Intel Skylake / Kaby Lake

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Sweepr

Diamond Member
May 12, 2006
5,148
1,142
131
Sneak Peek at Kaby Lake-S Overclocking - Retail Core i5-7600K (B0) Pushed to 5.1 GHz

- Cinebench R15 @ Default (3.8-4.2 GHz)




- Cinebench R15 @ 5.1 GHz




*Memory: DDR4-3733 16-18-18-38 8 GB x2

More to come!
 

wingman04

Senior member
May 12, 2016
393
12
51
@wingman04 , The processor being 64 Bit has nothing to do with how much data it can handle at once.
Nothing to do.
There are DSP's which are 16 Bit and access much more data than an Intel CPU.

Again, CPU's has muli layer memory hierarchy.
As closer we get to the CPU the faster and smaller the memory is.
The problem, since it gets smaller (Register smaller than L1, smaller than L2, smaller than L3 which is smaller than memory).
Yet if the data being processed is large while the operation on the data is simple (Which the CPU can handle using its full power) we're bottlenecked by the main memory system.

This is why faster DDR4 are showing gains in SkyLake.
Yet since the speed can't be multiplied by 2 it would be easier to double the number of channels.
Again, whether the CPU is 64 Bit or 32 Bit doesn't have any affect on how the data throughput.
It only means how are the memory address is.
My point put simply, the CPU is running faster with data calculations then the memory speed latency can keep up with, however the CPU can't call for all the Data and instruction ahead of time very well using prediction to utilize more than the 64bit width of system memory. Think about what I have been explaining, it is the basics of x86 processors. That is why there is little improvement with more memory channels than the single 64bit memory channel.

RAM Performance Benchmark: Single-Channel vs. Dual-Channel - Does It Matter?

http://www.gamersnexus.net/guides/1349-ram-how-dual-channel-works-vs-single-channel/Page-3

Don't complicate the thinking with 4 cores and hierarchy it's just more of the same on a bigger scale.

How Computers Work: Computation (Part II) 64 1 bit adder are chained together to form a 64bit adder.
 

VirtualLarry

No Lifer
Aug 25, 2001
56,453
10,121
126
My point put simply, the CPU is running faster with data calculations then the memory speed latency can keep up with, however the CPU can't call for all the Data and instruction ahead of time very well using prediction to utilize more than the 64bit width of system memory. Think about what I have been explaining, it is the basics of x86 processors. That is why there is little improvement with more memory channels than the single 64bit memory channel.

It depends largely on workload. While it's true that there is probably still more legacy code out there, than SSE/AVX/AVX2 code, that doesn't mean that larger than a 64-bit memory channel is useless. The increase in performance with Synthetic benchmarks can be noticed and measured.

Especially with iGPU graphics performance.
 

Ajay

Lifer
Jan 8, 2001
16,094
8,106
136
Newsflash.

ASML to invest $1B for 25% in Carl Zeiss subsidiary to propel the development of high NA (= numerical aperture) EUV.

The way optics work is that your effective wavelength is physical wavelength divided by the numerical aperture. Immersion lithography has NA=1.35, which is as high as it can get for lithography. It used to be a lot lower, but improved steadily over time, last jump was with immersion lithography from 1 to 1.35 (at 32nm).

Right now, EUV NA is 0.33. It used to be 0.25 a few system iterations ago. Now they want to propel it to >0.5.

Right now 0.4 is the next in the pipeline afaik.

https://www.asml.com/press/press-re...ography-due-in-early-2020s/en/s5869?rid=54430

Edit: And ASML has paused their share buybacks for this. What a great and lofty decision! Intel should also stop wasting their money on these nonsensical costs.

Good play by ASML, IMHO. As to the stock business - sadly, supply manipulation has become a mainstream method for keeping investors happy (and board members, etc.).
 

LTC8K6

Lifer
Mar 10, 2004
28,520
1,575
126
Are you referring to video decode/encode support or something else?
Yes, mostly that.

Kaby Lake was always an optimization of SL though, so I'm not sure why anyone expected a big IPC increase.

There is the Jan 2020 end of support for Skylake with Win7, but I'm not sure anyone cares about that.
 

moonbogg

Lifer
Jan 8, 2011
10,637
3,095
136
Intel even said that it was the same exact CPU core and yet people keep expecting an IPC increase...

If its the same core then where did the Kaby hype come from? I think it was all about the OCability right? CPU's are really putting me to sleep these days. So, how small will they go before a fundamental technology change is necessary? When will this painfully slow rollercoaster finally come to a halt so we can get off this junker?
 

wingman04

Senior member
May 12, 2016
393
12
51
It depends largely on workload. While it's true that there is probably still more legacy code out there, than SSE/AVX/AVX2 code, that doesn't mean that larger than a 64-bit memory channel is useless. The increase in performance with Synthetic benchmarks can be noticed and measured.

Especially with iGPU graphics performance.
I did not say multi channel memory was useless. 64bit CPU-----------64bit CPU< 128bit memory=========128bit, memory Buffering by CL1CL2CL3 and data prediction can only go so far.

What does Intel's extensions have to do with multi channel memory? The technique goes back as far as the 1960s having been used in IBM System/360 Model 91 https://en.wikipedia.org/wiki/Multi-channel_memory_architecture

Synthetic memory benchmarks run the data in and out of the memory through the memory controller, it is meaning less.

It depends largely on workload.
Show me a real life workload multi channel memory makes a significant difference?
 
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Sweepr

Diamond Member
May 12, 2006
5,148
1,142
131
Pentium G4620 Specifications Confirmed - First '4 Threads' Pentium



http://valid.x86.fr/h11znm

At least one Pentium CPU from the Kaby Lake-S family will support HT. Pentium G4620 is essentially a slightly faster Core i3-6100 (+100 MHz). This will put some pressure on competing CPUs, especially if its priced like current Pentium G4520 ($87).

Despite what some users predicted, it's almost 2017 and we still see Intel's 2C/4T CPUs ahead of AMD's FX (Vishera) in the latest blockbuster titles...


Call of Duty: Infinite Warfare CPU Test





http://gamegpu.com/action-/-fps-/-tps/call-of-duty-infinite-warfare-test-gpu
 

jpiniero

Lifer
Oct 1, 2010
14,847
5,457
136
Have to figure that Pentium 4620 is going be closer to $100. Also that would be odd if the i3 7300 was 4.0 Ghz, unless there's a 7100 that's 3.9 Ghz.
 

Justinbaileyman

Golden Member
Aug 17, 2013
1,980
249
106
Wow thats completely crazy... I wasn't even expecting it till late spring, early summer time. New stuffs coming out now in the blink of an eye these days.Would really like to get a 7700k upgrade if they are going to be cheap enough.Are they going to be dropping the TDP a bit on the KabyLake vs Skylake?
 

VirtualLarry

No Lifer
Aug 25, 2001
56,453
10,121
126
Show me a real life workload multi channel memory makes a significant difference?

Some BOINC project tasks are memory-bound. This is extremely visible on Core2-era quad-cores, due to the lack of an IMC, even though they support dual-channel on the chipset memory controller.

If you are looking for synthetics, consider the SPEC "Stream" benchmark, which I have read is primarily a memory-bandwidth benchmark.

Not everything in the computing world is gaming-oriented.
 
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