Citiraj:
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It is typical today for a discrete graphics processing unit (GPU) to have only a small portion of its frame buffer exposed over the PCI bus. For compatibility with 32 bit OSes, discrete GPUs typically claim a 256 MB I/O region for their frame buffers and this is how typical firmware configures them.
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Famozni Resizable BAR koji je po defoltu 256MB:
https://docs.microsoft.com/en-us/win...le-bar-support
Generalno, na isti problem bi naletio s 4GB RAM-a + 2GB VRAM-a, ako je do ukupne količine memorije. Ali čini se da nije.
Postoji još limit od 2GB virtualne memorija po aplikaciji. Možda i to na neki način igra ulogu.