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RamCity guarantees 100% that all modules below are compatible with the HP/Compaq Pavilion a1000 Series Desktop a1550a

Part #. ABD • DDR2-400 / PC2-3200 • CL3 • 1.8V • 16-chip 64M x8 • more info

Buy new: $92.99 $72.99

Part #. ADA • DDR2-533 / PC2-4200 • CL4 • Dual Rank • 1.8V • 16-chip 64x8 • more info

Buy new: $91.99 $71.99

We guarantee your memory upgrade will be 100% compatible, or return it within 1 Whole Year for a full refund.

Need some help installing your upgrade? See our guides and videos.

System Specifications

Comments:

MODULES MAY BE INSTALLED ONE AT A TIME; however, they must be added in like pairs to take advantage of Dual Channel Mode.
This system supports both DDR2-400 (KTH-XW4200/xx) and DDR2-533 (KTH-XW4200AN/xx) memory.
When mixed, the memory will default to DDR2-400.

Standard Memory:

Maximum Memory:

Expansion:

CPU/Chipset:

Upgrade Path:

Virtually any configuration up to 2GB can be reached using any combination of 512MB and 1GB modules.