The other guy is right. If you want longevity you need more vram. There is a reason why gtx 1080ti lasted so long with its 11gb vram. You want 16gb vram MINIMUM. 12gb is okay. But for sure, you want more than 8gb. Im also talking about 1080p gaming. 2k and 4k.. you definitely dont want less than 16gb.

Forgot to add. If you getting a 4070, make sure its gddr6x if possible. Nvidia being nvidia is releasing a gddr6 version and selling it for about the same price. No benchmarks yet.. but its slower memory. Maybe impact performance by 2 or 3 percent.