Lenovo ThinkPad W520 specifications:
Processor: Intel Core i7-2620M @ 2.7 GHz, Intel Core i7-2720QM @ 2.2 GHz, Intel Core i7-2820QM @ 2.3 GHz, Intel Core i7-2920XM @ 2.5 GHz
Graphics: NVIDIA Quadro 1000M 2 GB w/ Optimus
Memory: 4 GB DDR3 @ 1,333 MHz, 6 GB DDR3 @ 1,333 MHz, 8 GB DDR3 @ 1,333 MHz, 16 GB DDR3 @ 1,333 MHz
Storage: 320 GB HDD @ 7,200 rpm, 500 GB HDD @ 7,200 rpm, 128 GB SSD, 160 GB SSD
Display: 15" LED 1,366 × 786, 15" LED 1,600 × 900, 15" LED 1,920 × 1,080
Camera: 720p HD
Wireless: Bluetooth 3.0, 3G, b/g/n Wi-Fi,
Battery: 6-cell 2.6 Ah Li-Ion, 9-cell 2.8 Ah Li-Ion
Base price: $1,500
Lenovo ThinkPad T420s specifications:
Processor: Intel Core i5-2520M @ 2.5 GHz, Intel Core i5-2540M @ 2.6 GHz
Graphics: Intel HD Graphics 3000
Memory: 2 GB DDR3 @ 1,333 MHz, 4 GB DDR3 @ 1,333 MHz, 6 GB DDR3 @ 1,333 MHz, 8 GB DDR3 @ 1,333 MHz
Storage: 250 GB HDD @ 5,400 rpm, 320 GB HDD @ 5,400 rpm, 320 GB HDD @ 7,200 rpm, 128 GB SSD, 160 GB SSD
Display: 14" LED 1,600 × 900
Camera: 720p HD
Wireless: Bluetooth 3.0, 3G, b/g/n Wi-Fi, WiMAX
Battery: 6-cell Li-Ion
Base price: $1,200
Lenovo ThinkPad Edge E420s specifications:
Processor: Intel Core i3-2310M @ 2.1 GHz, Intel Core i5-2410M @ 2.3 GHz
Graphics: Intel HD Graphics 3000
Memory: 4 GB DDR3 @ 1,333 MHz, 6 GB DDR3 @ 1,333 MHz, 8 GB DDR3 @ 1,333 MHz
Storage: 250 GB HDD @ 5,400 rpm, 320 GB HDD @ 7,200 rpm, 128 GB SSD
Display: 14" LED 1,366 × 768
Wireless: Bluetooth 3.0, 3G, b/g/n Wi-Fi, WiMAX
Battery: Li-Polymer 48.8 Wh
Base price: $700
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