reported at 1200 MHz (Base Clock) while the memory operates at 1.0 GHz along with a 4096-bit bus interface, pumping out 1 TB/s bandwidth. There's a big chance that the final design of the Arcturus GPU could be featuring Samsung's latest HBM2E 'Flashbolt' memory which offers 3.2 Gbps speeds for up to 1.5 Tb/s of bandwidth.

AMD Radeon Instinct Accelerators 2020

Accelerator Name	AMD Instinct MI300	AMD Instinct MI250X	AMD Instinct MI250	AMD Instinct MI210	AMD Instinct MI100	AMD Radeon Instinct MI60	AMD Radeon Instinct MI50	AMD Radeon Instinct MI25	AMD Radeon Instinct MI8	AMD Radeon Instinct MI6
CPU Architecture	Zen 4 (Exascale APU)	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
GPU Architecture	TBA (CDNA 3)	Aldebaran (CDNA 2)	Aldebaran (CDNA 2)	Aldebaran (CDNA 2)	Arcturus (CDNA 1)	Vega 20	Vega 20	Vega 10	Fiji XT	Polaris 10
GPU Process Node	5nm+6nm	6nm	6nm	6nm	7nm FinFET	7nm FinFET	7nm FinFET	14nm FinFET	28nm	14nm FinFET
GPU Chiplets	4 (MCM / 3D Stacked) 1 (Per Die)	2 (MCM) 1 (Per Die)	2 (MCM) 1 (Per Die)	2 (MCM) 1 (Per Die)	1 (Monolithic)	1 (Monolithic)	1 (Monolithic)	1 (Monolithic)	1 (Monolithic)	1 (Monolithic)
GPU Cores	28,160?	14,080	13,312	6656	7680	4096	3840	4096	4096	2304
GPU Clock Speed	TBA	1700 MHz	1700 MHz	1700 MHz	1500 MHz	1800 MHz	1725 MHz	1500 MHz	1000 MHz	1237 MHz
FP16 Compute	TBA	383 TOPs	362 TOPs	181 TOPs	185 TFLOPs	29.5 TFLOPs	26.5 TFLOPs	24.6 TFLOPs	8.2 TFLOPs	5.7 TFLOPs
FP32 Compute	TBA	95.7 TFLOPs	90.5 TFLOPs	45.3 TFLOPs	23.1 TFLOPs	14.7 TFLOPs	13.3 TFLOPs	12.3 TFLOPs	8.2 TFLOPs	5.7 TFLOPs
FP64 Compute	TBA	47.9 TFLOPs	45.3 TFLOPs	22.6 TFLOPs	11.5 TFLOPs	7.4 TFLOPs	6.6 TFLOPs	768 GFLOPs	512 GFLOPs	384 GFLOPs
VRAM	192 GB HBM3?	128 GB HBM2e	128 GB HBM2e	64 GB HBM2e	32 GB HBM2	32 GB HBM2	16 GB HBM2	16 GB HBM2	4 GB HBM1	16 GB GDDR5
Memory Clock	TBA	3.2 Gbps	3.2 Gbps	3.2 Gbps	1200 MHz	1000 MHz	1000 MHz	945 MHz	500 MHz	1750 MHz
Memory Bus	8192-bit	8192-bit	8192-bit	4096-bit	4096-bit bus	4096-bit bus	4096-bit bus	2048-bit bus	4096-bit bus	256-bit bus
Memory Bandwidth	TBA	3.2 TB/s	3.2 TB/s	1.6 TB/s	1.23 TB/s	1 TB/s	1 TB/s	484 GB/s	512 GB/s	224 GB/s
Form Factor	OAM	OAM	OAM	Dual Slot Card	Dual Slot, Full Length	Dual Slot, Full Length	Dual Slot, Full Length	Dual Slot, Full Length	Dual Slot, Half Length	Single Slot, Full Length
Cooling	Passive Cooling	Passive Cooling	Passive Cooling	Passive Cooling	Passive Cooling	Passive Cooling	Passive Cooling	Passive Cooling	Passive Cooling	Passive Cooling
TDP	~600W	560W	500W	300W	300W	300W	300W	300W	175W	150W

It is also mentioned that the Arcturus XL GPU could be a single huge monolithic die and not a chiplet based design like AMD's Zen 2 based Ryzen CPU lineup. The naming of the Radeon Instinct MI100 itself gives us a hint of its absolute performance metrics which would be around 100 TFLOPs of INT8. That's a 66% increase in INT8 (AI/DNN) compute horsepower. Similarly, the FP16 compute would be rated at around 50 TFLOPs, 25 TFLOPs of FP32 and 12.5 TFLOPs of FP64. The extra GPU horsepower could be coming through either an updated graphics architecture, much higher clocks or higher CUs, which is the best assumption.

We have only seen little details which are also speculation at best such as the GPU cache info that is part of the Virtual CRAT (vCrat) size. The GPU cache correlates with the CU count. In the case of AMD Arcturus GPU, the cache size has been increased and so have the CU count from 64 to 128. That is twice as many CUs as Vega 10 which would give us 8192 stream processors if AMD is using 64 stream processors per CU like their current and modern-day GPU designs.

While Arcturus is a Vega derivative, it's also a custom design solely for the HPC segment. This way, AMD can focus on parallel developments for the gaming/consumer segment and the HPC market which consists of AI/DNN and datacenter customers.

Just a few days ago, some interesting speculation based on the new configuration for the Big Red 200 supercomputer was posted by Dylan522p who suggests that NVIDIA's next-generation Ampere GPU based HPC parts could potentially feature up to 18 TFLOPs of FP64 compute. That would almost be a 50% lead over the Instinct MI100, but AMD has proved that they can offer more FLOPs at a competitive price so maybe that is where Arcturus would be targetting. There's no word on when Arcturus would land, but AMD has hinted at an Instinct product later this year.