512GB NGFF M2 2242 SSD Solid State hard drive for HP EliteBook 820 G1,840/850 G1 | eBay
HP EliteBook 840 G1 Laptop 14" Touchscreen Intel i7-4600U 8GB 240GB SSD Win7 Pro | eBay
HP EliteBook 840G1: Sometimes it's an Ultrabook, sometimes it's not • The Register
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