Intel Skylake / Kaby Lake

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VirtualLarry

No Lifer
Aug 25, 2001
56,570
10,205
126
"But Intel sells A LOT of its top-end HEDT processor. I wouldn’t be surprised if the 10-core $1721 part was the bestselling Broadwell-E processor. So if AMD took that crown, Intel would lose a position it has held for a decade."

(from the AT front-page article on Skylake-X)

That's actually rather interesting, that the author seems to think that Intel's highest-end HEDT CPU, during the BDW-E era, was in fact their best-seller. I don't think that's true of the enthusiasts in this forum that purchased BDW-E, at least not that I've seen.

Generally, your "halo" product is NOT your "bestselling" product; generally that's something a few notches down in the product stack.
 

blue11

Member
May 11, 2017
151
77
51
Intel themselves states 15% and 10% performance uplift in specint 2006 for 7900x vs. 6950.
And thats for 2133 ram on the bwe and 2667 on the skl x. As seen in the footnotes too.

The 6950 is sold as 3.0 base
https://ark.intel.com/products/9445...ssor-Extreme-Edition-25M-Cache-up-to-3_50-GHz
The 7900x is sold as 3.3 base
http://ark.intel.com/products/123613/Intel-Core-i9-7900X-Processor-13_75M-Cache-up-to-4_30-GHz

15% IPC "plus" ? Its a stretch and then some. Did they regress for frequency then ?
We know where the performance is, and on a new process node i think they actually managed to get a slight bit of higher freq even for base. As is also seen by the spec sheets.
https://www.pugetsystems.com/blog/2...-What-You-See-Is-Not-Always-What-You-Get-675/

You can't compare CPUs by their base frequency, because nothing ever runs at base. The 6950X has an all-core turbo frequency of 3.4 GHz. We don't yet know the all-core turbo frequency of the 7900X, but it's probably not 3.9 GHz (+15%). Skylake-SP shows just under 10% IPC gain over Broadwell-EP in SPECint, so a 15% overall improvement would be consistent with a 3.6 GHz turbo frequency, which is quite plausible.
 

beginner99

Diamond Member
Jun 2, 2009
5,315
1,760
136
It definitely does not. Skylake E3 is 10% faster per clock than Haswell E3 in SpecCPU. If we assume all-core turbo is the same, maybe we are seeing 2-3% gain for the new cache arrangement. It's the best case though. Because there's such a big gap between base and Turbo for 7900X while the spread is much smaller on 6950X. It's 15% faster in single thread because SKL-X has clock speed advantage. That's with SKL-X using DDR4-2666 and BDW-E using DDR4-2133.

You thought diminishing returns in IPC was bad the past 10 years. Time to see the next 10. With Icelake we would be hard pressed to see 5%+ gains. Oh, how loud the cries would be on enthusiast forums when the gains for waiting 2-3 years become 2-3%.

Maybe all the cache changes achieve is higher clocks and less power use. No real IPC gain beyond the margin of error 2-3%.
 

dullard

Elite Member
May 21, 2001
25,856
4,437
126
"But Intel sells A LOT of its top-end HEDT processor. I wouldn’t be surprised if the 10-core $1721 part was the bestselling Broadwell-E processor. So if AMD took that crown, Intel would lose a position it has held for a decade."

(from the AT front-page article on Skylake-X)

That's actually rather interesting, that the author seems to think that Intel's highest-end HEDT CPU, during the BDW-E era, was in fact their best-seller. I don't think that's true of the enthusiasts in this forum that purchased BDW-E, at least not that I've seen.

Generally, your "halo" product is NOT your "bestselling" product; generally that's something a few notches down in the product stack.
I fully admit that this isn't a great resource, but it is at least one data point:
https://www.cpubenchmark.net/share30.html

The 6900K is the most used HEDT chip by their users by far (nearly 3x the users of the 6950K or the 6850K). Now, it may just happen to be that 6900K users benchmark their CPU more often than the owners of the other chips. But, I don't see why that would be the case. So, until we have actual numbers from Intel, I have to assume that the 6900K is the best seller of the HEDT chips.
 

Phynaz

Lifer
Mar 13, 2006
10,140
819
126
I'm not pleased with the 140W TDP of the 7800x, but dang it's a hell of a CPU for the price.

I sure hope AMD was keeping one in the chamber.
 

blue11

Member
May 11, 2017
151
77
51
To get 1 TFLOP with AVX-512 on a 18-core CPU with two FMA units you need about ~900 MHz.

As a reminder KNL gets 6 TFLOP. Of course I'd not hesitate between i9 and Phi
Intel quotes throughput figures for double-precision. Still, it's not looking good for AVX-512 on Skylake-X. I just crunched the numbers, and 1 TFLOP/s is consistent with AVX2 running at 3.5 GHz.

3.5 GHz * (256 / 64) * 2 * 2 * 18 = 1000 GFLOP/s

Perhaps the 18-core SKU will have an extremely low AVX frequency of 1.8 GHz, but that doesn't really make things any better.
 
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swilli89

Golden Member
Mar 23, 2010
1,558
1,181
136
I'm not pleased with the 140W TDP of the 7800x, but dang it's a hell of a CPU for the price.

I sure hope AMD was keeping one in the chamber.
What? They already have an 8-core SKU at this price on a much cheaper platform.. The cost of this "entry" 6 core will still cost $600 or more to buy.

The 1700X has double the cache, 33% more cores at the same price... Not to mention the platform is probably half the cost.
 

blue11

Member
May 11, 2017
151
77
51
What? They already have an 8-core SKU at this price on a much cheaper platform.. The cost of this "entry" 6 core will still cost $600 or more to buy.

The 1700X has double the cache, 33% more cores at the same price... Not to mention the platform is probably half the cost.
The X299 motherboard pricing is going to be the nail in the coffin. With AMD, you can pay $300 for a R7 1700, add another $80 for a B350 board, and OC all the way to 4 GHz. Intel is simply lost and without a clue.
 

beginner99

Diamond Member
Jun 2, 2009
5,315
1,760
136
Based on the chart, it looks like they're drawing the distinction between i7 and i9 on the number of PCIe lanes.

Yeah and I suspect AVX-512 performance as well. Else the $ difference between 8 and 10 core doesn't make much sense.
 

krumme

Diamond Member
Oct 9, 2009
5,956
1,595
136
I agree with you. Definitional arguments aside, the "competition" (as perceived by the average consumer) will not lead to as much competition as some hope. AMD and Intel have different strengths and segmentation strategies. Ultimately, this means that there really isn't 1:1 overlap in a lot of cases, making it possible for both to preserve their desired margins.

I tend to disagree a bit here. What is special for x86 cpu is the enormous entry cost. What is also special is intel is say 10 times as big as amd due to also the entry cost. When the product hits the street much is sunk cost already. Its skews the normal situation as especially the lesser party here amd will try to recover those sunk cost. In this game they can do that as its hidden due to their size. They use their capacity and get optimal profit. Intel have only a slight hit on revenue and also get optimal profit.
 

ManyThreads

Member
Mar 6, 2017
99
29
51
Could someone please comment on how AVX 512 might make a difference to the average user? Primarily I would be interested if it made a difference in Photoshop.

Prices look great - $599 USD for the 8-core should be $800 CAD which is cheaper than the Broadwell-E 6-core. Just wondering if it's worth paying double for AVX 512 or not with the 10C.
 

AdamK47

Lifer
Oct 9, 1999
15,668
3,527
136
I have a few questions that remain unanswered. Perhaps the info is out there and I just missed it. Just throwing this out there for anyone to answer.

1. Intel is "launching" these CPUs today. When is availability? Is it at the end of this month?
2. Will X99 coolers fit the X299? The layout looks the same from the photos I've seen.
3. Will the higher end motherboards like the Asus Rampage VI Extreme be available when the CPUs are available?
 

ManyThreads

Member
Mar 6, 2017
99
29
51
No effect whatsoever in Photoshop, unless you are writing your own custom plugins.

Thank you for saving me ~$600

Clock speeds sure are impressive with the 10C though - no penalty whatsoever if you just use Intel's turbos.

Another tidbit I picked up is that the Turbo 3.0 is for two cores, not one - not sure if that's new or not.
 

tamz_msc

Diamond Member
Jan 5, 2017
3,865
3,729
136
Thank you for saving me ~$600

Clock speeds sure are impressive with the 10C though - no penalty whatsoever if you just use Intel's turbos.

Another tidbit I picked up is that the Turbo 3.0 is for two cores, not one - not sure if that's new or not.
Yes Turbo 3.0 for two cores is something new. Should be useful in Photoshop as it likes having a few fast cores.
 
Reactions: Drazick

Shivansps

Diamond Member
Sep 11, 2013
3,916
1,570
136
The X299 motherboard pricing is going to be the nail in the coffin. With AMD, you can pay $300 for a R7 1700, add another $80 for a B350 board, and OC all the way to 4 GHz. Intel is simply lost and without a clue.

Petty sure thats what CFL-S is for.
 
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