Intel Nukes AVX-512 Support

[LiaoMi]

Hi  ,

Intel kills Alder Lake AVX-512 support for good - https://www.pcgamer.com/intel-kills-alder-lake-avx-512-support-for-good/
Intel Nukes Alder Lake's AVX-512 Support, Now Fuses It Off in Silicon - https://www.tomshardware.com/news/intel-nukes-alder-lake-avx-512-now-fuses-it-off-in-silicon

Scharfe Kritik an Intel AVX 512 - https://www.zdnet.de/88381431/scharfe-kritik-an-intel-avx-512/
Der Befehlssatz Intel Advanced Vector Extensions 512 (Intel AVX-512) hat offenbar Probleme. Linux-Urgestein Linus Torvalds wünscht ihm sogar ,,einen schmerzhaften Tod."
Linus Torvalds: "I Hope AVX512 Dies A Painful Death" - https://www.phoronix.com/news/Linus-Torvalds-On-AVX-512

Intel is reportedly disabling AVX-512 instruction set on Alder Lake CPUs - https://www.techspot.com/news/92830-intel-reportedly-disabling-avx-512-instruction-set-alder.html

I've no idea what good is this avx512 for, what type of apps use this instruction set?
Software that want to calculate heavy parallel calculations, especially FPU ones, with low latency. Very much simplified, AVX units on CPU do much same as modern GPUs do (parallel workloads) but since AVX units are inside CPU they have very low latency. GPU calculations needs to be feeded via PCIe bus that is quite slow.

Main problem with heavy AVX use is ultra high power consumption. Also consumer software rarely have much use for AVX instructions.

On the dangers of Intel's frequency scaling - https://blog.cloudflare.com/on-the-dangers-of-intels-frequency-scaling/

What do you think about it?

I'm still the proud owner of the Intel Core i7-1165G7 mobile versions that support this set 

[Gunther]

What do you think about it?

I'm still the proud owner of the Intel Core i7-1165G7 mobile versions that support this set 

If your CPU has this instruction set, you should use it. Linus Thorvald's comment is already old - from the year 2020. By the way: My CPU also supports AVX-512 F,
AVX-512 DQ, AVX-512 CD, AVX-512 BW and AVX-512 VL. 

[Biterider]

Hi
It's a very strange move by Intel that definitely damages its reputation in the market.
Because it's done compulsively, I'm sticking to the idea that there are technical difficulties behind it, not a marketing decision.

A hot situation will arise when AMD releases the AMD Ryzen 7000 extension in autumn 2022 https://www.tomshardware.com/news/amd-ryzen-7000-zen4-avx512.

Biterider

[hutch--]

This is why I am in no rush to update any of my hardware that already handles AVX AVX2. Some of the high end later Intel CPUs are very fast on a couple of cores but running natively at 90c or higher is not a viable option for large scale processing of video or similar.

I have stayed with Xeon version 3 hardware because you can thrash the guts out of it with 12 or 14 cores running at 2.9 to 3.0 gig for hours where it does not top 50c (with decent cooling). The old i7 I develop with run a bit hotter, 60 - 65c clocked at 4 gig.

There are later Xeon Platinums that really have the multi-core grunt but even on the second hand market they are expensive and the boards are very hard to get and at very high cost.

[LiaoMi]

Hi
It's a very strange move by Intel that definitely damages its reputation in the market.
Because it's done compulsively, I'm sticking to the idea that there are technical difficulties behind it, not a marketing decision.

A hot situation will arise when AMD releases the AMD Ryzen 7000 extension in autumn 2022 https://www.tomshardware.com/news/amd-ryzen-7000-zen4-avx512.

Biterider

Hi Biterider,

they disabled instruction support first through the bios, now they will disable this instruction set physically, this goes against their new dual processor strategy as for some reason they can't work together, some kind of power issue. But from the past, this is not the first time they have refused to introduce this instruction set into a new line of processors. In addition, they recently introduced a new marketing strategy. Which says that the processors will be distributed by subscription. This means that in order to activate some functionality, you will have to pay extra 

This is why I am in no rush to update any of my hardware that already handles AVX AVX2. Some of the high end later Intel CPUs are very fast on a couple of cores but running natively at 90c or higher is not a viable option for large scale processing of video or similar.

I have stayed with Xeon version 3 hardware because you can thrash the guts out of it with 12 or 14 cores running at 2.9 to 3.0 gig for hours where it does not top 50c (with decent cooling). The old i7 I develop with run a bit hotter, 60 - 65c clocked at 4 gig.

There are later Xeon Platinums that really have the multi-core grunt but even on the second hand market they are expensive and the boards are very hard to get and at very high cost.

Hi Hutch,

I expected this to be the case. Therefore, I purchased the 11th generation of processors for home use. I sold my last 10th generation processor. I currently have two Intel Xeon Platinum 8176 Processors, I bought two QS versions - https://ark.intel.com/content/www/de/de/ark/products/120508/intel-xeon-platinum-8176-processor-38-5m-cache-2-10-ghz.html, 250 euros for each + https://www.ebay.de/itm/294976970878. The second generation is already more expensive. As usual, prices will drop soon. And the motherboard can be used from the first generation 

What do you think about it?

I'm still the proud owner of the Intel Core i7-1165G7 mobile versions that support this set 

If your CPU has this instruction set, you should use it. Linus Thorvald's comment is already old - from the year 2020. By the way: My CPU also supports AVX-512 F,
AVX-512 DQ, AVX-512 CD, AVX-512 BW and AVX-512 VL.

Hi Gunther,

it seems to me that these instructions are not so rare in the field of video and audio processing. In any case, it would be interesting to study the effect of AVX512 instruction set on the frequency drop and the impact on the overall performance of the system.

P.S. Instruction set detection didn't work on my 11th generation processor.

[Gunther]

P.S. Instruction set detection didn't work on my 11th generation processor.

I've already answered you about this in another thread.