In the case of multi-gpu gaming, loading might not be an issue.
You are sending the exact same data to both GPUs. If the the PCIe switch and GPU drivers support multicast, then you would actually get the full 16x bandwidth to both.
Which is actually a huge advantage over the most common multi-gpu setup, which is forced to statically split the 16 PCIe lanes into two independent 8x slots. Even if you were playing a game that only used one GPU, simply having the second gpu plugged in meant your total bandwidth to each gpu was limited to 8x speed.
I really wish you could find x86 motherboards with PCIe switch chips... but switch chips are really expensive so nobody makes them.
You are sending the exact same data to both GPUs. If the the PCIe switch and GPU drivers support multicast, then you would actually get the full 16x bandwidth to both.
Which is actually a huge advantage over the most common multi-gpu setup, which is forced to statically split the 16 PCIe lanes into two independent 8x slots. Even if you were playing a game that only used one GPU, simply having the second gpu plugged in meant your total bandwidth to each gpu was limited to 8x speed.
I really wish you could find x86 motherboards with PCIe switch chips... but switch chips are really expensive so nobody makes them.