Just spotted an interesting difference under AmigaOS 4.1 between the Sam460ex and X5000/020 Memcopy performance with HD6550 and HD6570. DMA vs no DMA .


Sam460ex - HD6450

MemCopy Score: 603.20
Operation MiB/s
Copy to VRAM 301.07
Write Pixel Array 626.69
Copy from VRAM 57.86
Read Pixel Array 57.92


X5000/020 - HD6450

MemCopy Score: 308.74
Operation MiB/s
Copy to VRAM 270.00
Write Pixel Array 269.71
Copy from VRAM 40.21
Read Pixel Array 38.54

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With an R7-250x


Sam460ex - R7-250x

MemCopy Score: 602.57
Operation MiB/s
Copy to VRAM 305.42
Write Pixel Array 629.77
Copy from VRAM 53.19
Read Pixel Array 54.13

X5000/020 - R7-250x

MemCopy Score: 584.04
Operation MiB/s
Copy to VRAM 532.90
Write Pixel Array 530.81
Copy from VRAM 54.10
Read Pixel Array 52.25