New Zen microarchitecture details

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itsmydamnation

Platinum Member
Feb 6, 2011
2,868
3,419
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True, but we do hear that it is *process*-related.


Power efficiency and only that.
Look at an average servers clock, in the 2-3ghz range who says its less efficient?

What do you mean? It's not that easy to pack in 12 DIMMs per socket as is.
I mean AMD have more memory controllers then a E7 Xeon per socket. That's more memory bandwidth and more memory per socket. That is very important in VM farms, VM farms are massively constrained by memory throughput and total memory ( you cant over subscribe memory like you can CPU).

Perf/cost of ownership, nothing else, last time i checked.
Never that simple unfortunately (layer 8/9 issues). In a standard 2P system to hit 512gb of memory E7 need's 32gb dimm's Zen can do that with 16gb Dimms. like wise 1TB, 2TB ( 64/128gb dims) at those sizes memory is the single biggest hardware cost. So it will be interesting to see how this plays out in the market. But to my clients being able to say within a 16gb or 32gb dimm size is critical to getting good value for money.
 

lolfail9001

Golden Member
Sep 9, 2016
1,056
353
96
^ and you have no info on cost of ownership of zen. and only ballpark info on performance.
Luckily i can safely assume cost of purchase to be close enough and look at power efficiency ballpark for estimate. So far looks to me like Intel still has the edge here. And by no means i think it is significant in small scale. But on large enough scale? Certainly.
I see, you're complaining about the 4C part. If this is not just an ES for fun (bug hunting, sys development, testing, etc.), but will turn into a real product, then it looks to be a harvested product (there are only physical 8C dies), which exists based on its bad characteristics in the first place.
Well, if we go with 8C for reference then it is 3.3Ghz all-core turbo against 3.5Ghz all-core turbo on harvested product with larger uncore. Not that great either.
Look at an average servers clock, in the 2-3ghz range who says its less efficient?
That's a valid objection, but i dare guess that it does not get much better at lower clocks.
I mean AMD have more memory controllers then a E7 Xeon per socket. That's more memory bandwidth and more memory per socket. That is very important in VM farms, VM farms are massively constrained by memory throughput and total memory ( you cant over subscribe memory like you can CPU).
My point here is a simple request for you to demonstrate a concept for 16 DIMMs per socket on any motherboard in existence. I want to see how cramped up it is. I'll give you that Naples should have more bandwidth.
Zen can do that with 16gb Dimms.
Once again, you are assuming that it will have 16 DIMMs per socket, not 8. Illustrate that, please.
P. S. Though it has to be said, a quad socket machine would do with 16gb dimms just fine.
 

itsmydamnation

Platinum Member
Feb 6, 2011
2,868
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That's a valid objection, but i dare guess that it does not get much better at lower clocks.
if its process related it very well might.

My point here is a simple request for you to demonstrate a concept for 16 DIMMs per socket on any motherboard in existence. I want to see how cramped up it is. I'll give you that Naples should have more bandwidth.
Here is a 1/2 height UCS b200 blade with 24 Dimm's, I think we can fit 32Dimms in a 1 RU pizza box
http://www.karma-group.ru/Sites/karma/Uploads/ucs_b200_m3_2.4CB167C261C44A2986DBB43AC193D074.jpg
I've pulled memory in and out of these all the time ( my teams lab boxes are UCS blade chassis) and there's not space issues.

if you go a east/west hyper converged model VM farm your more likely to have 2 RU boxes so you can fit In as much disk as possible making it even less of an issue (power supplies can be taller and narrower etc).
Once again, you are assuming that it will have 16 DIMMs per socket, not 8. Illustrate that, please.
P. S. Though it has to be said, a quad socket machine would do with 16gb dimms just fine.
I fully expect 16dimms a socket because that's whats going to give an actual advantage, to only go 8 dimms a socket is a disadvantage.


edit: here is a nice 4P board with 48 DIMM's, so plently of room for 2P with 32
http://www.intel.de/content/dam/www...server-board-s4600lh-s4600lt-back-view-lg.jpg
 

kraatus77

Senior member
Aug 26, 2015
266
59
101
Luckily i can safely assume cost of purchase to be close enough and look at power efficiency ballpark for estimate. So far looks to me like Intel still has the edge here. And by no means i think it is significant in small scale. But on large enough scale? Certainly.

Well, if we go with 8C for reference then it is 3.3Ghz all-core turbo against 3.5Ghz all-core turbo on harvested product with larger uncore. Not that great either.
Not sure if serious.

"3.3Ghz all-core turbo @95w against 3.5Ghz all-core turbo @140w"

tell me who has the edge here ? or you will back-paddle to "oh we don't have enough info on this and that". as i said nobody knows cost of ownership of zen.

i'm not saying it will be better but not dismissing the possibility of it either.
 

thecoolnessrune

Diamond Member
Jun 8, 2005
9,673
580
126
Yeah, Broadwell-EP supports 3 DIMMs per channel. You take a performance hit if you use three though so I bet it's rare in actual usage. I'm guessing the slots that are blue are the slow ones.

Yeah, Broadwell-EP is able to maintain 2400Mhz with 2 channels occupied, but at 3DPC, it falls to 1866Mhz for all memory installed.

That's still way better than Sandy Bridge, which falls to 1066Mhz at 3DPC. If Zen makes for a memory dense platform with Haswell IPC, I'll consider replacing my current environment with it, as I'm memory constrained (16 8GB DIMMs). Moving to more sockets to get more memory doesn't work well for virtualization costs because everything is priced by the socket. That's an area where Zen could do very well.
 

Elixer

Lifer
May 7, 2002
10,376
762
126
It is not finished product. A0 still.
I suppose it is possible that they found no issues with A0, that would be pretty rare, but not unheard of.

Normally, it was said that you need 45-60 days between steppings, so if A0 is final silicon they could make that Feb deadline that was mentioned. If not, then looks like this could get pushed to into May/June.
For all we know, they might even have a Samsung made chip up and running as well that is a later revision.
 

KTE

Senior member
May 26, 2016
478
130
76
As discussed before, I'd be very surprised if A0 was final silicon...

Sent from HTC 10
(Opinions are own)
 

bjt2

Senior member
Sep 11, 2016
784
180
86
I suppose it is possible that they found no issues with A0, that would be pretty rare, but not unheard of.

Normally, it was said that you need 45-60 days between steppings, so if A0 is final silicon they could make that Feb deadline that was mentioned. If not, then looks like this could get pushed to into May/June.
For all we know, they might even have a Samsung made chip up and running as well that is a later revision.
This is same stepping as the Hot chips presentation... If they stick to feb 17 volume, i think that at least two other steps are produced... I think that a new step is already in the labs...
Moreover they have new improved silicon for Polaris, and I bet that similar gains will be get also on Zen, probabily even with this hidden new step...
 

lolfail9001

Golden Member
Sep 9, 2016
1,056
353
96
Not sure if serious.

"3.3Ghz all-core turbo @95w against 3.5Ghz all-core turbo @140w"

tell me who has the edge here ? or you will back-paddle to "oh we don't have enough info on this and that". as i said nobody knows cost of ownership of zen.

i'm not saying it will be better but not dismissing the possibility of it either.
Once again, check actual power consumption instead of TDP bracket. Intel could really label 6900k as 95W TDP chip if they wanted to be as misleading as AMD sometimes are
I fully expect 16dimms a socket because that's whats going to give an actual advantage, to only go 8 dimms a socket is a disadvantage.
Well, that's the thing. Your own pictures have DIMMs + 2 narrow sockets take up entire board width. 16 DIMMS and what is most likely a larger socket (i mean, 8 channels, come on) just means it would take a really funky DIMM layout to fit in.
 

itsmydamnation

Platinum Member
Feb 6, 2011
2,868
3,419
136
Well, that's the thing. Your own pictures have DIMMs + 2 narrow sockets take up entire board width. 16 DIMMS and what is most likely a larger socket (i mean, 8 channels, come on) just means it would take a really funky DIMM layout to fit in.

Only on that particular blade enclosure, in pizza boxes your fine and a blade chassis with an extra RU of height your fine. I fully expect intel in the future to add more memory channels as well as they continue to increase cores per socket.

Personally i'm not that big of a fan of blade enclosures anyway, you only gain a couple of RU once power supplies/fan are factored in, sometimes you loose that anyway because you can't fit more then 3 enclosures in most racks and your tied into the vendors crappy network/fibre switch.
 

kraatus77

Senior member
Aug 26, 2015
266
59
101
Once again, check actual power consumption instead of TDP bracket. Intel could really label 6900k as 95W TDP chip if they wanted to be as misleading as AMD sometimes are

Exactly. so why you were doing this -

Look: plain 6700 has 4Ghz single core boost, 3.6Ghz all core boost and 3.4Ghz base clock and iGPU @ 65W. Compared to 3.1Ghz all core turbo, 3.4Ghz single core turbo without iGPU in 65W. Uncore is fairly similar as well.

which actually consumes pretty much same and more than 85w as 6700k does. which is rated @91w.



funny you did exactly what you tell others not to do.
 
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mikk

Diamond Member
May 15, 2012
4,175
2,211
136
Exactly. so why you were doing this -



which actually consumes pretty much same and more than 85w as 6700k does. which is rated @91w.


For the entire system by the looks of it because in idle it is over 30W for all CPUs. And you need more tests than this to prove that the non K consumes as much as the K variant. And even then, you should differentiate between AVX2 stress tests and real world, since Zen most likely is no match where AVX2 matters much.
 

kraatus77

Senior member
Aug 26, 2015
266
59
101
Nice try shifting goalposts, read what the argument was then ask for million tests. i know 1 test isn't enough to determine something but someone is so confident about some stuff that he even goes against his advice to justify himself.

as i have said before, we don't really have enough info about anything power and price of zen and even performance is just a ballpark figure. it can be either positive or negative. just wait and watch.
 

The Stilt

Golden Member
Dec 5, 2015
1,709
3,057
106
Exactly. so why you were doing this -



which actually consumes pretty much same and more than 85w as 6700k does. which is rated @91w.



funny you did exactly what you tell others not to do.

"Estimating" the CPU power draw based on system total power draw is pure guess work.

Hardware.fr measures the VRIn power on all CPUs they review, at stock and overclocked settings using Prime95. You cannot perfectly estimate the actual power consumption even based on VRIn power, but you'll get well within < 5% in most cases.
Based on Hardware.fr figures:

i7-6950X - 103.488W
i7-6900K - 109.824W
i7-6800K - 87.648W
i7-6700K - 78.54W
i5-6600K - 69.36W
i7-5960X - 133.056W
i7-5930K - 130.944W
i7-5820K - 112.992W

88% efficiency used to estimate the power draw of FIVR parts (Haswell-E & Broadwell-E) and 85% for non-FIVR parts (Skylake). The functional portion of the CPU (i.e non-FIVR portion) on FIVR equipped parts consumes even less than that, since the efficiency of FIVR itself is just 78 - 80%.

Skylake: http://www.hardware.fr/articles/940-21/cpu-overclocking-pratique.html
Broadwell-E: http://www.hardware.fr/articles/946-4/overclocking-consommation.html
Haswell-E: http://www.hardware.fr/articles/924-6/overclocking.html
 

kraatus77

Senior member
Aug 26, 2015
266
59
101
Reading something and getting stuck on only 1 part is really a problem. specially in this forum. why do i always forget what this forum actually called as.
 

Ansau

Member
Oct 15, 2015
40
20
81
Exactly. so why you were doing this -
which actually consumes pretty much same and more than 85w as 6700k does. which is rated @91w.



funny you did exactly what you tell others not to do.

Do you realize this is overall system power consumption?
 
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KTE

Senior member
May 26, 2016
478
130
76
Tools are getting better, as do FPGAs, etc.

This likely is also mask cost driven.
I would still be very surprised, from a totally new uarch and process standpoint. I'd suspect the pushout from Q4 to Q1 was for clocks@power rather than anything else.


Not speaking for my employer here.

Sent from HTC 10
(Opinions are own)
 

Mikeduffy

Member
Jun 5, 2016
27
18
46
Once again, check actual power consumption instead of TDP bracket. Intel could really label 6900k as 95W TDP chip if they wanted to be as misleading as AMD sometimes are

Yeah, like Nvidia's TDP numbers with respect to Maxwell. ;-)

Anyways guys, be careful about lolfail9001, he's an notorious anti-AMD Poster from HardOCP and Reddit. I wouldn't waste my time engaging with him.
 
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jpiniero

Lifer
Oct 1, 2010
14,842
5,457
136
I would still be very surprised, from a totally new uarch and process standpoint. I'd suspect the pushout from Q4 to Q1 was for clocks@power rather than anything else.

It may have been just clocks period, but I would be surprised if AMD increases the TDP of the final SR. Putting a single core turbo in the mid 3's would at least would give you confidence that you should be able to at least overclock to that with all cores enabled.
 

The Stilt

Golden Member
Dec 5, 2015
1,709
3,057
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A new, higher (> 2.8GHz / 3.2GHz) clocked SKU than we've seen so far might exist, but if it does it has to be very recent since it is completely under my radar.

It is not finished product. A0 still.

On what do you base this statement on?
There is no predefined pattern for naming the revision. Some major revisions might have a single minor revision ("node") while some might have five or even more. New revisions are made only when it is absolutely critical.

For example Bulldozer (i.e Orochi B) had six minor revisions for it's launch stepping (B2a to B2g). Of which the final one (G node) arrived only few days prior the release. The G-node arrived so late that some of the reviewers had originally received an F-node CPU, which was then exchanged for a proper one for the review.

Zeppelin might still be at A0 major revision, but it's node is the nth one
 

imported_ats

Senior member
Mar 21, 2008
422
63
86
Only on that particular blade enclosure, in pizza boxes your fine and a blade chassis with an extra RU of height your fine. I fully expect intel in the future to add more memory channels as well as they continue to increase cores per socket.

1U pizza boxes are pretty much dead, at least as far as volume is concerned. 2x4s (and 1x3s for wide racks) have pretty much replaced 1Us for anything except disk boxes.

As far as more memory channels, it is already well known that next gen Xeons will be 6 channels.
 
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