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Intel now deactivates AVX-512 capability on new Alder Lake CPUs
And that would be fused on a hardware level. Whilst AVX-512 was not officially supported on the chips, it was useable on Alder Lake on several motherboards.
According to an unnamed source, AVX-512 has been fully disabled in recent editions of Intel's Alder Lake non-K CPUs. This was later confirmed by Intel. "While AVX-512 was not fuse-disabled on select early Alder Lake desktop devices," a company official informed Tom's Hardware, "Intel expects to do so on Alder Lake products in the future."
Most 600-series motherboards later received an upgrade that eliminated official support for AVX512. Surprisingly, several firms attempted to provide partial support via secret BIOS settings. However, this is expected to change shortly, since the revised Alder Lake silicon will no longer have this area of the device physically activated. If you want AVX-512 capability with Intel's latest designs, you'll have to upgrade to its more costly Xeon CPUs. Meanwhile, AMD is said to be adding AVX-512 support to its Zen 4 processors, which is an unusual twist if Intel continues to refuse to support the instructions on consumer devices.
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Kaarme
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Joined: 2013-03-10
Senior Member
Posts: 3310
Joined: 2013-03-10
#5997791 Posted on: 03/03/2022 05:29 PM
Intel reportedly dreams of a CPU ecosystem where they can sell only a few models of CPUs to every customer, and the customer then pays separately to activate different technological options in the CPU they bought, above the very basic, default limit. Your stance is on that side. Traditionally people like to think that they own what they carry home from the shop. Even if Intel didn't advertise a feature, like AVX-512, the chip did have it and it was possible to use it, even if it required some conditions (disabling efficiency cores). So, it was what the customer bought. From this point of view (or stance), it's a dubious move to remove the option afterwards.
You are right that it's not really comparable to a car's turbo charger because the turbo would naturally be used during every drive. Maybe it would be more comparable to a collision alert system that wasn't turned on initially, nor mentioned anywhere in ads or brochures, but by digging through the touch screen menus, a driver could turn it on and it would work more or less as expected. Then, when the car got a software update, it would disappear entirely. I imagine people who did turn it on and kept it on happily would be less than pleased by the update.
They never sold you AVX-512. It was never part of their marketing or specification. You only knew about it because some people poked around in it. Therefor, they have no obligation to keep it or give it to you.
Intel reportedly dreams of a CPU ecosystem where they can sell only a few models of CPUs to every customer, and the customer then pays separately to activate different technological options in the CPU they bought, above the very basic, default limit. Your stance is on that side. Traditionally people like to think that they own what they carry home from the shop. Even if Intel didn't advertise a feature, like AVX-512, the chip did have it and it was possible to use it, even if it required some conditions (disabling efficiency cores). So, it was what the customer bought. From this point of view (or stance), it's a dubious move to remove the option afterwards.
You are right that it's not really comparable to a car's turbo charger because the turbo would naturally be used during every drive. Maybe it would be more comparable to a collision alert system that wasn't turned on initially, nor mentioned anywhere in ads or brochures, but by digging through the touch screen menus, a driver could turn it on and it would work more or less as expected. Then, when the car got a software update, it would disappear entirely. I imagine people who did turn it on and kept it on happily would be less than pleased by the update.
anticupidon
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Joined: 2008-03-06
Senior Member
Posts: 7070
Joined: 2008-03-06
#5997793 Posted on: 03/03/2022 05:38 PM
Lemme get this clear.
The featured is present in the silicon, at hardware level.
But they choose not to enable it by some microcode alteration?
Have I got this clear?
Lemme get this clear.
The featured is present in the silicon, at hardware level.
But they choose not to enable it by some microcode alteration?
Have I got this clear?
schmidtbag
Senior Member
Posts: 7166
Joined: 2012-11-10
Senior Member
Posts: 7166
Joined: 2012-11-10
#5997798 Posted on: 03/03/2022 05:52 PM
Lemme get this clear.
The featured is present in the silicon, at hardware level.
But they choose not to enable it by some microcode alteration?
Have I got this clear?
I don't think it's even microcode. I think it's just BIOS.
Lemme get this clear.
The featured is present in the silicon, at hardware level.
But they choose not to enable it by some microcode alteration?
Have I got this clear?
I don't think it's even microcode. I think it's just BIOS.
nizzen
Senior Member
Posts: 2277
Joined: 2005-08-05
Senior Member
Posts: 2277
Joined: 2005-08-05
#5997802 Posted on: 03/03/2022 06:05 PM
must be Microcode, because we just inject the old cpu microcode to get avx 512 working in new bioses
I don't think it's even microcode. I think it's just BIOS.
must be Microcode, because we just inject the old cpu microcode to get avx 512 working in new bioses
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Joined: 2015-05-19
They never sold you AVX-512. It was never part of their marketing or specification. You only knew about it because some people poked around in it. Therefor, they have no obligation to keep it or give it to you.