The original resolution textures are very big in size, someone mentioned the Buckingham palace alone is 20MB or so, add all the other buildings, ground textures, pilot models and so on and it gets huge pretty fast.
Also, the higher the resolution you run the more strain on your GPU.
If you want to run max texture resolution at 30" resolutions i expect that there's probably no GPU under 2GB that would take it, regardless of optimizations. Unless some kind of texture compression comes into effect, which would probably mean a lower vRAM usage but the need to do compression/decompression calculations that might affect the frame rates.
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