Replacement for A3863A: Drop-In Alternatives We Stock
Looking for a replacement for the A3863A (A3863A - HP 512MB PC100 100MHz ECC Registered High-Density CL2 278-Pin DIMM Memory Module for L-Class 9000 Server)? 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 A3863A
| SKU | A3863A |
|---|---|
| Product | A3863A - HP 512MB PC100 100MHz ECC Registered High-Density CL2 278-Pin DIMM Memory Module for L-Class 9000 Server |
| Current price | $259.50 |
| Stock status | In Stock |
| Detail page | View A3863A › |
Drop-in replacements for A3863A
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.
A5841-60001 - HP 512MB PC100 100MHz ECC Registered 278-Pin High Density DIMM Memory Module
SKU: A5841-60001
Price: $165.79
A5841-69001 - HP 512MB PC100 100MHz ECC Registered 278-Pin High Density DIMM Memory Module
SKU: A5841-69001
Price: $165.79
A3863-69001 - HP 512MB PC100 100MHz ECC Registered High-Density CL2 278-Pin DIMM Memory Module for L-Class 9000 Server
SKU: A3863-69001
Price: $259.50
A3863-66501 - HP 512MB PC100 100MHz ECC Registered High-Density CL2 278-Pin DIMM Memory Module for L-Class 9000 Server
SKU: A3863-66501
Price: $292.04
A5864A - HP 2GB Kit (2x1GB) PC100 100MHz ECC Registered High Density CL2 278-Pin DIMM Memory for 9000 and N-Class Servers
SKU: A5864A
Price: $186.75
A5841A - HP 1GB Kit (2x512MB) PC100 100MHz ECC Registered 278-Pin High Density DIMM Memory
SKU: A5841A
Price: $242.41
A5797A - HP 512MB Kit (2x256MB) PC133 133MHz ECC Registered High-Density CL2 278-Pin DIMM Memory for L-Class 9000 Server
SKU: A5797A
Price: $96.84
A4923-60001 - HP 512MB PC120 120MHz ECC Registered High-Density 278-Pin DIMM Memory Module for 9000 and N-Class Servers
SKU: A4923-60001
Price: $113.68
A5798-60001 - HP 512MB PC133 133MHz ECC Registered High-Density 278-Pin System Specific DIMM Memory Module for 9000 A / L Class Servers
SKU: A5798-60001
Price: $113.68
A5798-60002 - HP 512MB PC133 133MHz ECC Registered High-Density 278-Pin System Specific DIMM Memory Module for 9000 A / L Class Servers
SKU: A5798-60002
Price: $113.68
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.