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  1. 184-pin DIMM (2)
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RamCity guarantees 100% that all modules below are compatible with the HP/Compaq Pavilion 900 Series Desktop 990c

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RamCity 1GB CL2.5 184-pin DIMM
Part #. ACI • DDR-266 / PC2100 • CL2.5 • 2.5V • 16-chip 64Mx8 •  more info
Buy new: $115.99 $90.99

5 in Stock Free Shipping Guaranteed Compatible

Kingston 1GB CL2.5 184-pin DIMM
Part #. KTC-PR266/1G • CL2.5 • 2.5V •  more info
Buy new: $160.99 $125.99

1 in Stock Free Shipping Guaranteed Compatible

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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
Standard Memory:
  • 1GB (Removable)
Maximum Memory:
  • 2GB
Expansion:
  • 2 Sockets
CPU/Chipset:
  • Intel Pentium 4 2.2 GHz Intel 845E
Bus Architecture:
  • AGP; PCI
Mfr's System P/N's:
  • P6327A
Upgrade Path:
  • Virtually any configuration up to 2GB can be reached using 1GB module.