Memory Addressing Limits for ESXi 5.1.x, 5.5.x 6.x and 7.0
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Memory Addressing Limits for ESXi 5.1.x, 5.5.x 6.x and 7.0

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Article ID: 320256

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Updated On: 01-30-2025

Products

VMware vSphere ESXi

Issue/Introduction

This article provides information about Memory Addressing Limits for ESXi 5.1.x, ESXi 5.5.x, 6.x and 7.0.


Environment

VMware vSphere ESXi 5.1
VMware vSphere ESXi 5.5
VMware vSphere ESXi 6.0
VMware vSphere ESXi 6.7
VMware vSphere ESXi 7.0.0
VMware vSphere ESXi 6.5

Resolution

The following table describes the Memory Addressing Limits for ESXi 5.1.x, ESXi 5.5.x, 6.x and 7.0:

 

 
 
Parameters
ESXi Release
5.1.x
5.5.x
6.0.x 6.5.x 6.7.x 7.0
Maximum Physical Address (MAXPA)
4 TiB
16 TiB
16 TiB 16 TiB 1024 TiB 1024 TiB
Maximum RAM Capacity (within MAXPA) [1]
2 TiB
4 TiB/6 TiB [2]
12 TiB 12 TiB 16 TiB 16 TiB
Maximum Physical Address for Non-Prefetchable PCI BAR [3]
4 GiB 
4 GiB 
4 GiB 4 GiB 4 GiB  4 GiB 
Maximum Physical Address for Prefetchable PCI BAR
MAXPA
MAXPA
MAXPA MAXPA None [4] None [4]


Note:

  1. RAM includes DRAM (Dynamic Random Access Memory) and PMem (Persistent Memory) on releases that support PMem.
  2. ESXi 5.5 Update 2 supports 6 TiB of RAM Capacity within MAXPA.
  3. For PCIe Endpoints directly under a PCI Host Bridge or a Subtractive-Decode PCI-PCI bridge, BARs up to the prefetchable limit are supported in ESXi 5.1 Update 2, ESXi 5.5.x, and later.
  4. Up to the physical addressing limit of the CPU.