On Mon, Sep 4, 2017 at 3:56 PM, Nicolai Hähnle <nhaeh...@gmail.com> wrote: > On 04.09.2017 15:38, Aaron Watry wrote: >> >> On Sun, Sep 3, 2017 at 3:20 PM, David Niklas <do...@mail.com> wrote: >>> >>> Hello, >>> I'm interested in knowing why there are two different OpenCL >>> implementations of OpenCL drivers for AMD cards. >>> Is it because they support different ASICs? >>> One is older and going to be replaced? >> >> >> As near as I can tell, ROCm requires PCIe 3.0 Atomic operations for >> both the CPU and GPU. As such, ROCm will never support the VLIW >> radeons (5000-6000 series) or the earlier generations of GCN (SI, CI, >> possibly VI?). According to the ROCm page, it requires >> Fiji/Polaris/Vega. It also requires either a Haswell or Ryzen CPU (or >> newer), so anyone with an older CPU will be left out of ROCm support. >> External GPUs via Thunderbolt 1/2 enclosures are also unsupported. > > > For what it's worth, if you have an "older" system without PCIe 3.0 atomics, > you could still try and see how far you get with ROCm. As long as you don't > *actually* need atomics between the CPU and GPU in your own code, you're > probably fine. I've never tried it, though.
I can confirm with 100% certainty that PCIe 3.0 atomics aren't required if you don't need them. In the majority cases, you don't need them. Marek _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev
