SAP on IBM Power: why the same S/4HANA workload runs twice as fast on Power10
Memory bandwidth, SMT8, RAS and PowerVM consolidation explain the 25–40% TCO advantage of Power over x86 for enterprise S/4HANA — and the small-scale cases where x86 is still the right call.
On paper, SAP S/4HANA runs on both x86 and IBM Power. In practice, the same finance workload can be twice as fast, need 60% fewer nodes, and shrink end-of-day batches from 4 hours to under 1 when deployed correctly on Power10. This article explains why.
1. HANA is an in-memory database — memory architecture is everything
S/4HANA keeps its full working set in RAM. Every query is bound by memory bandwidth, not disk I/O. Power10 delivers ~410 GB/s/socket of memory bandwidth — roughly 2× a comparable x86 Sapphire Rapids. For financial reports that scan hundreds of millions of rows, the difference translates directly to response time.
2. SMT8 changes how you count "cores"
Power10 supports SMT8 — each physical core runs 8 hardware threads. x86 only has SMT2 (Hyper-Threading). For HANA OLAP workloads with many parallel joins, one Power10 core typically equals 4–6 x86 cores in real throughput. That is why a flat "per core" price list does not reflect true TCO.
3. Reliability dominates x86 at enterprise scale
Power10 ships with RAS (Reliability, Availability, Serviceability) as a default: First Failure Data Capture, processor recovery, memory mirroring, transparent CPU sparing. In production we typically see 99.9996% uptime for HANA on Power — under 2 minutes of downtime per year. Comparable x86 clusters sit around 99.95% (~4.4 hours/year). For a bank or conglomerate closing books monthly/quarterly, every minute has a direct cost.
4. PowerVM enables real consolidation
On VMware, each HANA production VM typically needs reservations and complex affinity rules to avoid noisy-neighbor effects. PowerVM with Shared Processor Pool lets you run HANA prod, HANA QA, SAP NetWeaver app servers and other Linux workloads on the same frame — no dedicated hosts required. Real consolidation we have measured at customers: 12 x86 servers (Prod + DR + Dev + QA) collapsed into 2 Power S1024 frames.
5. When x86 is still the right call
A hard truth for the Power camp: if your SAP is small (<1TB HANA), you have no serious DR, and your ops team only knows Linux/x86, the skill cost and SAP-on-Power licensing may not offset the technical wins. Power truly shines from ~2TB HANA upward, when HA targets exceed 99.99%, or when an AIX/IBM i ops team already exists.
Conclusion
SAP on Power is not "expensive legacy" — it is an architectural decision for large workloads with high RAS and real consolidation needs. Measured by 5-year TCO instead of sticker price, Power is typically 25–40% cheaper for enterprise S/4HANA in Vietnam — especially after factoring in SAP licensing, VMware licensing, downtime cost and onshore data center power/cooling.
Evaluating a similar solution?
Our team can advise on architecture, rollout roadmap and TCO — first session free, no commitment.
