HP ProLiant Power Supply Buying Guide — 460W, 750W, 800W, 1200W, 1600W Common Slot Across Gen8-Gen10
How to pick the right HP power supply for your ProLiant server. Common Slot form factor explained, wattage selection by CPU/GPU/drive load, 80 PLUS efficiency tiers, hot-swap procedure, and the exact part numbers for DL360, DL380, DL580 and ML350 across Gen8, Gen9, and Gen10.
Why HP Power Supply Selection Matters
The wrong HP power supply at best refuses to boot. At worst, it boots but throws iLO warnings, runs the fans at full speed for years, and silently shortens the life of every component in the chassis from capacitor stress.
This guide covers HP ProLiant Common Slot and Flex Slot power supply tiers — from the entry 460W up to the 1600W Flex Slot Platinum for DL580 Gen10 — with the actual part numbers you should order for each common upgrade or replacement scenario in 2026.
What is HP Common Slot (CS)?
Common Slot is HP's standardized server PSU form factor introduced with ProLiant G6. CS PSUs share identical physical dimensions and connector pinouts so the same physical unit can be reused across DL360, DL380, ML350, DL385, and many more. That dramatically simplifies spares planning for fleets — one spare 750W CS PSU can cover several server models.
Three rules to remember:
- CS PSUs in a redundant pair must be the same wattage and same model line
- CS PSUs are not cross-compatible across generations — Gen8 CS PSUs do not work in Gen10 servers
- Hot-plug only works in N+1 redundant configurations (two PSUs installed, both healthy)
Wattage Selection by Workload
| Server Load | Recommended PSU | Why |
|---|---|---|
| Single-CPU DL380p Gen8 base config | 460W (643954-001) | Adequate for a 1× E5-2630, 32 GB RAM, 4× SAS drive config. |
| Single-CPU + GPU or 8+ drives | 750W (643955-001) | Headroom for SAS expanders and add-in cards. |
| Dual-CPU rack server (DL360/DL380) | 800W Platinum (754381-001 / 865414-B21) | Flex Slot Platinum: 754381-001 for Gen9, 865414-B21 for Gen10. |
| GPU-heavy DL385 / DL380 with multiple GPUs | 1200W (656364-B21 / 660185-001) | Common Slot Platinum Plus for DL380p/DL385p Gen8; size with HPE Power Advisor. |
| Quad-CPU DL580 Gen10 | 1600W Flex Slot Platinum (830272-B21) | Largest PSU on the DL580 Gen10 QuickSpecs; high-line (200-240VAC) input only. |
Rule of thumb: size the PSU so that one unit alone can carry full system load with 20% headroom. That way, when one PSU fails the server keeps running at 100%.
80 PLUS Efficiency Tiers Explained
| Tier | Efficiency at 50% Load | Notes |
|---|---|---|
| 80 PLUS Bronze | 82-85% | Found on older Gen5/Gen6 PSUs. Acceptable for non-production use. |
| 80 PLUS Gold | 88-92% | Common in Gen7/Gen8 entry models. |
| 80 PLUS Platinum | 92-94% | HP "Platinum Plus" — most Gen8 Common Slot and Gen9 Flex Slot PSUs. |
| 80 PLUS Titanium | 94-96% | Gen10 high-efficiency. Also guarantees 90% efficiency at 10% load. |
For a 750W PSU running a typical 400W server load, going from Gold (~89%) to Platinum (~94%) saves about 24W of waste heat.
DL380 Power Supply Part Numbers Across Generations
DL380 Gen8 (the workhorse — most replaced)
- 460W: 643954-001 — Common Slot Platinum Plus
- 460W variant: 511804-001 — Common Slot Redundant
- 750W: 643955-001 — Common Slot Platinum
- 1200W: 656364-B21 — Common Slot Platinum Plus
- 1200W: 660185-001 — Common Slot RPS
- 1200W: DPS-1200SB — Delta-built RPS
DL380 Gen9
- 500W: 754377-001
- 800W: 754381-001 (Platinum)
DL380 Gen10
- 500W: 865408-B21
- 800W: 865414-B21 (Platinum)
It covers most dual-Xeon-Scalable configs with margin for add-in cards.
DL360 Power Supply Part Numbers
DL360 Gen8
- 750W: PS-2751-7C-LF — Common Slot 750W
DL360 Gen9
- 500W: 720478-B21
- 800W: 754381-001
DL360 Gen10
- 500W: 865408-B21
- 800W: 865414-B21
DL580 High-Wattage PSUs
The DL580 is HP's quad-CPU enterprise rack server. It demands far more power than the DL360/DL380 line:
- DL580 Gen8: 684532-B21 (1500W Platinum Plus)
- DL580 Gen10: 830272-B21 (1600W Flex Slot Platinum) or 865414-B21 (800W Flex Slot Platinum)
For DL580 Gen10, HPE recommends running the HPE Power Advisor before choosing between the 800W and 1600W kits; the 1600W kit supports high-line (200-240VAC) input only.
ML350 Tower Server PSUs
The ML350 uses the same Common Slot (Gen8) or Flex Slot (Gen9/Gen10) PSUs as the DL380 of the same generation:
- ML350 Gen8: 643955-001 (750W) or 643956-001 (1200W)
- ML350 Gen9: 720479-B21 / 754381-001
- ML350 Gen10: 865408-B21 / 865414-B21
How to Replace an HP ProLiant PSU (Hot-Swap, Zero Downtime)
For redundant N+1 configurations, replacement takes about 5 minutes:
- Identify the failed unit. On the PSU itself, solid green = normal; off = system off or power supply failed. Cross-check in iLO under Power & Thermal > Power Supply Health.
- Verify redundancy is healthy. The other PSU must show solid green and be sized for full system load. If the surviving PSU is marginal, schedule a maintenance window — do not hot-swap.
- Remove the failed PSU. Squeeze the orange release tab on the handle and pull straight out.
- Insert the replacement. Slide in firmly until the latch clicks. The fan should spin up immediately. Wait 30 seconds for the iLO handshake.
- Confirm online. Solid green LED on the new unit. iLO should log "Power Supply Inserted" and "Power Supply OK". Power redundancy returns to "OK".
For non-redundant (single PSU) configs, the server must be shut down before replacement.
How to Tell if Your HP PSU is Failing
Symptoms in order of urgency:
- PSU LED off while the server is powered on — the power supply has failed; replace it
- iLO IML log entries "Power Supply Failure" or "AC Lost"
- Unexpected shutdowns under load (other PSU healthy)
- Fans at full RPM when system is idle (PSU temp sensor issue)
- Audible buzzing or whining from the PSU (capacitor failure imminent)
In an N+1 configuration a failed PSU can be hot-swapped; without N+1, a PSU failure takes down the server.
Buying Refurbished vs New HP PSUs
| Type | Best For |
|---|---|
| New OEM HP | Fresh deployments under HP support |
| Refurbished | Replacements for out-of-warranty servers (90-day advance-replacement warranty) |
For production servers out of HP warranty, refurbished PSUs are the sweet spot. Pro Disk Network's refurbished parts carry a 90-day advance-replacement warranty. For mission-critical workloads, source matched pairs of the same date code where possible.
Common Mistakes to Avoid
- Mixing wattages. Two different wattage PSUs in a redundant pair will cause iLO mismatch warnings and may force one PSU into standby.
- Ignoring 80 PLUS rating differences. A Platinum Plus and a regular Platinum may not be paired in N+1.
- Assuming Gen-cross compatibility. Gen8 CS does not equal Gen10 CS, despite identical-looking form factors.
- Skipping the iLO check after replacement. Always verify "Power Redundancy: OK" in iLO before walking away.
- Buying the cheapest non-HP PSU. Will boot, may trigger persistent warnings, may run fans at higher speed permanently.
Pro Disk Network — HP PSU Stock and Same-Day Shipping
Pro Disk Network stocks HP and HPE power supplies, including Common Slot and Flex Slot units for Gen7 through Gen10, plus HPE/Aruba switch PSUs (JL085A, JL086A, JL593A, J9828A, JG544A).
In-stock items ordered before 3pm ET ship same day. B2B / Net 30 terms available for repeat customers and verified businesses.
Browse HP Power Supplies
- HP Power Supplies — All Models
- HP 460W PSUs · HP 750W PSUs
- HP 800W Platinum · HP 1200W Platinum Plus
- HP 1600W Flex Slot Platinum (Gen10)
- DL380 Power Supply · DL360 Power Supply
- DL580 Power Supply · ML350 Power Supply
Related Guides
- Server PSU Replacement Guide (HP / Dell / Lenovo)
- HP Network Adapters Buying Guide (FLR / FLB / FlexFabric)
- HPE Networking hub · Enterprise / B2B Net 30
Need help matching a PSU to your exact ProLiant model? Email sales@prodisknetwork.com with the server SKU (or iLO screenshot showing system info) and we will identify the compatible part numbers.