iGPU/APU メモリ共有。UMA(Unified Memory Architecture・CPU/GPU同一物理RAM)・BIOS設定 UMA Frame Buffer Size(Auto/512MB/1GB/2GB/4GB/8GB)・AMD Smart Access Memory・Intel iGPU Dynamic Allocation(legacy 64MB min・Pluton 4GB+)・Apple M series Shared Memory Pool(CPU+GPU+NPU統合・546GB/s M4 Ultra)・Strix Halo AMD 128GB unified・DDR5 speed影響大 iGPU(Radeon 780M DDR5-5600→6400で+10-15%)・2026年 Ryzen AI Max 40CU + 128GB UMA、Mac Studio M4 Ultra競合。