Alternative to 655636-B21: Better-Value Equivalents in Stock
Comparing the 655636-B21 (655636-B21 - HP Smart Array P721m 6GB/s 4-Ports Ext PCI-Express Mezzanine SAS Controller with 512MB Cache) against alternatives? Pro Disk Network stocks 12 similar HP parts that offer comparable performance at different price points. Each option below is in-stock, US-warehoused, and tested-and-certified before ship. Bulk pricing is available on quantities of 5+; B2B procurement can use Net 30 with PO.
About the 655636-B21
| SKU | 655636-B21 |
|---|---|
| Product | 655636-B21 - HP Smart Array P721m 6GB/s 4-Ports Ext PCI-Express Mezzanine SAS Controller with 512MB Cache |
| Current price | $212.63 |
| Stock status | In Stock |
| Detail page | View 655636-B21 › |
Alternatives to 655636-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.
631674-B21 - HP Smart Array P421 6GB 2-Ports Ext PCI-Express 3.0 SAS RAID Controller with 2GB for G8
SKU: 631674-B21
Price: $194.74
610671-002 - HP Smart Array P421 6GB 2-Ports Ext PCI-Express 3.0 X8 SAS RAID Controller
SKU: 610671-002
Price: $704.62
AM312A - HP Integrity Smart Array P812 6GB 4-Port Ext PCI-Express SAS Controller with 1GB Cache
SKU: AM312A
Price: $163.16
631667-B21 - HP Smart Array P222 6GB 1-Port Ext PCI-Express 3.0 X8 SAS RAID Controller
SKU: 631667-B21
Price: $173.68
631673-B21 - HP Smart Array P421 6GB 2-Port Ext PCI-Express 3.0 X8 SAS RAID Controller
SKU: 631673-B21
Price: $194.74
AP846B - HP Modular Smart Array P2000 G3 Fc Dual Controller Sff Modular Smart Array System Hard Drive Array 24-Bay 0
SKU: AP846B
Price: $1,450.53
698536-B21 - HP Smart Array P731m 6GB 4-Ports Ext Mezzanine SAS Controller with 512MB Fbwc
SKU: 698536-B21
Price: $184.21
726826-B21 - HP Smart Array P441 PCI Express 3.0 X8 12GB 2-Port Ext SAS Controller Card
SKU: 726826-B21
Price: $275.79
615418-B21 - HP Smart Array P822/2GB FBWC PCI-Express 6GB/s 2-Ports Internal/4-Ports External SAS/SATA RAID Controller Card
SKU: 615418-B21
Price: $155.79
698531-B21 - HP Smart Array P431/2GB Fbwc 12GB 2-Ports Ext SAS Controller
SKU: 698531-B21
Price: $547.37
How we pick alternatives
Every recommendation above was selected using these criteria:
- Spec parity — capacity, speed, port count, and form factor matched within a 10% tolerance
- Price spread — alternatives shown across the price range, so you can pick on budget
- Brand mix — both OEM-equivalent and trusted aftermarket, all certified
- Reliability data — preferred parts have failure rates below 1% in our 18-month return tracking
- In stock today — shipping today, not 4-6 weeks from now
Want a side-by-side spec comparison?
We can prepare a written comparison covering throughput, power draw, form factor and validated compatibility. Email sales@prodisknetwork.com or call +1 (407) 205-8454 — most quotes ship within 4 business hours.