Intel Skylake / Kaby Lake

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Ajay

Lifer
Jan 8, 2001
16,094
8,106
136
What's with all this Ryzen garbage in the Intel thread?

Sorry, fell for it again . One of us should have started a new thread on Intel's financials in expectation that it would start and AMD vs. Intel debate.
 

Shivansps

Diamond Member
Sep 11, 2013
3,873
1,527
136
This whole AVX512 support favoring Intel story is a bit of overhyping, IMO. Think of applications that are CPU FPU-bound - linear algebra(LINPACK), signal processing(FFTs), data analysis(lots of math functions) - these are the things that would obviously benefit from wider vector SIMD registers. But there are a lot of other workloads that are mostly I/O bound, especially with large data sets. Eulerian CFD, FEM analysis, basically most of the things that involve solving differential equations are I/O bound.

There is a point after which one has to really think, are all these vector computations done on the CPU actually worth the trade-offs in heat and power consumption, due to fitting bigger and bigger registers on the CPU for a specialized task like vectorized data processing? At that point, the logical thing to do would be to move to things like Xeon Phi or GPUs.

We need to check instruccions and registers, but the whole point of AVX-512 on Xeons is to integrate the capabilities of the Phi Coprocessor.

Not sure how gonna impact on regular software... maybe encoders?
 

tamz_msc

Diamond Member
Jan 5, 2017
3,865
3,729
136
We need to check instruccions and registers, but the whole point of AVX-512 on Xeons is to integrate the capabilities of the Phi Coprocessor.

Not sure how gonna impact on regular software... maybe encoders?
None of the things I mentioned can be termed as 'regular software'. Encoding benefits from AVX because it uses a lot of techniques that I mentioned are FPU-intensive. Vectorizing your code is the only way to extract the best out of those special registers that you have on your CPU, compilers can only do so much. Writing vectorized code, and identifying the parts of code that can be accelerated through AVX is a non-trivial task, and is beyond the realm of capabilities of your average user.

That is why AVX is a big thing in certain segments of the scientific computing establishment. Any benefit in consumer applications would be nothing more than a trickle-down effect. SSE can take care of most of your needs almost all the time.
 
Mar 10, 2006
11,715
2,012
126
TSX didn't work on Haswell. And neither did it on Broadwell. Not easy to get it right it seems.

TSX was enabled on the Haswell Xeon E7 chips, but it was disabled on Xeon E5 Haswell (as well as client Haswell). It works on Broadwell-EP, Skylake, and Skylake Xeon.
 

xdfg

Member
Mar 6, 2017
25
5
36
This whole AVX512 support favoring Intel story is a bit of overhyping, IMO. Think of applications that are CPU FPU-bound - linear algebra(LINPACK), signal processing(FFTs), data analysis(lots of math functions) - these are the things that would obviously benefit from wider vector SIMD registers. But there are a lot of other workloads that are mostly I/O bound, especially with large data sets. Eulerian CFD, FEM analysis, basically most of the things that involve solving differential equations are I/O bound.

There is a point after which one has to really think, are all these vector computations done on the CPU actually worth the trade-offs in heat and power consumption, due to fitting bigger and bigger registers on the CPU for a specialized task like vectorized data processing? At that point, the logical thing to do would be to move to things like Xeon Phi or GPUs.

AVX-512 is not even going to be a story, since Intel is playing their segmentation game again and keeping it for only the highest Platinum bins. Just another example of bait and switch, and all the more reason AMD is going to destroy them with Naples. With all these bazillion SKUs, each with only one of the features you want, clients are going to be fed up and just go with Naples, where every chip has all the features. Furthermore, the advantage in price-per-core, pure number of cores, and not to mention Zen's superior TDP, will erase any advantage AVX-512 might have, even if clients pay out the arse ($12000 for only 28 cores!) for those specific SKUs.
 

Sweepr

Diamond Member
May 12, 2006
5,148
1,142
131
Just double confirmed this bit of information with a source:

Skylake-SP LCC = 10C/20T
Skylake-SP MCC = 18C/36T
Skylake-SP HCC = 28C/56T

This means the Skylake-X 12C SKU for LGA 2066 is based on the MCC server die. The new HEDT platform (Basin Falls) is able to accommodate 14C, 16C and 18C beasts, if Intel eventually chooses to release them for desktop users.
 
Reactions: Drazick

jpiniero

Lifer
Oct 1, 2010
14,831
5,444
136
Just double confirmed this bit of information with a source:

Skylake-SP LCC = 10C/20T
Skylake-SP MCC = 18C/36T
Skylake-SP HCC = 28C/56T

This means the Skylake-X 12C SKU for LGA 2066 is based on the MCC server die. The new HEDT platform (Basin Falls) is able to accommodate 14C, 16C and 18C beasts, if Intel eventually chooses to release them for desktop users.

That's pretty costly if true, given Intel wasn't planning on doing a 12C for HEDT in the first place. Having to re-package it to work with LGA 2066, not to mention the 6-channel memory die space taken up that it can't use...
 

Markfw

Moderator Emeritus, Elite Member
May 16, 2002
25,740
14,772
136
What's with all this Ryzen garbage in the Intel thread?
Well it started with this quote "If the pretty strong rumors are true, Intel will be up against 16 core/ 32 thread Ryzen cpu's not AMD'S mainstream platform. AFAIK, Skylake-X will be offering a top end 12 core to compete with AMD's hedt."

And when I was defending Ryzen against the BS coming my way, I defended my position.

As far as this thread, it is pertinent to post about what these new CPU's will be up against, but the Intel fanboys will not listen, they just keep spouting the same old crap. If we could have a reasonable discussion about the situation, it would be more enlightening.
 

Shivansps

Diamond Member
Sep 11, 2013
3,873
1,527
136
Again, that is not true, unless AMD wants to put the 16C cheaper than a 1800X, the 6C Skykake X starts at about the same price range as the 6800K, 400.
 

Markfw

Moderator Emeritus, Elite Member
May 16, 2002
25,740
14,772
136
Again, that is not true, unless AMD wants to put the 16C cheaper than a 1800X, the 6C Skykake X starts at about the same price range as the 6800K, 400.
$400 for a 6c/12t CPU will loose to a Ryzen 8c/16t@$330

So, what is not true ?

And my "guesses" as based on facts about todays Intel and AMD chips.
 
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Sweepr

Diamond Member
May 12, 2006
5,148
1,142
131
Skylake-X 6C/12T will compare very farourably to any Ryzen part as far as performance is concerned. This SKU has the potential to offer better performance per clock than other Skylake based products, with the added advantage of higher overclocks than the competition (4.5 GHz+ should be doable with 14nm+). And as far as mainstream platforms are concerned, a possible Coffee Lake-S 6C/6T part replacing Core i5-7600K coupled with a cheap compatible LGA 1151 motherboard will become the new gamer's choice.
 
Mar 10, 2006
11,715
2,012
126
Skylake-X 6C/12T will compare very farourably to any Ryzen part as far as performance is concerned. This SKU has the potential to offer better performance per clock than a regular Skylake/Kaby Lake/Coffee Lake, with the added advantage of higher overclocking potential than the competition (4.5 GHz+ should be doable). And as far as mainstream platforms are concerned, a possible Coffee Lake-S 6C/6T part replacing Core i5-7600K + cheap compatible LGA 1151 should become the new gamer's favorite.

Skylake-X should have the advantage of higher IPC (Skylake client already beats Zen here; Skylake-X will be even better). Skylake-X should also have more PCIe lanes on the CPU, a more robust platform (look at X299 features compared to X370), higher clock headroom (14nm+ and optimized circuit design versus the lower frequency capability of Ryzen), and AVX-512 for people who might be able to make use of that (video encoding?)
 
Reactions: Sweepr

Ajay

Lifer
Jan 8, 2001
16,094
8,106
136
As far as this thread, it is pertinent to post about what these new CPU's will be up against, but the Intel fanboys will not listen, they just keep spouting the same old crap. If we could have a reasonable discussion about the situation, it would be more enlightening.

RichUK, myself and a couple of others have been trying to keep this particular, huge, thread on Intel processors free of the normal AMD vs Intel discussions so that it remains a good resource of Intel CPU info. We are not doing that just to keep our heads stuck in the sand. I've also tried to limit my own comparisons in Ryzen threads, for the same reason. If I could come up with a good thread title that would attract most of the incoming for debates on Ryzen vs Core, I would. Heck, Ryzen vs Core Debate Thread sounds good - I'll give it a whirl.
 

Markfw

Moderator Emeritus, Elite Member
May 16, 2002
25,740
14,772
136
Skylake-X 6C/12T will compare very farourably to any Ryzen part as far as performance is concerned. This SKU has the potential to offer better performance per clock than a regular Skylake-S, with the added advantage of higher overclocks than the competition (4.5 GHz+ should be doable). And as far as mainstream platforms are concerned, a possible Coffee Lake-S 6C/6T part replacing Core i5-7600K + cheap compatible LGA 1151 should become the new gamer's favorite.
So an Intel 14c/28t CPU can barely beat a 8c/16t Ryzen, but you are trying to convince everyone that a NEW 6c/12t will compare. Based on what ? No benchmarks ? Just speculation, so don't say "WILL", thats trolling. "I would guess" or more appropriate.
 

Sweepr

Diamond Member
May 12, 2006
5,148
1,142
131
Thanks Ajay. And yes, better let the benchmarks talk by themselves when Skylake-X reviews are out. I'm hoping for some leaks from next week's media briefing.
 
Reactions: Ajay and Drazick

mikk

Diamond Member
May 15, 2012
4,172
2,210
136
So an Intel 14c/28t CPU can barely beat a 8c/16t Ryzen, but you are trying to convince everyone that a NEW 6c/12t will compare. Based on what ? No benchmarks ? Just speculation, so don't say "WILL", thats trolling. "I would guess" or more appropriate.


Ryzen 8C barely beats Kabylake 4C, with decent clock speeds Intels 6C on Skylake uArch will be the better choice overall.


and AVX-512 for people who might be able to make use of that (video encoding?)

Also a much faster AVX2 implementation. Ryzen is very poor in this regards.
 

raghu78

Diamond Member
Aug 23, 2012
4,093
1,475
136
$400 for a 6c/12t CPU will loose to a Ryzen 8c/16t@$330

So, what is not true ?

And my "guesses" as based on facts about todays Intel and AMD chips.

Even though I am a strong AMD supporter I think the first gen Ryzen 7 which maxes out at 4-4.1 Ghz will probably lose to a mainstream Coffeelake 6C/12T CPU built on Intel 14++ process (12% faster transistor performance than 14+ which Kabylake is built on) even for multithreaded workloads as I expect a 5.2 Ghz OC easily given the significantly higher transistor performance.

I think with Zen 2 if AMD can get clocks upto 4.5-4.6 Ghz with a decent IPC bump (5-10%) then we can see the Ryzen 7 again take the lead back from Coffeelake 6C/12T for multi threaded programs which scale well like Rendering, Video encoding while staying roughly 15-20% behind Coffeelake on max single thread performance. I think eventually AMD should use the following pricing and core/thread configurations with mainstream Zen 2. Hopefully they can stay close behind Intel Coffeelake for single thread perf (15-20% slower at max OC). Thats going to be the key to their attractiveness.

8C/16T flagship - USD 399 - 429
2nd SKU - USD 349 - 379
3rd SKU - USD 299 - 329

6C/12T top SKU - USD 229 - USD 249
2nd SKU - USD 199 - USD 219

4C/8T top SKU - USD 169 to USD 179
2nd SKU - USD 149 to USD 159

4C/4T top SKU - USD 119 to USD 129
2nd SKU USD 99 to USD 109

At the end of the day we consumers benefit the most if AMD can compete with Intel with future generations of Zen. The next few years should be very interesting for the mainstream/enthusiast PC desktop market.
 
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mikk

Diamond Member
May 15, 2012
4,172
2,210
136
You're thinking gaming. I don't think that's what the other guy is referring to.


As for gaming Kabylake 4C is faster in most cases. I'm talking about a mix of real world usage including both games and applications. If Coffe Lake comes close to Kabylake clock speeds, which might be possible even with 6C because of 14nm++, Intel has a winner in both metrics. Don't forget Ryzen is subpar in many applications.
 

Ajay

Lifer
Jan 8, 2001
16,094
8,106
136
Well, if nobody cares to shutdown this discussion here then I'll take a bit of a vacation from this thread. I've just wanted the signal to noise ratio to be higher here. I don't care if ppl think that is fanboish or not. It nice to have a thread that focus on one group of products and avoids a fanboi posting war.

@Sweepr - very much looking forward to *any* info on Skylake-X. If I go that way, I might be taking a risk of a negative OOTB experience, especially since Intel moved the date forward. If I felt I could wait, I might wait for a 6 core CFL (meets all my current requirements) and has additional platform features due to series 300 chipsets. Otherwise, the 'E' platforms have offered allot of capability on MT & ST for a long time. Intel just needs to take care that the prices are noncompetitive.
 

Sven_eng

Member
Nov 1, 2016
110
57
61
Even though I am a strong AMD supporter I think the first gen Ryzen 7 which maxes out at 4-4.1 Ghz will probably lose to a mainstream Coffeelake 6C/12T CPU built on Intel 14++ process (12% faster transistor performance than 14+ which Kabylake is built on) even for multithreaded workloads as I expect a 5.2 Ghz OC easily given the significantly higher transistor performance..

5.2GHz easily on 6 cores when KBL can't reliably do 5GHz OC with 4 cores?
 
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