I've got a few TS140's. If you want to put a gaming GFX card in it, you'll need to replace the Lenovo power supply as it doesn't have additional connectors to power the card. You'll also need an additional adapter to convert the standard power supply to board connector - see post below.
Lenovo TS140 as ESXi and NAS box – with a twist! | JonKensy.com
Lenovo TS140 as ESXi and NAS box – with a twist! | JonKensy.com
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