Replacement for MEM2821-256D: Drop-In Alternatives We Stock
Looking for a replacement for the MEM2821-256D (MEM2821-256D - Cisco 256MB DDR DIMM Memory Module for Cisco 2821/2851 Routers)? Pro Disk Network ships Cisco 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 MEM2821-256D
| SKU | MEM2821-256D |
|---|---|
| Product | MEM2821-256D - Cisco 256MB DDR DIMM Memory Module for Cisco 2821/2851 Routers |
| Current price | $133.76 |
| Stock status | In Stock |
| Detail page | View MEM2821-256D › |
Drop-in replacements for MEM2821-256D
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.
PWR-2821-51-AC-IP - Cisco PoE Power Supply for Cisco 2821 / 2851 Routers
SKU: PWR-2821-51-AC-IP
Price: $400.45
ASA5510-CF-256MB - Cisco 256MB CompactFlash (CF) Memory Card for ASA5510 Series Sa5500-Cf-256MB=
SKU: ASA5510-CF-256MB
Price: $116.33
ASA5520-CF-256MB - Cisco 256MB CompactFlash (CF) Memory Card for ASA5520 Series Sa5520-Cf-256MB=
SKU: ASA5520-CF-256MB
Price: $116.33
15-9164-01 - Cisco 256MB DDR-333MHz PC2700 ECC Unbuffered CL2 184-Pin DIMM 2.5V Memory Module
SKU: 15-9164-01
Price: $128.18
15-9164-01-1 - Cisco 256MB DDR-333MHz PC2700 ECC Unbuffered CL2.5 184-Pin DIMM Memory Module
SKU: 15-9164-01-1
Price: $128.18
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.