Desktop GPUs could have 64GB of GDDR right now but the memory bus width to drive those bits optimally (in primary use case of real-time game rendering, not offl

Desktop GPUs could have 64GB of GDDR right now but the memory bus width to drive those bits optimally (in primary use case of real-time game rendering, not offline) would up the power and heat dissipation requirements beyond what is currently engineered onto a [desktop] PCIE card. If 8k gaming becomes a real thing you can expect work to be done towards a solution, but until then not so much. Edit: added [desktop] preceding PCIE