HBv4 sizes series

HBv4-series VMs are optimized for many high-performance computing (HPC) workloads. These include:

Computational fluid dynamics
Finite element analysis
Frontend and backend Electronic Design Automation (EDA)
Rendering and graphics work
Molecular dynamics
Computational geoscience
Weather simulation
Financial risk analysis

HBv4 VMs feature up to 176 AMD EPYC™ 9V33X ("Genoa-X") CPU cores with AMD's 3D V-Cache, clock frequencies up to 3.7 GHz, and no simultaneous multithreading. HBv4-series VMs also provide 768 GB of RAM, 2304 MB L3 cache. Each VM has 2304 MB of L3 cache that delivers up to 5.7 TB/s of bandwidth. This boosts DRAM bandwidth of 780 GB/s, giving an average of 1.2 TB/s of effective memory speed for many workloads. The VMs also provide up to 12 GB/s (reads) and 7 GB/s (writes) of block device SSD performance.

All HBv4-series VMs feature 400 Gb/s NDR InfiniBand from NVIDIA Networking to enable supercomputer-scale MPI workloads. These VMs are connected in a non-blocking fat tree for optimized and consistent RDMA performance. NDR continues to support features like Adaptive Routing and the Dynamically Connected Transport (DCT). This newest generation of InfiniBand also brings greater support for offload of MPI collectives, optimized real-world latencies due to congestion control intelligence, and enhanced adaptive routing capabilities. These features enhance application performance, scalability, and consistency, and their usage is recommended.

Host specifications

Part	Quantity ^{Count Units}	Specs ^{SKU ID, Performance Units, etc.}
Processor	24 - 176 vCPUs	AMD EPYC 9V33X (Genoa-X) [x86-64]
L3 Cache	2304 MB
Memory	768 GB	780 GB/s
Local Storage	1 Temp Disk 2 NVMe Disks	480 GiB 1800 GiB
Remote Storage	32 Disks
Network	8 vNICs 1 InfiniBand NDR NIC	80 Gb/s 400 Gb/s
Accelerators	None

For features supported by this series, see the Feature support section.

Sizes in series

vCPUs (Qty.) and Memory for each size

Size Name	vCPUs (Qty.)	Memory (GB)	L3 Cache (MB)	Memory Bandwidth (GB/s)	Base CPU Frequency (GHz)	Single-core Frequency Peak (GHz)	All-core Frequency Peak (GHz)
Standard_HB176rs_v4	176	768	2304	780	2.55	3.7	3.7
Standard_HB176-144rs_v4	144	768	2304	780	2.55	3.7	3.7
Standard_HB176-96rs_v4	96	768	2304	780	2.55	3.7	3.7
Standard_HB176-48rs_v4	48	768	2304	780	2.55	3.7	3.7
Standard_HB176-24rs_v4	24	768	2304	780	2.55	3.7	3.7

VM Basics resources

Check vCPU quotas

Local (temp) storage info for each size

Size Name	Max Temp Storage Disks (Qty.)	Temp Disk Size (GiB)	Local Solid State Disks (Qty.)	Local Solid State Disk Size (GiB)
Standard_HB176rs_v4	1	480	2	1800
Standard_HB176-144rs_v4	1	480	2	1800
Standard_HB176-96rs_v4	1	480	2	1800
Standard_HB176-48rs_v4	1	480	2	1800
Standard_HB176-24rs_v4	1	480	2	1800

Storage resources

Table definitions

¹Temp disk speed often differs between RR (Random Read) and RW (Random Write) operations. RR operations are typically faster than RW operations. The RW speed is usually slower than the RR speed on series where only the RR speed value is listed.
Storage capacity is shown in units of GiB or 1024^3 bytes. When you compare disks measured in GB (1000^3 bytes) to disks measured in GiB (1024^3) remember that capacity numbers given in GiB may appear smaller. For example, 1023 GiB = 1098.4 GB.
Disk throughput is measured in input/output operations per second (IOPS) and MBps where MBps = 10^6 bytes/sec.
To learn how to get the best storage performance for your VMs, see Virtual machine and disk performance.

Remote (uncached) storage info for each size

Size Name	Max Remote Storage Disks (Qty.)
Standard_HB176rs_v4	32
Standard_HB176-144rs_v4	32
Standard_HB176-96rs_v4	32
Standard_HB176-48rs_v4	32
Standard_HB176-24rs_v4	32

Storage resources

Table definitions

¹Some sizes support bursting to temporarily increase disk performance. Burst speeds can be maintained for up to 30 minutes at a time.
Storage capacity is shown in units of GiB or 1024^3 bytes. When you compare disks measured in GB (1000^3 bytes) to disks measured in GiB (1024^3) remember that capacity numbers given in GiB may appear smaller. For example, 1023 GiB = 1098.4 GB.
Disk throughput is measured in input/output operations per second (IOPS) and MBps where MBps = 10^6 bytes/sec.
Data disks can operate in cached or uncached modes. For cached data disk operation, the host cache mode is set to ReadOnly or ReadWrite. For uncached data disk operation, the host cache mode is set to None.
To learn how to get the best storage performance for your VMs, see Virtual machine and disk performance.

Network interface info for each size

Size Name	Max NICs (Qty.)	Max Network Bandwidth (Mb/s)
Standard_HB176rs_v4	8	80000
Standard_HB176-144rs_v4	8	80000
Standard_HB176-96rs_v4	8	80000
Standard_HB176-48rs_v4	8	80000
Standard_HB176-24rs_v4	8	80000

Networking resources

Table definitions

Expected network bandwidth is the maximum aggregated bandwidth allocated per VM type across all NICs, for all destinations. For more information, see Virtual machine network bandwidth
Upper limits aren't guaranteed. Limits offer guidance for selecting the right VM type for the intended application. Actual network performance will depend on several factors including network congestion, application loads, and network settings. For information on optimizing network throughput, see Optimize network throughput for Azure virtual machines.
To achieve the expected network performance on Linux or Windows, you may need to select a specific version or optimize your VM. For more information, see Bandwidth/Throughput testing (NTTTCP).

Network interface info for each size

Size Name	Backend NICs (Qty.)	RDMA Performance (Gb/s)
Standard_HB176rs_v4	1	400
Standard_HB176-144rs_v4	1	400
Standard_HB176-96rs_v4	1	400
Standard_HB176-48rs_v4	1	400
Standard_HB176-24rs_v4	1	400

Backend Networking resources

Set up Infiniband on HPC VMs

Feature support

Feature name	Support status
Premium Storage	Supported
Premium Storage caching	Supported
Live Migration	Not Supported
Memory Preserving Updates	Not Supported
Generation 2 VMs	Supported
Generation 1 VMs	Not Supported
Accelerated Networking	Supported
Ephemeral OS Disk	Supported
Nested Virtualization	Not Supported
Backend Network	InfiniBand NDR

Other size information

List of all available sizes: Sizes

Pricing Calculator: Pricing Calculator

Information on Disk Types: Disk Types

Next steps

Take advantage of the latest performance and features available for your workloads by changing the size of a virtual machine.

Utilize Microsoft's in-house designed ARM processors with Azure Cobalt VMs.

Learn how to Monitor Azure virtual machines.

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Last updated on 2026-03-10

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HBv4 sizes series

Host specifications

Sizes in series

VM Basics resources

Feature support

Other size information

Next steps

Feedback

Additional resources