Krteq píše:Co vlastně přinese GCN "1.3"
8x ACE
GPU v Carrizo je stejné jako u Tonga, je to v postatě stále VI (Volcanic Islands) doplněné o některé feature PI.
There are two main parts of Carrizo, the CPU and GPU, both of which are fairly well-known quantities at this point. The CPU is the first public appearance of the Excavator core while the GPUs are the familiar Volcanic Islands/VI generation. All of this is tied together by an HSA1.0 compatible fabric.
Moving on to the GPU front things are a bit less interesting. The shaders are VI generation with 8-cores aka 512 shaders backed by eight ACEs for compute and HSA functions. At a high level, the GPU isn’t very interesting mainly because the architecture has been released as a discrete part years ago.
What this means is that Carrizo is now fully HSA1.0 compatible so you can do all the tricks laid out years ago, we are finally there. The main new addition is GPU preemption, it is now a full citizen of the compute world, not just for graphics anymore. This also includes coherence, context switching, preemption on 3D workloads, QoS, and snooping. If you are wondering why GPU compute can fully context switch while graphics is stuck with preemption, it is a resource issue. Compute needs far less to switch and graphics doesn’t really make sense to swap like that, just let the pipe flush out and call it done. The GPU now has full access to the memory controller with all the advantages that brings, the eight ACEs can almost be considered CPU cores now.
čili Carrizo GPU je spíš stále "GCN 1.2"
To asi nebude žádný pokrok v cena/výkon poměru.
