Just popping in 
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In my experience with SAM460LE, I'd use a R7 240 (Orland Chipset ) low profile but have some issues with Radeon HD driver 3.x, sometimes my system hold. When I'd update to Radeon HD v5 all works great and get better performance, tested with Warp3DNova and Novabridge working without issues. VideoDecoding hardware works great with 720p videos, HD videos need RadeonRX. In my experience if you have Radeon SI grfx card with Cape Verde chipset you can use RadeonHD 3.x without issues, but with other chipset like Orland, RadeonHD V5 works better, at least with SAM460LE.
Now I have an X5040, but when I'd use SAM460LE RadeonV5 driver for SAM not have GART enabled (RadeonHDv3 on SAM not support GART too), I don't know if today this feature is enabled. When this feature is enabled grfx card theoricaly works faster because enable caches for data transfers gfx card with SAM system. Other systems with PCIe support GART by default, its a limit only with SAM systems.
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