Replacement for 776445-B21: Drop-In Alternatives We Stock
Looking for a replacement for the 776445-B21 (776445-B21 - HP 550-Watts ATX Power Supply)? Pro Disk Network ships HP drop-in replacements and equivalent modern parts from US inventory. Every alternate below is in-stock today with same-day shipping for orders placed before 2pm ET. If your unit is still under warranty, contact our engineering team — we offer cross-shipping for B2B customers on Net 30 terms.
About the 776445-B21
| SKU | 776445-B21 |
|---|---|
| Product | 776445-B21 - HP 550-Watts ATX Power Supply |
| Stock status | In Stock |
| Detail page | View 776445-B21 › |
Drop-in replacements for 776445-B21
Each part below is currently in our US warehouse, ships same-day for orders before 2pm ET, and includes our 90-day warranty. SKUs link to the full product page with photos, datasheets and B2B quote form.
766879-001 - HP 550-Watts 24-Pin ATX Non Hot-Pluggable Power Supply for Proliant DL180 DL160 Gen9
SKU: 766879-001
Price: $176.84
PS-5301-02 - HP 300-Watts ATX Power Supply For HP Pavilion 510/550 Series
SKU: PS-5301-02
Price: $235.79
867876-B21 - HP 550-Watts ATX Power Supply Kit for ProLiant ML110 Gen10
SKU: 867876-B21
Price: $240.96
776444-B21 - HP 550-Watts 120-230V ATX Hot-Swappable Power Supply for ProLiant ML110 Gen9 Server
SKU: 776444-B21
Price: $735.37
405479-002 - HP 300-Watts ATX 100-240V AC 24-Pin ATX Power Supply with Active Power Factor Correction for DC5100 Desktop System
SKU: 405479-002
Price: $73.68
ATX-300-12Z-REV-DDR - HP 300-Watts ATX Power Supply for Pavilion
SKU: ATX-300-12Z-REV-DDR
Price: $139.22
372357-004 - HP 750-Watts 24-Pin ATX Redundant Hot-Pluggable ATX Power Supply for XW9300 WorkStations
SKU: 372357-004
Price: $189.00
372357-002 - HP 750-Watts 24-Pin ATX Redundant Hot-Pluggable ATX Power Supply for XW9300 WorkStations
SKU: 372357-002
Price: $189.00
372357-001 - HP 750-Watts 24-Pin ATX Redundant Hot-Pluggable ATX Power Supply for XW9300 WorkStations
SKU: 372357-001
Price: $250.53
372357-003 - HP 750-Watts 24-Pin ATX Redundant Hot-Pluggable ATX Power Supply for XW9300 WorkStations
SKU: 372357-003
Price: $250.53
How we pick replacements
Every recommendation above was selected using these criteria:
- Drop-in compatibility — same form factor (2.5"/3.5", PCIe slot, SFP port, etc.), so it fits the original chassis without modification
- Equivalent or better performance — matched on RPM/IOPS/speed/throughput, never downgraded
- Same-brand-preferred — we list the OEM-equivalent first when available, then trusted aftermarket
- Warranty coverage — 90-day Pro Disk warranty on every part, with 1-year option for B2B
- In stock today — never recommend a part that is on backorder
Need help confirming compatibility?
Our engineers validate every replacement against your specific server, switch, or chassis model before shipment. Email sales@prodisknetwork.com with your platform model (e.g., Dell PowerEdge R740, HP DL380 Gen10, Cisco Catalyst 9300) and we will confirm the exact part number that drops into your hardware.