I've old Intel Core i7 3820 (Sandy Bridge) which isn't supported by ROCm and I can't decide now: to bye or not to bye this graphics card (new AMD Radeon)
do you want play ROCm? if yes: Buy Radeon RX 580! (Polaris 10)
OpenCL 1.2 is currently available for Radeon RX 580 through opensource and proprietary AMD drivers, then you don't need ROCm to run OpenCL apps.
About OpenCL 2.0 under GNU/Linux i advice you read Ubuntu 16.04 OpenCL 2.0 support
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