[TheNextPlatform] A DEEP DIVE INTO AMD’S ROME EPYC ARCHITECTURE - Overclock.net - An Overclocking Community

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[TheNextPlatform] A DEEP DIVE INTO AMD’S ROME EPYC ARCHITECTURE

 
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post #1 of 7 (permalink) Old 08-17-2019, 03:19 PM - Thread Starter
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[TheNextPlatform] A DEEP DIVE INTO AMD’S ROME EPYC ARCHITECTURE

Source: https://www.nextplatform.com/2019/08...-architecture/

Quote:
In any chip design, the devil – and the angel – is always in the details. AMD has been burned by some architectural choices it has made with Opteron processors in the past, where assumptions about how code might exploit the hardware did not pan out as planned. The company seemed intent on not repeating mistakes with the follow-ons with the venerable Opteron processors, which had excellent designs at first, with the second generation of Epyc server chips.

Time – and customers – will tell, but this derivative kicker implemented in a much-improved multichip design with more advanced etching processes for the cores seems to be hitting the server market with precisely what it wants when it needs it most. And this bodes well for the future of the Epyc chips as an alternative to current and future Xeon chips from Intel.

We have been itching to get into the architectural details of the new “Rome” Epyc server chips, which we covered at the launch last week with the basic feeds, speeds, slots, watts, and pricing. Now, let’s jump into the architectural details of the Rome processors with Mike Clark, lead architect of the Zen cores and a corporate fellow at AMD as well. In many ways, Rome, with its Zen 2 core and mixed process multichip module design, is the processor that AMD must wish it could have put into the field two years ago. Everything about it is better, and it all starts with the etching of the cores and their associated L1 and L2 caches in the 7 nanometer processes from fab partner Taiwan Semiconductor Manufacturing Corp.

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post #2 of 7 (permalink) Old 08-17-2019, 04:02 PM
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post #3 of 7 (permalink) Old 08-21-2019, 08:37 PM
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what are these cores like compared to 2000's era single core, and then x2, x4 core CPU's ? Are they just getting smaller , and each does less, or at least focus's on less, but there's more of them ?

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post #4 of 7 (permalink) Old 08-22-2019, 07:10 AM
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Quote: Originally Posted by Kaltenbrunner View Post
what are these cores like compared to 2000's era single core, and then x2, x4 core CPU's ? Are they just getting smaller , and each does less, or at least focus's on less, but there's more of them ?

They are actually getting smaller, lower power, and have more hardware built in for extra functionality and instruction sets, and are getting faster on top of that, AND more cores to top it all off.

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post #5 of 7 (permalink) Old 08-22-2019, 08:06 AM
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Quote: Originally Posted by Kaltenbrunner View Post
what are these cores like compared to 2000's era single core, and then x2, x4 core CPU's ? Are they just getting smaller , and each does less, or at least focus's on less, but there's more of them ?
Simple answer, no, all cores in AMD's Epyc 2 chips are full blood cores, the same as in Ryzen. They a physically smaller due to node changes, but they do not have reduced functionality.
-------------------

Long answer... Block diagrams make this easy.

AMD's Athlon (K7) arch would be 2000-ish, so I guess we'll start there.
Spoiler!



Toss in a Phenom II arch:
Spoiler!



Maybe a Bulldozer:
Spoiler!



And then we have Zen and Zen 2:
Spoiler!


And for point of comparison, we'll include a Cascade Lake digram.
Spoiler!


I can get into more detail later, but no, these cores themselves are not focused or weaker, the design AMD is using just allows them to cram in way more due to fewer manufacturing limitations.

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post #6 of 7 (permalink) Old 08-22-2019, 08:49 AM
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Quote: Originally Posted by KyadCK View Post
Simple answer, no, all cores in AMD's Epyc 2 chips are full blood cores, the same as in Ryzen. They a physically smaller due to node changes, but they do not have reduced functionality.
-------------------

Long answer... Block diagrams make this easy.

AMD's Athlon (K7) arch would be 2000-ish, so I guess we'll start there.
Spoiler!



Toss in a Phenom II arch:
Spoiler!



Maybe a Bulldozer:
Spoiler!



And then we have Zen and Zen 2:
Spoiler!


And for point of comparison, we'll include a Cascade Lake digram.
Spoiler!


I can get into more detail later, but no, these cores themselves are not focused or weaker, the design AMD is using just allows them to cram in way more due to fewer manufacturing limitations.
Your Phenom II diagram isn't loading, at least not for me.
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post #7 of 7 (permalink) Old 08-23-2019, 07:43 AM
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I can now see why it's took AMD so long to release these. Rome wasn't built in a day.

Quote:Originally Posted by TheBadBull https://www.overclock.net/img/forum/go_quote.gif

I'm a level 5 vegan. I don't eat anything that casts a shadow.

It's also why I eat my bacon in the dark ????????????????
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