How much VRAM does a GPU need?
In 2021, 4 GB of dedicated VRAM should be the bare minimum to aim for in graphics cards. However, 8 GB is now the standard for most GPUs and that's what you should aim for if you want a future-proof graphics card and/or if you intend on getting a 1440p or 4K monitor.
Does GPU VRAM speed matter?
This means that having faster VRAM allows your graphics card to process these assets quicker, and having more VRAM allows for more assets to be stored. So, having a higher VRAM clock speed can help your games render much faster.
Is 4GB VRAM enough for 1080p?
See, VRAM isn't the Only Factor which Determine Performance of the GPU, and 4GB of VRAM is Enough to Game Most games at 1080p Resolution. See, VRAM isn't the Only Factor which Determine Performance of the GPU, and 4GB of VRAM is Enough to Game Most games at 1080p Resolution.
Will overclocking reduce GPU life?
The only thing overclocking would do to reduce lifespan of a component is the overclock producing higher heat. Nothing more, nothing less. However if you can keep the average temperature of the GPU the same as what it was expected to run at, there won't be a significant difference in life span.