Intel's 8th Generation Core Family - Coffee Lake (LGA 1151, 6C/12T)

Discussion in 'Intel Processors' started by -Sweeper_, Apr 19, 2017.

Where do you expect Core i7-8700K's Turbo to land?

Poll closed Jul 25, 2017.
  1. 3.8/3.9 GHz

    0 vote(s)
    0.0%
  2. 4.0/4.1 GHz

    3 vote(s)
    23.1%
  3. 4.2/4.3 GHz

    6 vote(s)
    46.2%
  4. 4.4/4.5 GHz

    3 vote(s)
    23.1%
  5. 4.6/4.7 GHz

    1 vote(s)
    7.7%
  1. brentsg

    brentsg [H]ard|Gawd

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    Don't forget Ebates gives 3% cash back at Newegg! That's almost $19 more off that combo.
     
  2. amd7674

    amd7674 [H]ard|Gawd

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    I believe extreme4 and Taichi share the same audio chipset. Since I don't need wifi, I might go for K6.
     
  3. amd7674

    amd7674 [H]ard|Gawd

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    Great :) ... So it looks like there is a silicon lottery for asrock K6... how do I win it? is there anything on the package telling me what I should be getting?
     
  4. SimianRob

    SimianRob n00bie

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    It's more that I just don't think its entirely accurate to say its a 5ghz overclock if in the most demanding situations its actually running at 4.8ghz (and as I said, a lot of games that aren't even that demanding but trigger AVX instructions thus the throttling). I'm more than happy that my CPU can run all cores/threads at 4.8ghz under any situation, just took a delid, watercooling and lots of voltage to get there. Which is why I roll my eyes when I see people claiming huge overclocks with equivalently huge avx offsets, just feels like it defeats the purpose a bit.
     
  5. Communism

    Communism Limp Gawd

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    People always lie about OCs, it's simply how it goes.

    However, this also extends to people's lies about OCs on previous chips.

    14nm++ improvements are real.
     
  6. TaintedSquirrel

    TaintedSquirrel [H]ardForum Junkie

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    SL's coffee lake ocs are about 100 MHz higher than their 7700K's at the same vcore. Not bad at all.
     
  7. FlamingKomodo

    FlamingKomodo n00bie

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    Report In. How went your Silicon Lottery endeavour.
     
  8. TahoeDust

    TahoeDust Limp Gawd

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    Why would you want to run "4.8GHz under any situation" when you could run 5GHz with a -2 AVX offset at most likely the same temps and voltage? Just so you can feel better about saying what your overclock is without having to specify an offset?

    Get used to people using AVX offsets in their overclocks. It is there for s reason. As core numbers increase it becomes more necessary. x299 can really become a fireball without it.
     
  9. SimianRob

    SimianRob n00bie

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    There's nothing wrong with using avx offsets, but I overclock to get better performance in situations that actually demand it, meaning CPU intensive applications or gaming (ones that probably use AVX instructions anyway), not to feel good about loading up Firefox or notepad faster at 5ghz. If more applications than not are triggering the AVX downclock it starts to feel counter intuitive to run these insanely high overclocks with avx offsets and claim 5-5.2ghz. All I was saying is that the overclocks look huge on paper but what they're really saying when they say "5ghz overclock with -2 avx offset" is "5ghz but not in this, this, this or this and this".
     
  10. Hagrid

    Hagrid Kyle's Boo

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    Yeah, not much difference between 5 and the 4.8. Maybe it's more epeen. I did not even try for higher on my 5960x. It runs everything just fine.
     
  11. TahoeDust

    TahoeDust Limp Gawd

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    I think you may be overestimating the amount of "CPU intensive application" and games trigger the AVX offset. I rarely see my AVX offset kick in except for when encoding. I play a lot of AAA gaming titles and if I ever see it kick in, it is almost always briefly.

    I understand exactly what you are saying, and I had the same thoughts when overclocking my 7820x. I kind of felt like I was cheating. In the end after a few months of use, I can see that my machine certainly does not use AVX as often as it doesn't...and I didn't build it to play mindsweaper. If I overclocked to the lowest common denominator, AVX-512 in my case, I would be leaving a ton of performance on the table.
     
    Last edited: Nov 14, 2017
  12. SimianRob

    SimianRob n00bie

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    The AVX offset was kicking in under both PUBG and Heroes of the storm which I've been playing a lot of lately, I'm admittedly more GPU bound anyway since I'm using a 1080 (non-ti) but I did find it annoying since neither of these games were going to turn my system into a fireball like Prime95 would.
     
  13. Frito11

    Frito11 Limp Gawd

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    not to mention things optimized to use AVX heavily that require the offset are worlds faster due to AVX and AVX-512, take encoding for example, 4.5 ghz avx-512 encoding absolutely rips and the benefits far out weigh the reduced clocks to make it possible.
     
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  14. TahoeDust

    TahoeDust Limp Gawd

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    Hmmm...I play PUBG also. I don't remember how much it actually kicks in. Maybe I will log my clocks and see how often the AVX offset is kicking in.

    Edit: I read yesterday that there may be a bios issue on z270 boards falsely triggering the offset. I dismissed it, but this may be correct. I just tested PUBG and I am deffinitely not seeing the offset kick in except very rarely.
     
    Last edited: Nov 14, 2017
  15. TahoeDust

    TahoeDust Limp Gawd

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    See my post above about there possibly being a bios issue.

    Here is my machine running PUBG. Sorry for the "amateur hour" video, but it was the easiest way for me to share what I am seeing. When I am showing my performance statistics, you can see that the CPU is more or less locked at 4.8GHz on all 8 cores. My current overclock is 4.8GHz with a -5 AVX offset. You can see it goes to 4.2GHz for a second at ~0:13...something must be briefly triggering the offset.

    If you are seeing your offset kicking more often, something else is amiss.

     
  16. SimianRob

    SimianRob n00bie

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    Interesting. I'll have to try it again and see if the offset is kicking in consistently or not, it was when I last tested but I'll try again soon and see what's up.
     
  17. Wysockisauce

    Wysockisauce n00bie

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    Built my Coffee Lake rig over the weekend.

    8700k (Batch L730C348) (No-Delid)
    Thermaltake Floe 360 AIO
    Maximus X Hero Wifi AC
    32 gb Trident Z RGB 3600 c17

    My bios settings are as follows:

    AI OC Tuner: XMP
    ASUS MCE: Disabled
    SVID Behavior: Auto
    AVX Negative Offset: 0
    CPU Core Ratio: Sync All Cores
    1-Core Ratio Limit: 48
    CPU SVID Support: Auto

    CPU LLC: Level 6

    Long Duration Package Power Limit: 4095
    Short Duration Package Power Limit: 4095
    IA AC Load Line: .01
    IA DC Load Line: .01

    CPU Core/Cache Current Limit Max: 255.5

    CPU Core/Cache Voltage: Adaptive Mode
    Offset Mode Sign: -
    Additional Turbo Mode Cpu Core Voltage: 1.30
    Offset Voltage: .02
    CPU VCCIO Voltage: 1.15
    CPU System Agent Voltage: 1.2

    No crashes or errors in OCCT, Real Bench or Cinema Bench. No Event Viewer errors. HW Monitor shows core at 1.3v Temps top out at 85c. 5Ghz wasnt stable at 1.4v and I don't have the balls/cooling to take it any higher and delid.

    Going by what people are posting online, these are pretty underwhelming results.
     
  18. Frito11

    Frito11 Limp Gawd

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    I mean 1.3v 4.8 ghz? thats great if you want 5+ ghz you need more voltage and due to it being a 6 core that means delid and good cooling. if these cpu's could do 5 ghz out the box they'd ship them to do that you need to be able to cool the beast to put the voltage to it to make it possible.
     
  19. tangoseal

    tangoseal [H]ardness Supreme

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    Why did you choose that name?
     
  20. Shintai

    Shintai [H]ardness Supreme

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    Reminds me of all SB chips doing 5Ghz BS ;)
     
  21. ZeqOBpf6

    ZeqOBpf6 Limp Gawd

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    Can someone give me a brief explanation of what this AVX stuff is? I'm gathering it's something about using a higher frequency in certain situations? Google's explanations were uh, not user friendly.
     
  22. Shintai

    Shintai [H]ardness Supreme

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    Its vector instructions. They can run at up to 512bit. AVX2 runs at 256bit.
     
  23. TaintedSquirrel

    TaintedSquirrel [H]ardForum Junkie

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  24. Shintai

    Shintai [H]ardness Supreme

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  25. juanrga

    juanrga [H]ard|Gawd

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    Consider you have to obtain the total monthly sales of four stores.

    In the first approach you do all the work in a serial way. First get S1 sales, then S2 sales,...

    scalar approach
    Code:
              you
    day 1 --> S1
    day 2 --> S2
    day 3 --> S3
    day 4 --> S4
    
    In a second approach you get the help of three friends and all you work together, with each one of you working in the data of a single store.

    vector approach
    Code:
              you  1st-friend  2nd-friend  3rd-friend
    day 1 --> S1   S2          S3          S4
    
    Something similar happens with x86 vs AVX.

    x86 is scalar architecture. It defines operations apply to one datum at one time. The general acronym is SISD (Single Instruction on Single Data). AVX is SIMD architecture. It defines operations that apply to multiple data at one time. SIMD = Single Instruction on Multiple Data. With AVX instructions a CPU can do more work in the same time, because increases the degree of parallelism.

    [​IMG]
     
    Last edited: Nov 15, 2017
  26. TaintedSquirrel

    TaintedSquirrel [H]ardForum Junkie

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  27. EvilViking

    EvilViking I Drank All Your Beer

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    Recommendations on a mobo? I bought an Asus Z370-F Gaming but I'm thinking I may be better off with an Asrock K6 or Gigabyte Gaming 7.
     
  28. luke51087

    luke51087 2[H]4U

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    you looking at any specific features? I am loving my gigabyte gaming 7, solid with the all core 4.7 i havent tried much more but i do like the look of it, and i use 2 nvme in raid 0 and a sata m2 so i kinda need 3m.2.

    Also using 4x8gb trident z rgb at 3200 14-14-14-34 with no issues and it fits my kraken x62(just barely) the tubing touches slot one
     
  29. TaintedSquirrel

    TaintedSquirrel [H]ardForum Junkie

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    Gaming M5, Taichi, Gaming 7, depending on how much you want to spend.
    The Gaming 7 was $199 last week.
     
  30. EvilViking

    EvilViking I Drank All Your Beer

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    No Asus. This is what I'm saying! Haha.

    I don't care about built in wifi or on board sound. I care about a good warranty/support. The highest overclock "features" available. ie: decent vrm cooling, power distribution, etc.
     
  31. TaintedSquirrel

    TaintedSquirrel [H]ardForum Junkie

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  32. Speedeu4ia

    Speedeu4ia [H]Lite

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  33. TahoeDust

    TahoeDust Limp Gawd

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    Does the Asus z370 bios allow you to control each core's voltage individually? This is an option on their x299 boards.
     
  34. maverick786us

    maverick786us [H]ard|Gawd

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    There is no review of Coffee lake 8700K in our hard forum yet?
     
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  35. oleNBR

    oleNBR Limp Gawd

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    iirc avx use a ton of memory bandwidth and with just dual channel it seems hitting the limit, going to avx2 prob will see some improvement but prob not much if stayed on dual channel. with 8 cores and avx512 we will need at least 4-6 channel of memory to full take advantage of that $h!t which is why skylake-x was so appealing but then the junk mesh clock ruined it at only 3300mhz max. if it can do over 4000mhz on mesh totally worth it.

    missed SL's 8700k sale by like less than 1 min literally all sold out on checkout page, when is 8 core CFL or icelake coming, 8 core 10nm+ would be nice.
     
  36. Shintai

    Shintai [H]ardness Supreme

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    It uses a ton of cache bandwidth yes. Not so much system.

    EPYC loses massively to SKL for the same reason. 3x perf delta. EPYC sales are counted in a couple of 100 units because of bugs and because AMD went cheap on AVX support.
     
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  37. oleNBR

    oleNBR Limp Gawd

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    how credible is this source this person getting from?
     
  38. Shintai

    Shintai [H]ardness Supreme

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    In what terms? The performance numbers? Spot on. For the other part you can lookup AMDs Q3 statements.
     
  39. Factum

    Factum Gawd

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    We use some of those vendors (the big ones) and I have posted before that they have nothing with AMD CPU's on their roadmaps so far...the info sounds very credible to me.
    It's sad when reality and forums/PR are so far apart...when you read the forums/PR you get the impression that Intel is under pressure...when I look at our datacenters...I see nothing but Intel CPU's *shrugs*
     
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  40. amd7674

    amd7674 [H]ard|Gawd

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    I pulled the trigger and I've ordered:

    - 8700k
    - gigabyte gaming 7
    - gskill ripjaws V ddr4 16gb 3200 14CL
    - Seasonic 850w Focus Gold PSU
    - Samsung 960 Evo 250gb NVMe
    - noctua d15

    This will go into my old trusty HAF 922. No more excuses for GTX1070 ;-) This should be good upgrade from 3570k@4.5

    I will report back once the system is up and running in a week or two. ;)


    Based on what I've read I would go with Gaming 7 (best VRM out of the 3). For Asrock K6 or Taichi there is fets lottery and you might get either fairchild & sinopower. (You want fairchild).
    I was deciding between Asus Hero X and Gaming 7, both with great VRM sets for overclocking. I went with Gaming due to the cheaper price.
     
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