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

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.