The S1112 is the first Power11 system available in IBM i Software Tier P05, which means it is also the first Power11 generation buyers can compare directly against the P05-tier systems they are most likely replacing. This page lines up the S1112's confirmed CPW, memory bandwidth, storage, and PCIe figures against the Power10 S1014, the Power10 S1012, the Power9 S914, and the Power8 S814 so the generational jump (or lack of one, in a few specific columns) is visible at a glance.
For the S1112's own spec profile and EJMT/EJSV processor breakdown, start with the IBM Power 11 Specs page or the S1112 model listing. This page is specifically about how it compares against what came before it.
CPW: total and per-core, across all five P05-tier systems
| System | Machine type / model | Processor | CPW per core | Max P05 CPW | vs. S1112 |
|---|---|---|---|---|---|
| Power11 S1112 | 9242-21B | EJMT, 4-core, 3.6–4.0 GHz | 29,325 | 117,300 | Baseline |
| Power10 S1014 | 9105-41B | EPG0, 4-core, 3.0–3.9 GHz | 26,575 | 106,300 | S1112 is 10.3% higher |
| Power10 S1012 (4-core) | 9028-21B | EPG7, 4-core, 3.0–3.9 GHz | 27,825 | 111,300 | S1112 is 5.4% higher |
| Power10 S1012 (1-core) | 9028-21B | EPG3, 1-core, 3.0–3.9 GHz | 29,000 | 29,000 | S1112 is 1.1% higher per core |
| Power9 S914 | 9009-41A/41G | EP50, 4-core, 2.3–3.8 GHz | 13,125 | 52,500 | S1112 is 123.4% higher |
| Power8 S814 | 8286-41A | EPXK, 4-core, 3.02 GHz | 9,360 | 37,440 | S1112 is 213.2% higher |
The one-core S1012 row is the one buyers licensing or budgeting by core should look at twice. Per active core, a single-core S1012 (29,000 CPW) is nearly identical to an S1112 core (29,325 CPW), a gap of about 1.1%. The S1112's advantage over a four-core S1012 (5.4%) is mostly a core-count story, not a per-core architecture leap.
Memory bandwidth: a bigger gap than CPW alone suggests
| System | Memory bandwidth | vs. S1112 |
|---|---|---|
| Power11 S1112 | 256 GB/s | Baseline |
| Power10 S1014 | 204 GB/s | S1112 is 25.5% higher |
| Power10 S1012 | 102 GB/s | S1112 is 151% higher |
| Power9 S914 | 170 GB/s | S1112 is 50.6% higher |
| Power8 S814 | 192 GB/s | S1112 is 33.3% higher |
The eight-year-old Power8 S814 (192 GB/s) actually out-bands the more recent Power10 S1012 (102 GB/s), a byproduct of DDR4 CDIMM vs. ISDIMM design choices rather than a straight generational line. For Db2 for i-heavy or batch-heavy workloads, check bandwidth independently of how new the system is, not as a given.
Storage: the S1112's advantage depends on what you're replacing
| System | Max internal IBM i storage | vs. S1112 |
|---|---|---|
| Power11 S1112 | 12.8 TB raw / 6.4 TB mirrored | Baseline |
| Power10 S1014 | 6.4 TB raw / 3.2 TB mirrored | S1112 provides 2x the capacity |
| Power10 S1012 | 12.8 TB raw / 6.4 TB mirrored | Equal |
| Power9 S914 | 6.4 TB raw / 3.2 TB mirrored | S1112 provides 2x the capacity |
| Power8 S814 | 3 TB | S1112 provides ~4.27x the capacity |
Replacing an S1012 specifically means internal storage capacity doesn't change at all; the upgrade case there has to come from bandwidth, usable IBM i memory, or I/O drawer support instead. Coming from an S1014 or S914 doubles capacity. Coming from an S814, it's more than a fourfold increase.
PCIe slots: the one place the S1112 doesn't win
| System | Maximum PCIe slots |
|---|---|
| Power9 S914 | 8 (3x Gen4 x16, 5x Gen4 x8) |
| Power8 S814 | 8 listed (2x x16, 5x x8 specifically enumerated) |
| Power10 S1014 | 5 (mixed Gen4/Gen5) |
| Power11 S1112 | 4 (2x Gen4 x16, 2x Gen4 x8) |
| Power10 S1012 | 4 (2x Gen4 x16, 2x Gen4 x8), no external I/O drawer support |
This is the one spec where newer isn't better: the S1014 has one more PCIe slot than the S1112, and both the S914 and S814 have double. Shops with a lot of network, Fibre Channel, SAS, or tape adapters, particularly those migrating off an S914 or S814, should inventory existing adapter counts before assuming a straightforward upgrade path. The optional ENZ0 expansion drawer helps close the gap but is an added component, not a built-in slot.