Strix Halo offers the option to split memory to create a contiguous framebuffer for the iGPU for better performance (less data fragmentation), but iGPU can access the entire UMA region dynamically. So, in a 128GB system where 96GB is allocated, iGPU isn't locked out of the remaining 32GB - it's just dynamically managed between CPU and iGPU when large datasets are processed in RAM.
Once iGPU takes too much RAM, CPU processes spill into a pagefile, so there isn't a magic bullet for everything. You can allow the iGPU to use as much as needed via driver memory management, but that has other costs.
With the latest graphics driver update, the Intel Arc Pro B390 iGPU can use up to 93 percent of the available system memory as graphics memory. This is expected to boost performance by up to 15 percent in select workflows.
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