Replacement for AB556A: Drop-In Alternatives We Stock
Looking for a replacement for the AB556A (AB556A - HP 4GB DDR2-533MHz PC2-4200 ECC Registered CL4 240-Pin DIMM 1.8V Single Rank Memory Module)? 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 AB556A
| SKU | AB556A |
|---|---|
| Product | AB556A - HP 4GB DDR2-533MHz PC2-4200 ECC Registered CL4 240-Pin DIMM 1.8V Single Rank Memory Module |
| Current price | $163.22 |
| Stock status | In Stock |
| Detail page | View AB556A › |
Drop-in replacements for AB556A
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.
AB454A - HP 4GB Kit (2 X 2GB) DDR2-533MHz PC2-4200 ECC Registered CL4 240-Pin DIMM 1.8V Memory
SKU: ab454a
Price: $71.58
A9849-60301 - HP 4GB DDR2-533MHz PC2-4200 ECC Registered CL4 240-Pin DIMM 1.8V Dual Rank Memory Module
SKU: A9849-60301
Price: $73.68
AD344A - HP 4GB Kit (2 X 2GB) DDR2-533MHz PC2-4200 ECC Registered CL4 240-Pin DIMM 1.8V Dual Rank Memory
SKU: AD344A
Price: $128.42
AB566AX - HP 4GB DDR2-533MHz PC2-4200 ECC Registered CL4 240-Pin DIMM Single Rank Memory Module
SKU: AB566AX
Price: $128.42
AD275A - HP 4GB Kit (2 X 2GB) DDR2-533MHz PC2-4200 ECC Registered CL4 240-Pin DIMM 1.8V Dual Rank Memory
SKU: AD275A
Price: $128.42
AB564A - HP 4GB Kit (4 X 1GB) DDR2-533MHz PC2-4200 ECC Registered CL4 240-Pin DIMM 1.8V Memory
SKU: AB564A
Price: $128.42
AB561-60001 - HP 4GB DDR2-533MHz PC2-4200 ECC Registered CL4 240-Pin DIMM Dual Rank Memory Module
SKU: AB561-60001
Price: $144.01
RP907A - HP 4GB DDR2-533MHz PC2-4200 ECC Registered CL4 240-Pin DIMM 1.8V Memory Module
SKU: RP907A
Price: $144.01
RP907AA - HP 4GB DDR2-533MHz PC2-4200 ECC Registered CL4 240-Pin DIMM 1.8V Memory Module
SKU: RP907AA
Price: $144.01
AB455A - HP 8GB Kit (2 X 4GB) DDR2-533MHz PC2-4200 ECC Registered CL4 240-Pin DIMM 1.8V Dual Rank Memory
SKU: AB455A
Price: $147.37
A9849-69001 - HP 4GB DDR2-533MHz PC2-4200 ECC Registered CL4 240-Pin DIMM 1.8V Dual Rank Memory Module
SKU: A9849-69001
Price: $163.22
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.