Replacement for 257973-B21: Drop-In Alternatives We Stock
Looking for a replacement for the 257973-B21 (257973-B21 - Compaq 512MB Kit (2 X 256MB) DDR-266MHz PC2100 ECC Registered CL2.5 184-Pin DIMM Memory)? Pro Disk Network ships 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 257973-B21
| SKU | 257973-B21 |
|---|---|
| Product | 257973-B21 - Compaq 512MB Kit (2 X 256MB) DDR-266MHz PC2100 ECC Registered CL2.5 184-Pin DIMM Memory |
| Current price | $173.68 |
| Stock status | In Stock |
| Detail page | View 257973-B21 › |
Drop-in replacements for 257973-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.
257974-B21 - Compaq 1GB Kit (2 X 512MB) DDR-266MHz PC2100 ECC Registered CL2.5 184-Pin DIMM Memory for ProLiant Servers
SKU: 257974-B21
Price: $236.21
73P2872 - IBM 512MB Kit (2 X 256MB) DDR-266MHz PC2100 ECC Registered CL2.5 184-Pin DIMM 2.5V Memory
SKU: 73P2872
Price: $71.58
2N922 - Dell 512MB Kit (2 X 256MB) DDR-266MHz PC2100 ECC Registered CL2.5 184-Pin DIMM Memory for PowerEdge Servers
SKU: 2N922
Price: $71.58
300678-B21 - HP 512MB Kit (2 X 256MB) DDR-266MHz PC2100 ECC Registered CL2.5 184-Pin DIMM Memory for ProLiant Servers
SKU: 300678-B21
Price: $71.58
Dataram DRF250/512 512MB Kit (2 X 256MB) DDR-266MHz PC2100 ECC Registered CL2.5 184-Pin DIMM Memory
SKU: DRF250-512
Price: $154.87
Dataram DRHZX6000/512 512MB Kit (2 X 256MB) DDR-266MHz PC2100 ECC Registered CL2.5 184-Pin DIMM Memory
SKU: DRHZX6000-512
Price: $154.87
Dataram DRIX360/512 512MB Kit (2 X 256MB) DDR-266MHz PC2100 ECC Registered CL2.5 184-Pin DIMM Memory
SKU: DRIX360-512
Price: $154.87
Dataram DRS240/512 512MB Kit (2 X 256MB) DDR-266MHz PC2100 ECC Registered CL2.5 184-Pin DIMM Memory
SKU: DRS240-512
Price: $154.87
Dataram DRH370/512 512MB Kit (2 X 256MB) DDR-266MHz PC2100 ECC Registered CL2.5 184-Pin DIMM Memory
SKU: DRH370-512
Price: $154.87
Dataram DRSV65/512 512MB Kit (2 X 256MB) DDR-266MHz PC2100 ECC Registered CL2.5 184-Pin DIMM Memory for Sun Fire V60X 65X
SKU: DRSV65-512
Price: $154.87
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.