[Kon5ole]

>But this is not what I as a consumer end up seeing at all. Consider the RTX 5090. Gen-on-gen (so, compared to the 4090), for 20-30% more money, using 20-30% more power, you get 20-30% more raster performance. Meaning the generational improvement is 0, software nonwithstanding.

The 4090 and 5090 are the same generation in reality, using the same process node. The 5090 is a bit larger but only has about 20% more transistors of the same type compared to the 4090. Which of course explains the modest performance boosts.

Nvidia could have made the 5090 on a more advanced node but they are in a market position where they can keep making the best products on an older (cheaper) node this time.

>Why would you bring absolute values into comparison with a relative value? Why compare the 286 and the P3 and span 20 years when you can match the 2 year timespan of your Ryzen comparison, and pit the P2 ('97) against the P3 ('99) instead? Mind you, that would reveal a generational improvement of 7.5M -> 28M transistors, a relative difference of +273%!

That was my point though, to highlight how relative differences in percentages represent vastly different actual performance jumps. It quickly becomes meaningless since it's not the percentages that matter, it is the actual number of transistors.

To put it another way - If you take the first pentium with about 3 million transistors as a baseline, you can express performance increases in "how many pentiums are we adding" instead of using percentages, and note that we are adding orders of magnitude more "pentiums of performance" per generation now than we did 10 years ago.

[short_sells_poo]

You seem to be completely confused about why absolute vs relative matters. Moore's law literally states: "[Moore's law] is the observation that the number of transistors in an integrated circuit (IC) doubles about every two years".

This is literally a relative measurement. You cannot reason about Moore's Law in absolute changes.

The other poster has laid it out for you in the simplest terms: a 1 billion transistor increase could mean anything. It could be a 1000% improvement - which is absolutely humongous - or a 10% improvement, which is basically irrelevant. If you want to measure how impactful an increase is, you have to look at relative change. 1 billion transistors on it's own means nothing. It is only interesting with respect to the number of transistors in the previous generation - which is a relative change measurement.

Say we are at Generation 1 with 100 billion transistors. By your reasoning, if we add 1 more billion of transistors to this, that's big. 1 billion transistors are a lot. But this is absolutely incorrect! Because we started out with 100 billion transistors, the change is actually irrelevant.

[Kon5ole]

>You seem to be completely confused about why absolute vs relative matters.

[..]

>This is literally a relative measurement. You cannot reason about Moore's Law in absolute changes.

This is exactly my point. I said exactly the same thing as you: "I think Moore’s law should be avoided altogether when discussing progress in this area"!

Performance is an absolute thing, not a relative thing. Amount of work per second, not percentage-over-previous!

Doubling means that each step encompasses the sum of all previous steps. Every step gives vastly more performance than any preceding step.

If a generation gives 60% more performance and all previous generations gave 100%, the latest jump will still be the one that added the most performance.

I think this is often overlooked and worth mentioning. People are actually complaining about performance jumps that are the biggest performance jumps ever seen because they are thinking in percentages. It makes no sense.

[short_sells_poo]

I disagree on this: "Performance is an absolute thing"

I think the core misunderstanding is what is being discussed. You say "Performance is an absolute thing, not a relative thing. Amount of work per second, not percentage-over-previous!"

But nobody here is concerned with the absolute performance number. Absolute performance is only about what we can do right now with what we have. The discussion is about the performance improvements and how they evolve over time.

Performance improvements are inherently a relative metric. The entire industry, society and economy - everything is built on geometric growth expectations. You cannot then go back to the root metric and say "ah but what really matters is that we can now do X TFlops more", when that number is a mere 10% improvement, nobody will care.

Built into everything around computing is the potential for geometric growth. Startups, AI, video games - it's all predicated on the expectation that our capabilities will grow in geometric fashion. The only way to benchmark geometric growth is by using % improvements. Again, it is wholly irrelevant to everyone that the 5090 can do 20 tflops more than the 4090. 20 TFlops is some number, but whether it is a big improvement or not - ie is it expanding our capabilities at the expected geometric rate or not - is not possible to divine from this number.

And when we look it up, it turns up that we went from 80 tflops to 100 tflops, which is a paltry 25% increase, well short of the expectations of performance growth from Nvidia which was in the 50% region.

20 tflops might or might not be a lot. The only way to judge is to compare how much of an improvement it is relative to what we could have before.

[Kon5ole]

>I think the core misunderstanding is what is being discussed.

I see your point and it's valid for sure, and certainly the prevailing one, but I think it's worth thinking about the absolute values from time to time even in this context.

In other contexts it's more obvious, let's use video. Going from full HD to 4K is roughly a doubling of resolution in each direction. It means going from about 2 megapixels to 8, a difference of 6.

The next step up is 8k, which is going from 8 megapixels to 33. A difference of 25.

This is a huge jump, and crosses a relevant threshold - many cameras can't even capture 33mpx, and many projectors can't display them.

If you want to capture 8k video, it's not relevant if your camera has twice the megapixel count of the previous one - it needs to have 33mpx. If it has 16 instead of 8 it doesn't matter (also it doesn't really matter if it has 100 instead of 40).

On the other hand, if you want to capture 4k, you need only 8 megapixels. If you have 12, 16 24 or 40 doesn't really matter.

If we return to CPUs, absolute performance matters there too - if you want to play back video without frame drops, you need a certain absolute performance. If your computer is twice as fast and still can't do it, the doubling didn't matter. Similarly if your current computer can do it, doubling it again won't be noticeable.

[perching_aix]

> That was my point though, to highlight how relative differences in percentages represent vastly different actual performance jumps. It quickly becomes meaningless since it's not the percentages that matter, it is the actual number of transistors.

But it is the percentage that matters? If I have 10B transistors and I add 1B to it, the speedup I can expect is 10%. If I have 1B transistors and add 1B to it, the speedup I can expect is 100%. Tremendous difference. Why would I ever care about the absolute number of transistors added?

[Kon5ole]

>But it is the percentage that matters? If I have 10B transistors and I add 1B to it, the speedup I can expect is 10%. If I have 1B transistors and add 1B to it, the speedup I can expect is 100%. Tremendous difference. Why would I ever care about the absolute number of transistors added?

Because it's the transistors that actually matter for performance.

If a unit of work (number of files compiled, number of triangles generated or whatever else) takes 1 billion transistors to complete in 1 second, you have gained the same amount of work per second by adding 10% to the latter as you gained by adding 100% to the former.

How much performance you need to feel a difference in a given workload is a separate point, and note that usually the workload changes with the hardware. Compiling the linux kernel in 2025 is a different workload than it was in 2005, for example, and running quake 3 is a different workload than cyberpunk 2077.

If you play a modern game, you don't notice a difference between a 10 year old GPU and a 12 year old GPU - even though one might be twice as fast, they might both be in the single digits of FPS wich feels equally useless.

So we gain more from the hardware than we used to, but since the software is doing more work we're not noticing it as much.

[perching_aix]

I legitimately just do not see the utility of framing the topic this way.

Benchmarking efforts usually involve taking the same amount or type of work, and comparing the runtime durations or throughputs in turn for different hardware.

Rasterization performance benchmarks for the 5090 revealed exactly the same +20% difference we see in transistor count. This is why I do not see the utility in remarking that in absolute terms we're adding more transistors than ever, because this is basically never what matters in practice. I have a set workload and I want it to go some amount faster.

Software sprawl is an issue no doubt, but that on its own is a separate discussion. It bears light relation with the absolute vs. relative differences discussion we're having here.

> How much performance you need to feel a difference in a given workload is a separate point

It was exactly the point I said at the start should be the point of focus. Maybe we're talking past one another, I don't know.

[Kon5ole]

>It was exactly the point I said at the start should be the point of focus. Maybe we're talking past one another, I don't know.

I think we do - we agree that the symptom is that we don't experience the same gains now as we used to, and that is a problem.

My issue is the notion that this is caused by a slowdown in performance gains from the hardware side, when this is clearly not the case. A common complaint is along the lines of "we only got 30% when last time we got 50%", which completely ignores that the latter 30% is way more actual new performance than the previous 50%.

>I legitimately just do not see the utility of framing the topic this way.

IMO it's always useful to identify the actual reason for a problem and think about the fundamentals.

If the problem is that we're not experiencing the performance gains, we should be asking ourselves "Why does software feel slower today despite the hardware having 10x more performance".

Instead we complain about the hardware for not managing to add the equivalent of all previous performance gains every 2 years, because Moore's law observed that it did so in the beginning of the chessboard (so to speak).

Instead of wondering whether Moore's law is dying or not, we should question why Wirth's law seems to be immortal! ;)