Minimum System Requirements

Roblox states the Minimum System Requirements for most people will be: This chart has not been updated since 2009, but thanks to some dedicated hardware collectors, we were able to establish a new chart of minimum requirements. If a PC was made after 2011, you should be good in the specs department. Internet is the biggest department where lag can occur.
 * Graphics Card:  Roblox requires DirectX 9 minimum and Shader Model 2.0. For the best performance we recommend either a computer less than 5 years old with a dedicated video card, or a laptop less than 3 years old with an integrated video card.
 * Processor:  Roblox recommends you have a recent processor (2005+) with a clock speed of 1.6 Ghz or better. There have been some issues with older AMD processors.
 * RAM or Memory:  Roblox recommends you have at least 1 GB of memory on Windows Vista, Windows 7, Windows 8, or Windows 10
 * computers. At least 512 Mb of memory is recommended for Windows XP.
 * Storage Space:  Roblox recommends you have at least 20 Mb of system storage space to install Roblox
 * Graphics Card:  Minimally, you can get playable framerates with Intel HD Graphics 2000 or higher (onboard graphics), but just make sure you have at least 128MB of VRAM. Integrated graphics will have a much harder time with larger games such as Phantom Forces. For a much nicer experience, upgrading to a dedicated GPU such as a Geforce GT 740 would make heavier games, such as Phantom Forces, run smoother.
 * Processor: Any Dual Core CPU with a frequency of 2.7GHz or higher (EX: Pentium G3258 3.2 20th Anniversary Edition). Roblox will refuse to run on most Single Core CPU's
 * RAM or Memory:  2-3 GB of memory running in ANY environment, 4GB of RAM is highly advised though.
 * Storage Space:  700 Mb of system storage space to install Roblox. Since Roblox does tons of updates, 2GB of Disk Space is recommended for update flexibility.
 * Internet: 5 Megabits per second down and 1-2 Megabits up will be fine for Roblox, but games which need to stream a lot of assets will slow down a tad.

This PCPartPicker list is a PC based on the specs of our list, but better in some departments (Quad core CPU vs Dual Core) https://pcpartpicker.com/list/vLnLbj