Alternative to 81509-B21: Better-Value Equivalents in Stock
Comparing the 81509-B21 (81509-B21 - HPE 8GB PC4-21300 DDR4-2666MHz non-ECC Unbuffered CL19 UDIMM Memory Module) 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 81509-B21
| SKU | 81509-B21 |
|---|---|
| Product | 81509-B21 - HPE 8GB PC4-21300 DDR4-2666MHz non-ECC Unbuffered CL19 UDIMM Memory Module |
| Current price | $234.64 |
| Stock status | In Stock |
| Detail page | View 81509-B21 › |
Alternatives to 81509-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.
HP26D4U9S8MD-8 - HPE 8GB DDR4-2666MHz PC4-21300 non-ECC Unbuffered CL19 288-Pin DIMM 1.2V Single Rank Memory Module
SKU: HP26D4U9S8MD-8
Price: $184.21
879505-S21 - HPE 8GB PC4-21300 DDR4-2666MHz non-ECC Unbuffered CL19 UDIMM Memory Module
SKU: 879505-S21
Price: $234.64
879505R-B21 - HPE 8GB PC4-21300 DDR4-2666MHz non-ECC Unbuffered CL19 UDIMM Memory Module
SKU: 879505R-B21
Price: $234.64
879505R-S21 - HPE 8GB PC4-21300 DDR4-2666MHz non-ECC Unbuffered CL19 UDIMM Memory Module
SKU: 879505R-S21
Price: $234.64
879506-S21 - HPE 8GB PC4-21300 DDR4-2666MHz non-ECC Unbuffered CL19 UDIMM Memory Module
SKU: 879506-S21
Price: $234.64
P02888-B21 - HPE 8GB DDR4-2666MHz PC4-21300 ECC Registered CL19 288-Pin RDIMM 1.2V Single Rank Memory Module
SKU: P02888-B21
Price: $205.36
840756-K91 - HPE 16GB PC4-21300 DDR4-2666MHz ECC Registered CL19 RDIMM Memory Module
SKU: 840756-K91
Price: $186.59
840756-091U - HPE 16GB PC4-21300 DDR4-2666MHz ECC Registered CL19 RDIMM Memory Module
SKU: 840756-091U
Price: $186.59
P18958-B21 - HPE 32GB DDR4-2666MHz PC4-21300 ECC Registered CL19 288-Pin RDIMM 1.2V Dual Rank Memory Module
SKU: P18958-B21
Price: $289.47
HPE 815100-K21#0D1 32GB PC4-21300 DDR4-2666MHz ECC Registered CL19 RDIMM 1.2V Dual-Rank Memory Module
SKU: 815100-K21-0D1
Price: $299.33
P26034-001 - HPE 32GB DDR4-2666MHz PC4-21300 ECC Registered CL19 288-Pin RDIMM 1.2V Dual Rank Memory Module
SKU: P26034-001
Price: $299.33
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.