Can You Install Graphics Card in Lenovo ThinkStation P340 Tower?

The 2020 Lenovo ThinkStation P340 Tower supports the following discrete graphics cards:

• P400 - 2GB GDDR5 
  30W, 3 x miniDP 1.4.
• P620 - 2GB GDDR5
  40W, 4 x miniDP 1.4.
• P1000 - 4GB GDDR5
  50W, 4 x miniDP 1.4.
• P2200 - 5GB GDDR5
  75W, 4 x DP 1.4.

• 4000 - 8GB GDDR6
  160W, 3 x DP 1.4, 1 x VirtualLink.
• 5000 - 16GB GDDR6
  265W, 3 x DP 1.4, 1 x VirtualLink.

Here are the slots that available on the mainboard:

• 1 x PCIe 3.0 x16
  full height, full length, links to CPU.
• 1 x PCIe 3.0 x16
  x4 lanes, full height, full length, links to PCH.
• 1 x PCIe 3.0 x1
  full height, full length, links to PCH.
• 1 x M.2 2230 slot
  For WiFi and Bluetooth combo card.
• 2 x M.2 2230/2280 slots
  Onboard slots, For PCIe solid-state drive.
• 2 x M.2 2230/2280 slots
  Single M.2 to PCIe adapter, For PCIe solid-state drive.

Some graphics cards might need a powerful power supply, here are the power supply that might came with your PC:

• 300W
  80+ Gold 90% Efficiency 100 - 240V
• 500W
  80+ Platinum 92% Efficiency 100 - 240V