If it’s just card graphics, you may be able to go as low as 1024, maybe even 512 for texture sizes, 2k seems still even a little overkill for a card but that decision is yours to make. The smaller you can go whilst retaining desired visual quality id say go. Smaller sizes means less vram and less memory use across the board, allowing for smooth performance with more objects in play and more vfx like particles and post process without taxing frame rate
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