Guaranteed compatible upgrades for:

HP/Compaq ProBook Series Notebook 4420s


System Specifications
Maximum Memory:
  • 4 GB using a 32-bit Operating System
  • 8 GB using a 64-bit Operating System
Expansion:
  • 2 Sockets
Standard Memory:
  • 2 GB (Removable) or
  • 4 GB (Removable) or
  • 8 GB (Removable)
CPU/Chipset:
  • Intel Core i3 Intel HM57
  • Intel Core i5 Intel HM57
  • Intel Core i7 Intel HM57
Bus Architecture:
  • SSD - SATA 2.5-inch 9.5mm; USB
Mfr's System P/N's:
  • VM118AV; WH291UT; WH292UT; WH293UT; WH301UT; WJ339AA; WJ340AA; WJ341AA; WP460PA; WQ429LA; WQ430LA; WQ944PA; WQ945PA; WR004PA; WR009PA; WT387PA; WT388PA; WT389PA; WT390PA; WT391PA; WT392PA; WT393PA; WT394PA; WT395PA; WT396PA; WT397PA; WT398PA; WT399PA; WT400PA; WT401PA; WT402PA; WT403PA; WT404PA; WT551PP; WT552PP; WT695PA; WT696PA; WT724PA; WT924PA; WT925PA; WW231LA; WW340PA; WW358PA; WW359PA; WW363PA; WW371PA; WW861LA; WX958PP
Upgrade Path:
  • Virtually any configuration up to 8GB can be reached using any combination of 2 and 4GB modules.
Comments:
  • MODULES MUST BE ORDERED AND INSTALLED IN PAIRS for Dual Channel mode.
  • If 4GB is installed, the recognized memory may be reduced to 3.5GB or less (depending on system configuration and memory allocation).
  • Maximum configurations require a 64-bit operating system