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A-Tech 8GB Module for Lenovo ThinkPad X230 Laptop & Notebook Compatible DDR3/DDR3L PC3-12800 1600Mhz Memory Ram (ATMS350729B12351X1) at Amazon.com
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Memory RAM | 4GB - Lenovo ThinkPad X230 Tablet X-Series - (OEM-# 0A65723) - 1600MHz, Unbuffered, 1,5V
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ThinkPad X230 – faster RAM and comparison between single channel and dual channel speed – Ioannis Karagiorgos blog
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4Gb (1X4Gb) Sodimm Memory RAM Compatible with Lenovo Thinkpad X230 Tablet Series By CMS A25 - Computer Memory Solutions
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