GPUs & CPUs & Enthusiast hardware: Questions, Discussion and fanboy slap-fights - Nvidia & AMD & Intel - Separe but Equal. Intel rides in the back of the bus.

Aborted Drink Combo said:
What is AVX-512 even used for? Genuine question. Whenever I'm making fun of Intel 11th gen because it gets mogged by my 10850k I get people screeching about AVX-512.
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It's useful for stuff like video encoding and PS3 emulation.

The Ugly One said:
The PS3's CPU had more raw floating-point capacity than the PS4's CPU...except this is a pointless comparison because already by the time the PS3 came out, nearly all the stuff you used to need a lot of FP32 performance for had been moved to the GPU. The PS4's CPU had far more generic instruction throughput, which is what modern gaming needs. It's why removing AVX-512 had zero gaming impact for Alder Lake.
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Yeah that's kinda what I was getting at. It's such an obviously wrong statement and yet he's saying like that so confidently that it makes me feel like he doesn't really know anything.

IIRC I think he worked in automobiles before this?
 
Aborted Drink Combo said:
What is AVX-512 even used for? Genuine question. Whenever I'm making fun of Intel 11th gen because it gets mogged by my 10850k I get people screeching about AVX-512.
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Math on arrays. Add two giant blocks of numbers, multiply them, etc. AVX2 can do 8 FP32 ops per click cycle, AVX-512 can do 16.

It's not as big a boost as you think because an AVX-512 unit splits into two AVX2 units when processing AVX2 instructions. So for basic stuff like adding and multiplying, there is no real difference. AVX-512 has a richer instruction set that affects a marginal set of use cases...IIRC AVX2 doesn't have a vector scatter operation.

It's mainly used for scientific computing, rendering, encode/decode, stuff like that. Games do nearly all the math on the GPU now, including particles and physics, since it's been integrated into DX for a decade now.
 
Smaug's Smokey Hole 2 said:
Just curious, do you have any examples of physics being 100% done on the GPU that is then sent back and actually affecting the game without the CPU being involved in ways other than send data and receive data?
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Cloth dynamics, waving foliage, water waves. GPUs enable scaling of physics across the environment. CPUs just can't keep up.

idk what you mean by "actually affecting the game"
 
The Ugly One said:
Cloth dynamics, waving foliage, water waves. GPUs enable scaling of physics across the environment. CPUs just can't keep up.

idk what you mean by "actually affecting the game"
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Those are essentially post-processing effects. I asked if you had examples of things like that where it affected the state of the game without the CPU doing the actual physics calculations of forces, bounding boxes, collisions etc. Like where the GPU communicates back and changes the game state. It's not a gotcha, I'm curious.
 
GhastlyGhost said:
It's a 512bit width SIMD instruction set. You use it anywhere it makes sense to process a lot of numbers (roughly) the same way at the same time. Most useful for things like particles and physics in games.
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it's also a necessary requirement for PS3 emulation to not suck massive ass.
 
harbringer883 said:
So apparently AMD is relaunching the 7 5800x3D again for a "10 year anniversary" of AM4?
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if it comes with a "unique" cooler or styled shit that'd be great, although i still remember the special anniversary 2700x which was basically fucking nothing outside a gay sticker and a box... both the 5700XT and Radeon VII looked good though, wish shit like that was more common but alas gay beancounting doesn't let you...
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Fcret said:
Does anyone know what Moore's Law is Dead actually has a background in? Every video I've seen him of talking about shit, I get the impression that his knowledge of computer architecture seems... spurious.

EDIT: The comment that made me think about this again was this nugget from twitter -
View attachment 8858508

Like if you look at pure clockspeed and theoretical throughput, then yes you could argue that the PS3's CPU is better in certain scenarios. But it never actually worked like that in actual practice because the PS3 CPU lacked out-of-order execution and branch prediction which significantly hampered performance (hence why so many PS3 games got PS4 rereleases where you finally got a stable 30 fps).
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He has a background in Mech Eng according to his website
 
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