Identify Your Power5
Match the machine type to the exact IBM i or System p POWER5 family before you buy a part, compare support, or plan what replaces it.
Power5 is not one machine. IBM sold an i5 and System i line for IBM i work, plus a p5 and System p line for AIX and Linux. The machine type and model on the server label tells you which family you have. On IBM i, DSPSYSVAL QMODEL gives the model and WRKHDWRSC helps capture the hardware around it.
System i entry
The 515, 520, and 525 served smaller IBM i environments. The exact processor feature and software tier still matter.
System i midrange
The 550 and modular 570 carried growing and consolidated IBM i work across very different configurations.
System i enterprise
The 595 was the large-frame IBM i system. Inventory every partition, shared resource, and recovery dependency.
System p
IBM's p5 and System p range ran from the compact p5 185 to the enterprise p5 595 for AIX and Linux.
Once the family matches, record the processor feature, activated capacity, memory, storage, adapters, operating system, licensed software, and recovery design. Those facts decide what support is possible and what a current system must replace.
IBM System i 515 (9406-515 and 9407-515)
The System i 515 appears as 9406-515 in Midland's catalog and 9407-515 in IBM configuration documentation. Keep the code exactly as its source uses it before you price parts, support, or a replacement.
9406-525IBM System i 525 (9406-525)
You have a System i 525. Here is what that means now: a POWER5+ entry model whose activated capacity, IBM i level, software tier, I/O, and recovery evidence need to travel with every quote.
9406-520IBM eServer i5 520 (9406-520)
The 9406-520 is the IBM eServer i5 and System i 520 family. Match its configuration code before you use CPW, software tier, memory, disk, or partition limits in a support or replacement plan.
9406-550IBM eServer i5 550 (9406-550)
You have an i5 550 9406-550. Here's what that means in 2026: IBM's step-up Power5 server, outside IBM's standard support since staged 2019-2020 withdrawals.
9406-570IBM eServer i5 570 (9406-570)
You have an i5 570 9406-570. Here's what that means in 2026: one of the most widely deployed Power5 midrange models, outside IBM's standard support since staged 2019-2020 withdrawals.
9406-595IBM eServer i5 595 (9406-595)
You have an i5 595 9406-595. Here's what that means in 2026: IBM's flagship enterprise Power5 system, outside IBM's standard support since staged 2019-2020 withdrawals.