I doubt it. The latest GPUs utilize HBM which is necessarily part of the same package as the main die. If you had a RAM slot for a GPU you might as well just go out to system RAM, way too much latency to be useful.
It isn't the latency which is the problem, it's the bandwidth. A memory socket with that much bandwidth would need a lot of pins. In principle you could just have more memory slots where each slot has its own channel. 16 channels of DDR5-8000 would have more bandwidth than the RTX 4090. But an ordinary desktop board with 16 memory channels is probably not happening. You could plausibly see that on servers however.
What's more likely is hybrid systems. Your basic desktop CPU gets e.g. 8GB of HBM, but then also has 16GB of DRAM in slots. Another CPU/APU model that fits into the same socket has 32GB of HBM (and so costs more), which you could then combine with 128GB of DRAM. Or none, by leaving the slots empty, if you want entirely HBM. A server or HEDT CPU might have 256GB of HBM and support 4TB of DRAM.
