Both are Nvidia supplied information.
Nvidia Ampere Discussion [2020-05-14]
- Thread starter Man from Atlantis
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I made the move to GFE right after registering for a GOG account and have not looked back. I think if you want to take full advantage of features using tensor/rt cores (gamers or professionals) then it will become necessary.
Maybe but what would be the point of that.
DegustatoR
Veteran
Most of those which give an option between a simpler and more complex shading workload.
I've already mentioned TS vs TSE.
RT results are similar albeit it's harder to decouple RT improvements from flops gains there.
I think that people don't fully understand that Ampere is mostly limited by other stuff besides math atm. And it will likely increase it's performance advantage over Turing over time as more next gen games (even without RT) will come to market.
To demonstrate progress? If the 1080 was twice as fast as per your suggestion, it would be as fast as RTX 3080 in that example.
Nvidia hasn't said anything yet about why they went so hard on flops. It's certainly not guaranteed to pay dividends in the future. SVOGI is getting some attention but I don't know if that's even compute bound. There's also a lot of focus on high quality asset streaming but that's likely to be rasterization bound anyway. Not sure where all these flops will prove beneficial.
But there is no progress to demonstrate so the slide is misleading at best. A Pascal SM retired 256 FP32 flops per clock and INT32 had to compete for instruction slots, same as Ampere.
DegustatoR
Veteran
Well, RTX I/O is flops, for one.
Jawed
Legend
I think you should post specifics so that we can have a discussion about your theory.
So "fine wine"?
They're demonstrating the architectural improvement irrespective of unit counts.
Ampere can issue FP and INT simultaneously just like Turing and unlike Pascal. The difference is in the ratios which in Ampere represent a more realistic real world ratio. This test demonstrates that. Pascal would always come out behind, but if the test featured a more unrealistic 50/50 FP/INT split then Turing would have equaled Ampere in this unit count agnostic test.
An SM is just a measure of control per compute. Or do you think, all generations after Kepler with its 192 FP32 ALUs per SM are a regression?
DegustatoR
Veteran
Specifics are coming in a week from now.
Kinda similar. GCN's "fine wine" was partially due to an excessive compute performance of earlier generations too.
SMs can issue 4 warps per clock, warp is 32 threads. There are 4 fp32 SIMDs that are 16 wide and 4 fp32+int32 SIMDs that are also 16 wide. Issuing a warp to SIMD will take 2 clocks to consume. So other combinations are possible if warps are available.
And this is why the picture is wrong. Looking at a single unit (i.e. SM) Pascal has the same instruction throughput as Ampere for mixed INT and FP loads. Ampere wins because it has more SMs total.
And Pascal's units are twice as wide so it's a wash.
No, there's no scenario under which a Pascal SM has lower ALU throughput than an Ampere SM.
Geekbench 5 numbers from the 3080: https://browser.geekbench.com/v5/compute/1456542
I don't think the chart was supposed to represent an SM, rather it's just normalised ALU throughput.
Seems about right. I'm super curious about overclocking. Overclocking will speed up the rops, the raster engines, the texture units, but I would assume in an OpenCL test those wouldn't be the bottleneck. That means the gpu most likely doesn't have enough bandwidth in all situations for the number of cuda cores, or is there something else in the front-end that could explain it? Is it possible this test is mixing int32, but in an unequal ratio to fp32, like a 2:1 split for fp32 to int32?