HX sizes series

Article
2025-05-22

HX-series VMs are optimized for workloads that require significant memory capacity with twice the memory capacity as HBv4. For example, workloads such as silicon design can use HX-series VMs to enable EDA customers targeting the most advanced manufacturing processes to run their most memory-intensive workloads.

HX 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. HX-series VMs also provide 1408 GB of RAM, 2.3 GB L3 cache. The 2.3 GB L3 cache per VM can deliver up to 5.7 TB/s of bandwidth to amplify up to 780 GB/s of bandwidth from DRAM, for a blended average of 1.2 TB/s of effective memory bandwidth across a broad range of customer workloads. The VMs also provide up to 12 GB/s (reads) and 7 GB/s (writes) of block device SSD performance.

All HX-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	1408 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

Feature support

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

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_HX176rs	176	1408	2304	780	2.4	3.7	3.7
Standard_HX176-144rs	144	1408	2304	780	2.4	3.7	3.7
Standard_HX176-96rs	96	1408	2304	780	2.4	3.7	3.7
Standard_HX176-48rs	48	1408	2304	780	2.4	3.7	3.7
Standard_HX176-24rs	24	1408	2304	780	2.4	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_HX176rs	1	480	2	1800
Standard_HX176-144rs	1	480	2	1800
Standard_HX176-96rs	1	480	2	1800
Standard_HX176-48rs	1	480	2	1800
Standard_HX176-24rs	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_HX176rs	32
Standard_HX176-144rs	32
Standard_HX176-96rs	32
Standard_HX176-48rs	32
Standard_HX176-24rs	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_HX176rs	8	80000
Standard_HX176-144rs	8	80000
Standard_HX176-96rs	8	80000
Standard_HX176-48rs	8	80000
Standard_HX176-24rs	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_HX176rs	1	400
Standard_HX176-144rs	1	400
Standard_HX176-96rs	1	400
Standard_HX176-48rs	1	400
Standard_HX176-24rs	1	400

Backend Networking resources

Set up Infiniband on HPC VMs

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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HX sizes series

Host specifications

Feature support

Sizes in series

VM Basics resources

Other size information

Next steps

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