Siemens SIMATIC HMI Series System Manual page 86

What's new in WinCC V7?
3.1 What's new in WinCC V7.4 SP1?
Operating systems
WinCC V7.4 SP1 runs on the following operating systems:
● WinCC client projects
– Windows 10 (Pro / Enterprise, 64-bit)
– Windows 8.1 (Pro / Enterprise, 32-bit)
– Windows 8.1 (Pro / Enterprise, 64-bit)
– Windows 7 SP1 (Ultimate / Professional / Enterprise, 32-bit)
– Windows 7 SP1 (Ultimate / Professional / Enterprise, 64-bit)
● For WinCC single-user projects and client projects
– Windows 10 (Pro / Enterprise, 64-bit)
– Windows 8.1 (Pro / Enterprise, 32-Bit)
– Windows 8.1 (Pro / Enterprise, 64-bit)
– Windows 7 SP1 (Ultimate / Professional / Enterprise, 32-bit)
– Windows 7 SP1 (Ultimate / Professional / Enterprise, 64-bit)
– Windows Server 2016 (Standard / Datacenter 64-bit)
– Windows Server 2012 R2 (Standard / Datacenter 64-bit)
– Windows Server 2008 R2 SP1 (Standard 64-bit)
● For WinCC Server
– Windows 10 (Pro / Enterprise, 64-bit)
– Windows 8.1 (Pro / Enterprise 64-bit)
– Windows 7 SP1 (Pro / Enterprise 64-bit)
– Windows Server 2016 (Standard / Datacenter 64-bit)
– Windows Server 2012 R2 (Standard / Datacenter 64-bit)
– Windows Server 2008 R2 SP1 (Standard 64-bit)
*) WinCC Server with up to three WinCC clients
Increased number of connections
Starting in WinCC V7.4 SP1, the following performance data applies:
● SIMATIC S7-1200: Up to 64 connections
● SIMATIC S7-1500: Up to 128 connections
The maximum possible number of connections is limited by the available system resources
and their performance data, particularly CPU, RAM, Ethernet connection.
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WinCC: General information and installation
System Manual, 02/2017, A5E40840020-AA