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My Thinkpad W520 despite some clocking issues while on battery. I upgraded it to 16gb ram : r/thinkpad
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Memory RAM | 4GB - Lenovo ThinkPad W520 W-Series - (OEM-# 55Y3711, 55Y3717, 78Y7385) - 1333MHz, Unbuffered, 1,5V
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Lenovo ThinkPad T510, T520, T530, W 510, W520, W530 Keyboard removal (for RAM Memory Upgrade) | Lenovo thinkpad, Memory upgrade, Ram memory
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