The table below lists the tested and theoretical maximums (limits) for services offered by Mac OS X Server 10.3 or later.
Note: Tested maximums reflect the test configuration and do not represent a guarantee of performance. Your experience may vary depending on factors such as computer model, microprocessor speed, network conditions, hard disk space, disk fragmentation, installed memory (RAM), client load, total number of services running on the server, or other software used on the server. Information left blank in the table is not yet available.
Tested and Theoretical Maximums
| Component | Maximum | Tested | Theoretical |
| AFP Server | Number of Connected Users | 1000 | N/A |
| AFP Server | Shareable Volume Size | 16 TB | 16 TB |
| AFP Server | Number of Files per Volume | 250 million | 2 147 483 646 |
| AFP Server | Number of Shared Items (Share Points) | 255 | 255 |
| BSD Kernel | Number of Processes (Note 1) | 2048 | |
| BSD Kernel | Number of Processes per UID (Note 2) | 1000 | |
| BSD kernel | Size of Argument | 256 KB | 256 KB |
| Core OS | Number of Open Files | 1000 | 12288 |
| Directory Services | Number of Groups | 10000 | |
| Directory Services | Number of Users | 10000 | |
| Directory Services | Number of Users per Group | 10000 | |
| Directory Services | Number of Groups per User | 16 | 16 |
| FTP Server | Number of Connected Users | 16384 | |
| FTP Server | Number of Connections per User | 16384 | |
| Macintosh Manager Client | Number of Approved Desktop Printers Per Workgroup | 5 | 10 |
| Mail Server | Number of Incoming SMTP Connections | 256 | 2000 |
| Mail Server | Number of Outgoing SMTP Connections | 256 | 2000 |
| Mail Server | Number of POP Connections | 512 | 2000 |
| Mail Server | Number of IMAP Connections | 512 | 2000 |
| Mail Server | Number of Messages in System (Note 3) | 1.5 million | File system maximum |
| Mail Server | Number of Entries in SMTP Server Rejection List | 128 | N/A |
| Mail Server | Number of Entries in Approved SMTP Hosts List | 128 | N/A |
| NetBoot | Number of Clients Simultaneously Using NetBoot | 50 | |
| Print Server | Number of Queues | 60 | |
| QTSS | Number of Connected Users per Streamed File | 12288 | |
| QTSS | Number of Simultaneously Streamed Files | 12288 | |
| QTSS | Number of Connected Users | 12288 | |
| SMB Server | Number of Open Files | 1000 | 12288 |
| SMB Server | Number of Connected Users | 1000 | 1000 |
| User Accounts | User Comments Character Limit | 54662 | N/A |
| Web Server | Number of Connected Users | 2048 | |
| Web Server | Number of Open Files | 12288 |