Showing off my cheap egpu setup with my t420. Also does anyone know how to get the pcie on the underside to work? I have a custom bios without the whitelist. :
Lenovo ThinkPad T420/T420i - iFixit
lenovo thinkpad T420 i5 ,6gb ram,hdd 500gb
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ZZZNAYQ MAINBOARD For Lenovo T420 Laptop Motherboard 04W2049 N12P-S1-S-A1 GPU QM67 100% full Working well - AliExpress
2011 14″ Lenovo Thinkpad T420 (NVS4200M) [2nd,2C,M] + RX 460 @ 4Gbps-EC2 (EXP GDC 8.x) + Win10 // DIY HDMI input port: internal & external all in one LCD with button switch
How to upgrade a Lenovo ThinkPad T420 (plus Windows 10 upgrade and display repair) - YouTube
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Lenovo (Renewed) Thinkpad T420-16 GB-240 GB 14-inch Laptop (2nd Gen Core i5/16GB//Windows 7/Integrated Graphics), Black : Amazon.in: Computers & Accessories