I don't quite get it. What's so special about having 32MB of cache? Why is it called "infinity"?
The summary is that it's a cache attached to the memory controllers, rather than the CPUs, so it doesn't have to worry about cache coherency so much. This could be useful for shared memory parallelism.
Because it is last level before the actual ram chips, no coherency involved.
The main advantage of a memory attached cache is that it's cheaper than a regular cache, and can even be put on a seperate die, allowing you to have much more of it.
AMDs previous memory fabric from the early 2000s was called "Hyper Transport", which has a confusing overlap with Intel's Hyper Threading, but I think AMD actually bet intel to the name by a few years.
I think AMD might be ditching it for the next gen in exchange for growing the L2's, because the lower latency is beneficial to ray tracing.
[0]: https://substackcdn.com/image/fetch/$s_!LHJo!,f_auto,q_auto:...
Keep in mind that the 'big' desktop chips have bigger caches too. The L2 on a 5080 and 'L3' on a 9070 XT are both 64 MB. Additionally, AMD has already been growing the L2, going to 8 MB on the 9070 XT vs. 4 MB on the 7800 XT and 6800 XT.
Their marketing materials to OEMs have been leaked, and they no longer mention IC at all, instead proudly displaying (much higher) L2 amounts per GPU. This of course doesn't necessarily mean that they are definitely removing it, but it certainly hints at that.
Also, Ross Technology beat them both to "hyper" names with the hyperSPARC CPU.
The Super Mushroom power-up.
+1 insightful.