What's AMD (Processors) up to? v2

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powerarmour
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Re: What's AMD (Processors) up to? v2

Post by powerarmour » Mon Jun 10, 2019 11:50 pm

Possibly the worst kept 'surprise' in tech for a while that! :P
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Re: What's AMD (Processors) up to? v2

Post by thegrommit » Tue Jun 11, 2019 12:19 am

powerarmour wrote:
Mon Jun 10, 2019 11:50 pm
Possibly the worst kept 'surprise' in tech for a while that! :P
Yeah, though I'll be interested to see how accurate the TDP is, or whether they've adopted the Intel approach.
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Re: What's AMD (Processors) up to? v2

Post by thegrommit » Tue Jun 11, 2019 6:25 pm

Microarchitecture details:

https://www.anandtech.com/print/14525/a ... -epyc-rome
...a good number of the recent array of side channel exploits do not affect AMD processors, primarily because of how AMD manages its TLB buffers that have always required additional security checks before most of this became an issue. Nonetheless, for the issues to which AMD is vulnerable, it has implemented a full hardware-based security platform for them.
...
The change here comes for the Speculative Store Bypass, known as Spectre v4, which AMD now has additional hardware to work in conjunction with the OS or virtual memory managers such as hypervisors in order to control. AMD doesn’t expect any performance change from these updates. Newer issues such as Foreshadow and Zombieload do not affect AMD processors.
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Re: What's AMD (Processors) up to? v2

Post by impar » Wed Jun 12, 2019 4:43 pm

Greetings!
thegrommit wrote:
Tue Jun 11, 2019 6:25 pm
Microarchitecture details:
https://www.anandtech.com/print/14525/a ... -epyc-rome
With the May 10th update to Windows, some additional features have been put in place to get the most out of the upcoming Zen 2 microarchitecture and Ryzen 3000 silicon layouts.

The optimizations come on two fronts, both of which are reasonably easy to explain.

Thread Grouping

The first is thread allocation. When a processor has different ‘groups’ of CPU cores, there are different ways in which threads are allocated, all of which have pros and cons. The two extremes for thread allocation come down to thread grouping and thread expansion.
...
Clock Ramping

For any of our users familiar with our Skylake microarchitecture deep dive, you may remember that Intel introduced a new feature called Speed Shift that enabled the processor to adjust between different P-states more freely, as well as ramping from idle to load very quickly – from 100 ms to 40ms in the first version in Skylake, then down to 15 ms with Kaby Lake. It did this by handing P-state control back from the OS to the processor, which reacted based on instruction throughput and request. With Zen 2, AMD is now enabling the same feature.
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Re: What's AMD (Processors) up to? v2

Post by thegrommit » Sat Jun 15, 2019 3:07 pm

One thing not mentioned by anandtech:

https://www.tomshardware.com/news/amd-r ... 39609.html
AMD is also bringing the auto-overclocking Precision Boost Overdrive (PBO) feature from its Threadripper lineup down to the mainstream chips. This feature allows Ryzen processors to communicate with the platform to modulate performance based on what the motherboard's power delivery subsystem can do, which is the key enabler for Precision Boost Overdrive.
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Re: What's AMD (Processors) up to? v2

Post by impar » Mon Jun 17, 2019 11:39 am

Greetings!
AMD X570 vs. X470, X370 Chipset Comparison, Lanes, Specs, & Differences

https://www.gamersnexus.net/guides/3482 ... comparison
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