Memory RAM | 4GB - Lenovo ThinkPad T400 T-Series - (OEM-# 55Y3711, 55Y3717, 78Y7385, 89Y9225 (R.2)) - 1333MHz, Unbuffered, 1,5V
2GB DDR3-1066 (PC3-8500) RAM Memory Upgrade for The IBM ThinkPad T400 Series T400 (7417P5U) (Genuine A-Tech Brand) at Amazon.com
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Lenovo ThinkPad T400 Laptop PC - Intel C2D P8400 2.26GHz, 8GB RAM, 250GB HDD, 14.1 1280x800, Integrated Graphics, DVD, 3x USB 2.0, Windows 10 64-bit, Bilingual, Refurbished - RB-724962753094 at TigerDirect.com
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Refurbished Lenovo Lenovo T400 Laptop Intel Core 2 Duo 4GB RAM 160GB SATA Windows 10 Professional 64 Bit - Walmart.com
Lenovo Thinkpad T400 Intel Core 2 Duo Laptop Computer | PCexchange
![T400] Persistent 1-3-3-1 beep error after attempted 2GB --> 8GB RAM upgrade : r/thinkpad](https://preview.redd.it/kor2ttzbdea81.png?width=846&format=png&auto=webp&s=351a2f9ea41024fdb2ffe4d17ae313f07b49bea1 "T400] Persistent 1-3-3-1 beep error after attempted 2GB --> 8GB RAM upgrade : r/thinkpad")
T400] Persistent 1-3-3-1 beep error after attempted 2GB --> 8GB RAM upgrade : r/thinkpad
Refurbished: Lenovo Thinkpad T400 - 14.1" Intel Core 2 Duo, 2.26 GHz, 2 GB Ram, 160 GB Hard Drive, Windows 7 Home 32-Bit - Newegg.com
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4GB Memory RAM High Speed Upgrade for Lenovo ThinkPad T400 T500. at Amazon.com
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CMS 8GB (2X4GB) DDR3 8500 1066MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Lenovo® Thinkpad T400 2764, 2765, 2766, 2767, 2768 - A35 at Amazon.com
4GB Memory for Lenovo ThinkPad T400 7417, 7420, 7425, 7434-xxx DDR3 PC3-10600 1333MHz SODIMM RAM (PARTS-QUICK Brand) at Amazon.com
4GB (1x4GB) RAM Memory 4 Lenovo ThinkPad T400, T400S A30 817025010538 | eBay
OFFTEK 4GB Replacement Memory RAM Upgrade for IBM-Lenovo ThinkPad T400 (6475-xxx) (DDR3-8500) Laptop Memory at Amazon.com
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8GB 2X4GB Memory RAM for Lenovo ThinkPad T400 2764 204pin 1066MHz PC3-8500 DDR3 SO-DIMM Black Diamond Memory Module Upgrade - Newegg.com
4GB SODIMM IBM-Lenovo Thinkpad T400 2766-xxx 2767-xxx PC3-8500 Ram Memory - Walmart.com - Walmart.com
