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HP EliteBook 840G1: Sometimes it's an Ultrabook, sometimes it's not • The Register
HP EliteBook 840 G1, 840 G2, 840 G3, 840 G4 Laptop 2.5 HDD Hard Drive/SSD Drive | eBay
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What SSD i can use in Elitebook 840 G1??? - HP Support Community - 8038187
Upgrading SSD in HP 840 G1 EliteBook, 840 G2 or 840 G3 Laptop, Solid State Hard Drive - YouTube