True, but if you don't program for it, you get a hit on the extra cache about 60% of the time. I'll take 50% more bandwidth all the time over that. Also, it doesn't scale well to higher resolutions because it improves performance by using data for multiple frames. So, as I understand it (and it seems to show in benchmarks), you get a nice boost when you're at higher FPS, i.e. lower resolutions, but it levels off as you get to higher resolutions and lower FPS (less frames able to share data from the L2 cache). My issue here is I'm not buying a 3070+ or 6800+ class GPU to play anything under 1440p personally. Now a 4080 Ti with a 384 bit memory bus plus some short of L2 cache, and 16GB+ VRAM is pretty exciting to me and I think would be a good 5+ year gaming card; might even be worthy of 1080 Ti type longevity comparisons later down the line.
Perfect example of the infinity cache helping AMD 6800 keep up with a nVidia 3080 at lower resolution, then get absolutely trounced as the resolution scales up.
Relatedly, the 3070 with the same 256 bit bandwidth, is essentially neck and neck with the 6800 by the time you get to 4k resolution. Neither one of them has the bandwidth to really perform at that resolution. I think having 50% more memory bandwidth is why the 1080 Ti aged better than the regular 1080 as well; more resources are always more after all.
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I think your example is flawed.
The rx6800 was designed to compete with the rtx3070, and on your charts it does that very well. Beating it on every test.
A better comparison would be the rx6800xt vs the rtx3080, which is more interesting:
GeForce RTX 3080 vs. Radeon RX 6800 XT
Still among the best GPUs you can buy, let's take an updated look at the battle between the GeForce RTX 3080 and the Radeon RX 6800 XT...
Same cache as the rx6800, same memory bandwidth of the rx6800, but it keeps up with the rtx3080 much more closely. There is more going on then just cache and memory bandwidth.
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I think you need to rewind your perspective on the whole subject. It is all trade offs.
Memory Bandwidth: each memory line uses a lot of space on the chip. The contact pad, the power circuitry, noise control. Memory bandwidth is expensive, power hungry, and manufacturing defects are more harmful.
Cache: uses lots of space on the chip. However, power efficient, and defects can be planned for and do not ruin the entire cache. However, if a chip does not have enough memory bandwidth to start with, all the cache in the world is not going to do much.
At a certain threshold, different for each rendering resolution, adding more cache is more effective then adding more memory bandwidth. Yes, that threshold is lower for 1080p then it is for 4k, but it is still true at 4k. It is a balancing act. Add in computation assets, clock speed, etc, and it is never going to be a simple question of memory bandwidth vs cache.
AMD this generation went for more cache, and it worked for them. Nvidia went for more bandwidth, and it worked for them.
To claim that cache does not work at 4k is incorrect however, as AMDs has cache heavy designs with 256 memory busses that do work very well at 4k. The rx6800xt is within 5% of the rtx3080 at 4k, while only having 67% of the memory bandwidth* of the rtx and 78% of the wattage**.
*512 / 760.3 GB/s
**250 watts / 320 watts
As we move forward, with rtx4000 series already rumored to break power supplies, I suspect you will see nvidia beginning to move toward cache heavy designs also. Power consumption is going to begin to matter.
Let's see what can run 5120x1440 @ 200+ fps.
Just get an Intel Arc instead. Will save you a lot of money
Performance will determine price. If its higher, they will also milk it accordingly, to even above the 4090 (if they also get close to NV RT performance).
I'll just state it outright. If Nvidia thinks they're going to be able to charge prices higher or probably even equal for the next generation, they're smoking some serious stuff. All indicators are pointing to an economic decline. Important to note is that this is happening in addition to the potential avalanche of used mining cards, which will only add to the downward pricing pressure. What they want and what they'll get are going to be very different.
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