AMD Aldebaran Rumored To Be Arcturus’s Successor, Could Be Featured on Instinct MI200 GPU Accelerator

It looks like AMD is accelerating the production of its next-generation Instinct accelerator, the MI200, which is expected to feature an MCM GPU design. According to the latest information dump, not only is the codename for the GPU unveiled but also a range of new specifications.

AMD Instinct MI200 Accelerator Rumored To Be Codenamed Aldebaran, Will Succeed Arcturus With MCM GPU Design & HBM2E Memory

The AMD Instinct family, starting in 2020, is all CDNA architecture-based. The first generation CDNA flagship, the Instinct MI100, was internally codenamed Arcturus. It was a follow-up to Vega and the GPUs are named after giant stars. The successor to the Instinct MI100, the MI200, is also seemingly going to be named after a huge star and this time, it is expected to be known as Aldebaran.

In the latest Linux patch support (via Phoronix), the AMD Instinct MI200 could be known as Aldebaran which is a giant star located within the constellation of Taurus and has a solar radius of 44.13 or 75% more than Arcturus. The naming convention seems to suggest that Aldebaran will be twice as powerful as Arcturus since the numbers in the MI accelerator's naming convention represent the theoretical Flops performance. This is just speculation at this point but given that the accelerator is expected to feature an MCM GPU design, it might be real.

The patches also reveal that the AMD Instinct MI200 'Aldebaran' GPU will feature HBM2E memory support. The brand new memory standard was first used by NVIDIA's Ampere GA100 GPUs & will offer a nice boost over the standard HBM2 configuration used on the Arcturus-based MI100 GPU accelerator. HBM2E allows up to 16 GB memory capacity per stack so we can expect up to 64 GB HBM2E memory at blisteringly fast speeds for Aldebaran.

Other features listed include SDMA (System Direct Memory Access) support which will allow data transfers over PCIe and XGMI/Infinity Cache subsystems. It looks like AMD will incorporate its new Infinity Cache design on upcoming Instinct accelerators too so we are looking for a very advanced version of the Vega GPU.

ARCTURUS

ALDEBARAN

.asic_family = CHIP_ARCTURUS, .asic_name = “arcturus”, .max_pasid_bits = 16, .max_no_of_hqd = 24, .doorbell_size = 8, .ih_ring_entry_size = 8 * sizeof(uint32_t), .event_interrupt_class = &event_interrupt_class_v9, .num_of_watch_points = 4, .mqd_size_aligned = MQD_SIZE_ALIGNED, .supports_cwsr = true, .needs_iommu_device = false, .needs_pci_atomics = false, .num_sdma_engines = 2, .num_xgmi_sdma_engines = 6, .num_sdma_queues_per_engine = 8,

.asic_family = CHIP_ALDEBARAN, .asic_name = “aldebaran”, .max_pasid_bits = 16, .max_no_of_hqd = 24, .doorbell_size = 8, .ih_ring_entry_size = 8 * sizeof(uint32_t), .event_interrupt_class = &event_interrupt_class_v9, .num_of_watch_points = 4, .mqd_size_aligned = MQD_SIZE_ALIGNED, .supports_cwsr = true, .needs_iommu_device = false, .needs_pci_atomics = false, .num_sdma_engines = 2, .num_xgmi_sdma_engines = 3, .num_sdma_queues_per_engine = 8,

There's also a hint at the MCM GPU design again for the AMD Instinct MI200 'Aldebaran GPU'. The patch states a new mode known as Performance Determinism in which the PMFW will maintain sustained performance level and can be enabled on a per-die basis. This would allow each GPU die to run this feature but a max graphics frequency needs to be specified so they don't exceed the power caps.

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Do note that AMD's CDNA 2 GPU will be fabricated on a brand new process node & are confirmed to feature a 3rd Generation AMD Infinity architecture that extends to Exascale by allowing up to 8-Way coherent GPU connectivity.

AMD Radeon Instinct Accelerators 2020

Accelerator Name	AMD Radeon Instinct MI6	AMD Radeon Instinct MI8	AMD Radeon Instinct MI25	AMD Radeon Instinct MI50	AMD Radeon Instinct MI60	AMD Instinct MI100	AMD Instinct MI100
GPU Architecture	Polaris 10	Fiji XT	Vega 10	Vega 20	Vega 20	Arcturus	TBA
GPU Process Node	14nm FinFET	28nm	14nm FinFET	7nm FinFET	7nm FinFET	7nm FinFET	Advanced Process Node
GPU Cores	2304	4096	4096	3840	4096	7680	7680 x 2 (MCM) ?
GPU Clock Speed	1237 MHz	1000 MHz	1500 MHz	1725 MHz	1800 MHz	~1500 MHz	TBA
FP16 Compute	5.7 TFLOPs	8.2 TFLOPs	24.6 TFLOPs	26.5 TFLOPs	29.5 TFLOPs	185 TFLOPs	TBA
FP32 Compute	5.7 TFLOPs	8.2 TFLOPs	12.3 TFLOPs	13.3 TFLOPs	14.7 TFLOPs	23.1 TFLOPs	TBA
FP64 Compute	384 GFLOPs	512 GFLOPs	768 GFLOPs	6.6 TFLOPs	7.4 TFLOPs	11.5 TFLOPs	TBA
VRAM	16 GB GDDR5	4 GB HBM1	16 GB HBM2	16 GB HBM2	32 GB HBM2	32 GB HBM2	TBA
Memory Clock	1750 MHz	500 MHz	945 MHz	1000 MHz	1000 MHz	1200 MHz	TBA
Memory Bus	256-bit bus	4096-bit bus	2048-bit bus	4096-bit bus	4096-bit bus	4096-bit bus	TBA
Memory Bandwidth	224 GB/s	512 GB/s	484 GB/s	1 TB/s	1 TB/s	1.23 TB/s	TBA
Form Factor	Single Slot, Full Length	Dual Slot, Half Length	Dual Slot, Full Length	Dual Slot, Full Length	Dual Slot, Full Length	Dual Slot, Full Length	OAM
Cooling	Passive Cooling	Passive Cooling	Passive Cooling	Passive Cooling	Passive Cooling	Passive Cooling	Passive Cooling
TDP	150W	175W	300W	300W	300W	300W	TBA

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via AMD Aldebaran Rumored To Be Arcturus’s Successor, Could Be Featured on Instinct MI200 GPU Accelerator
by Hassan Mujtaba