Star Citizen has just updated its minimum system requirements and they appear rather easy-going: a quad-core CPU of unspecified age, a GPU with 4GB of VRAM, and 16GB of system memory. Many modern systems quite happily conform to that specification, especially with the developers noting a few examples of graphics cards that meet the requirement, including the GTX 1060, RX 460, and Arc A380.
That's the absolute bare minimum hardware required to run the game, as per the developers (via KitGuru). Though you probably won't get far even if you do meet them. Take a look at the Star Citizen subreddit and recent threads would suggest anyone with a similar specification PC may run into some performance issues. In a thread noting the need for updated system requirements, you'll find multiple mentions of how 32GB of speedy RAM is much more a requirement to enjoy the game with a modicum of performance than anything else.
The Star Citizen developers have addressed that with the updated recommended system requirements.
There's now a firmer recommendation for 32GB of DDR4—a qualified increase on the vague «16GB+» previously mentioned. There's also a requirement of a DirectX 12 compatible graphics card with 8GB VRAM and a slight refinement in the grade of AMD CPU required to run the game. Bulldozer has been replaced by Ryzen 5, which is a more modern processor, if nothing else.
The CPU requirement remains vague: Neither Intel or AMD CPU states a suitable generation, implying all are welcome, though that's not generally seen to be the case today. You do need a relatively modern CPU in order to run Star Citizen, among other things.
The developers now «strongly advise» the game be installed on an SSD. That's been the longstanding advice of experienced players, as the HDD performance is painfully slow.
Best CPU for gaming: The top chips from Intel and AMD.
Best gaming motherboard: The right boards.
Best graphics card: Your perfect pixel-pusher awaits.
Best SSD for gaming: Get into