The Lenovo IdeaCentre 5i Desktop model number 90NA0000US, ships with integrated graphics processing with in the Intel Core i3-10100 processor. It is the integrated, Intel UHD Graphics 630 version. There is an internal 260W power supply within this configuration, with no open bays or PCIe slots for expansion to a discrete graphics card.

Yes it can. You can purchase the Windows 10 Pro 64-bit Operating System upgrade and install it on this Lenovo IdeaCentre A340-22 All-in-One system, model number F0EA003RUS.

The Lenovo Legion Slim 7 15 model number 82K80001US, uses 2x USB-C 3.2 Gen 2 (support data transfer, Power Delivery 100w and DisplayPort 1.4) for video out capability, attached to the NVIDIA GeForce RTX 3060 GPU with 6GB GDDR6 VRAM, Boost Clock 1282 / 1425MHz, TGP 100W.
With a maximum data rate of 25.92 Gbps, DisplayPort 1.4 can handle 4K resolution 24-bit color at 98 Hz, and dropping to 4:2:2 YCbCr gets it to 144 Hz with HDR. Actual performance will depend on the connectivity of the specific monitor you use. We recommend you check with your monitor manufacturer for the requirements and specifications for maximum performance.

That really will depend on the requirements and compatibility of the specific games you want to play. The Lenovo IdeaPad 3 15 laptop, model number 81WR000FUS, ships with Windows 10 S-Mode 64-bit Operating System. Windows 10 S-Mode provides added security by only allowing APPs available ( and therefore certified by Microsoft) at the Microsoft Store. If you don't need the added security or you need to install APPs not available at the Microsoft Store, you can switch to standard Windows 10 Home 64-bit Operating System, at no additional cost. We recommend you check with the specific game's software publisher's web sites, of the games you want to play, for their compatibility with Windows 10 S-Mode 64-bit operating system and the minimum/recommended hardware requirements (Is a Graphics card required, the processor speed and the minimum required system RAM and the minimum available hard drive space) to run their program, then compare those requirements to this system's configuration. If you choose to switch out of S-Mode for Windows 10 Home, here is a link to instructions for switching from Windows 10 S-Mode to Windows 10 Home: https://support.microsoft.com/en-us/help/4456067/windows-10-switch-out-of-s-mode