AMD’s Infinity Cache, Introduced with RDNA 2, Infinity Cache is a new cache system that works in conjunction with the GDDR6 memory interface in both the RX 6800 XT and RX 6800. It’s a pretty big deal for AMD as well, with its engineers telling us that’s the key to unleashing it. For gaming performance from 1080p to 4K as it would have been saddled with a massive power-hungry alternative.
Infinity Cache sits on the side of the main set of computing cores inside AMD’s Navi 21 GPU, and basically acts as a small but efficient memory store. It’s sandwiched between smaller L1 and L2 caches, also on the GPU itself, and the widest GDDR6 and DDR4 memory off-chip, on the PCB and in the computer itself.
And why is this entirely new approach to graphics cache? I have been told that it all comes from the engineering team’s desire to avoid using an expensive and thirsty 512-bit memory bus. Presumably, this was what was otherwise required to keep Big Navi GPUs in touch with their Nvidia competitors. As it turns out, the RX 6800 XT and its younger sibling are often more than just a match for the RTX 3080 and RTX 3070 respectively, and the Infinity cache is a big reason for this.
For the record, all graphics cards from the RX 6000 series, including the upcoming RX 6900 XT, AMD’s Infinity Cache, come with the same memory configuration. 16 GB of GDDR6 and a 256-bit memory bus – which can be interpreted as a bit small for all of these memory chips. This is where the 128MB Infinity Cache on the chip comes in.
“So, we’re going to work on that. And in the future we’ll evaluate, you know, whether there are reasons to explore providing more clarity in the cache.”
Perhaps that will fuel the old adage of “good wine,” the notion that AMD graphics improve with age.
“But at the moment, you know, I think it’s a good thing to have them, and they provide benefits without a huge amount of work on the part of the developers to achieve those benefits.”
And these potential benefits will only come as a cake for AMD’s graphics team. Infinity Cache has already proven its worth, and as you can see in our reviews of the RX 6800 XT and RX 6800, these two graphics cards can stand on two legs well enough without being supported by the clever programming of each game.
Although, more performance from the RX 6800 XT will go a long way in its battle against the Nvidia RTX 3080 in 4K.
Source : pcgamer