It's not about profit, it's about power and pin budget. Proper GPU needs lots of memory bandwidth=lots of memory-dedicated pins (HBM kinda solves this, but has

It's not about profit, it's about power and pin budget. Proper GPU needs lots of memory bandwidth=lots of memory-dedicated pins (HBM kinda solves this, but has tons of other issues). And on power/thermal side having two chips each with dedicated power circuits, heatsinks and radiators is always better then one. The only reason NOT to have to chips is either space (that's why we have integrated graphics and it sucks performance-wise), packaging costs (not really a concern for consumer GPU/CPU where we are now) or interconnect costs (but for both gaming and compute CPU-GPU bandwith is negligible compared to GPU-RAM).