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  1. #141
    ROG Guru: Yellow Belt Array thebski PC Specs
    thebski PC Specs
    MotherboardAsus Rampage IV Formula
    ProcessorIntel Core i7-3930K
    Memory (part number)CMD16GX3M4A2133C8
    Graphics Card #1EVGA GTX 780 Ti SC
    Sound CardCreative Sound Blaster ZxR
    Monitor3x Asus VG248QE
    Storage #1Samsung 850 Pro 512 GB
    Storage #22x HGST Deskstar 4 TB
    CPU CoolerCorsair H100i
    CaseHAF 932 Advanced
    Power SupplyCorsair AX860
    Keyboard SteelSeries 6GV2
    Mouse Logitech G502
    Headset Beyerdynamic DT990 Pro
    OS Windows 8.1

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    Quote Originally Posted by Spartanjet View Post
    I remember reading in one of the guides there is a way to test but for my Corsair Doms 3200 ver 4.xx is Samsung and 5.xx is Hynix and the 5.xx are hard to get a hold of (but every online reviewer seems to have them).
    So it will vary even on a given part number. That's what I was wondering. Basically there's nothing you can to do ensure you get a certain brand of IC. Thanks.

  2. #142
    ROG Guru: Grand Master Array
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    If the version number for each IC is still valid, you can always ask the online retailer before buying. If you are buying them in store, the version number is on the back of tge box.

  3. #143
    Tech Marketing Manager HQ Array Raja@ASUS's Avatar
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    Quote Originally Posted by WhitePaw View Post
    About the DDR4

    Does anyone know why the channels are clocked different, by default

    just an example>

    CHA/tIOL 8 tRTL 51
    CHB/tIOL 6 tRTL 49
    CHC/tIOL 8 tRTL 51
    CHD/tIOL 6 tRTL 49

    = +/- 0 ??

    This isn't about ddr4 only. What's written below would apply to any external dram architecture; ddr3, ddr4 or otherwise. I won't go too deep, as it's not required. There's a bit more depth in one of the old articles I wrote on AT back in 2010 on this as well.


    The disparity of the values depends on the skew between channels/slots. There will always be some on a board with 8 DIMM slots. The rtl value is based on data arrival time after a request has been sent. The training mechanism values are usually aligned at the most stable/optimal point in the valid timing window.

    In an ideal world we would want the values to be as small as possible. However, there are constraints (physical and architectural) that prevent the value being lower or higher than a given range.

    If the values are manually set to a lower value than set by training, the stability of the system becomes conditional within 1-2 ticks, and will require judicious over-voltage of associated rails to ensure post and pass just a benchmark. That's because we're setting the IMC schedule to expect the first data "packet" sooner and this eats into the guardband (overhead), within the system (which is reduced as we overclock). The operational margin will run out witha one clock change as the system nears its limit as the valid sampling window is smaller. Hence making a reduction in the RTL value will render the IMC to expect the data back sooner than it does and it will either be misread or cause issues for the gearing of the system ( limited due to buffer stack and subsequent sampling of any upstream domain).

  4. #144
    ROG Guru: Platinum Belt Array Rockford's Avatar
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    thanks for the answer....

  5. #145
    ROG Guru: Platinum Belt Array Rockford's Avatar
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    I had to test>

    CHA/tIOL 6 tRTL 49
    CHB/tIOL 6 tRTL 49
    CHC/tIOL 6 tRTL 49
    CHD/tIOL 6 tRTL 49

    = same dram voltages 1,36v

    And it works , but if i understand you right Raja, this could result in instability = data loss, "chipped data"
    Last edited by Rockford; 03-01-2015 at 07:53 PM.

  6. #146
    Tech Marketing Manager HQ Array Raja@ASUS's Avatar
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    Instability is more likely but will depend on the level of stress the system is subjected to and on how hard the bus and memory is being pushed. The harder the system is pushed, the more conditional the stability will be.



    When you move the values you are pulling the sampling forward and at some point it will lose sync. The imc will be set to expect the data before it arrives and the margin for getting away with that depends on how much skew the buffer stack can take before sync is lost.

  7. #147
    ROG Guru: Green Belt Array Avenger411 PC Specs
    Avenger411 PC Specs
    MotherboardAsus Rampage V Extreme
    ProcessorIntel 5930K@4.3Ghz
    Memory (part number)G-Skills DDR4-3200 (16-16-16-36-1T) 1.375v
    Graphics Card #1EVGA Titan X w/ 980 Hybrid AiO Liquid Cooler
    MonitorAsus RoG Swift PG278Q
    Storage #1OCZ RD400A (Windows)
    Storage #2Samsung 950 Pro (Gaming)
    CPU CoolerCorsair H100i
    CaseCorsair 780T
    Power SupplyAntec HCP-1000w Platinum
    Keyboard Corsair K70 Cherry-Mx Brown
    Mouse Logitech G502 Proteus Core
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    Hey!

    just wanted to know real quick if it was normal for the bios post to show my cpu @3.5ghz (5930k) and one line under that, it says 4.25ghz... Also in CPU-Z it says "specification Core i7-5930K @ 3.5ghz" and in core speed says 4250.00mhz. Is this normal or i did something wrong with my overclock ?

    thanks

    Max
    Cpu : Intel 5930K@4.25ghz@1.2v / Cache @4.25ghz@1.20v
    Cpu Cooler : Corsair H100i
    Case : Corsair 780T
    Memory : G.Skills 32GB DDR4-3200mhz CAS 15-15-15-35-1T@1.370v
    Motherboard : Asus Rampage V Extreme (BIOS 3504)
    M2 : Samsung 950 Pro NVME 512gb (Gaming)
    M2 : SSD1 : OCZ RD400A 128gb (windows)
    SSD1 : Crucial MX100 512gb (data)
    Gfx : EVGA Titan X w/ 980 Hybrid Cooling AiO Liquid Cooler
    PSU : Antec HCP-1000W
    Monitor : Asus RoG Swift

  8. #148

  9. #149
    ROG Guru: Green Belt Array Avenger411 PC Specs
    Avenger411 PC Specs
    MotherboardAsus Rampage V Extreme
    ProcessorIntel 5930K@4.3Ghz
    Memory (part number)G-Skills DDR4-3200 (16-16-16-36-1T) 1.375v
    Graphics Card #1EVGA Titan X w/ 980 Hybrid AiO Liquid Cooler
    MonitorAsus RoG Swift PG278Q
    Storage #1OCZ RD400A (Windows)
    Storage #2Samsung 950 Pro (Gaming)
    CPU CoolerCorsair H100i
    CaseCorsair 780T
    Power SupplyAntec HCP-1000w Platinum
    Keyboard Corsair K70 Cherry-Mx Brown
    Mouse Logitech G502 Proteus Core
    Headset Roccat 5.1 True Surround Digital
    Mouse Pad Razer Vespula
    Headset/Speakers Logitech Z906 5.1 Surround
    OS Windows 10 Pro
    Network RouterNetgear Nighthawk AC1900
    Accessory #1 Iphone 6S 64gb
    Accessory #2 Brainwave Headset Stand
    Accessory #3 Microsoft Xbox360 Pc Controller

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    Hey chino!

    How about this 4.375ghz, toying with the oc tonight. I'm actually amazed that i can reach that "realbench stable" at only 1.2v...

    Click image for larger version. 

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    thanks

    Max
    Cpu : Intel 5930K@4.25ghz@1.2v / Cache @4.25ghz@1.20v
    Cpu Cooler : Corsair H100i
    Case : Corsair 780T
    Memory : G.Skills 32GB DDR4-3200mhz CAS 15-15-15-35-1T@1.370v
    Motherboard : Asus Rampage V Extreme (BIOS 3504)
    M2 : Samsung 950 Pro NVME 512gb (Gaming)
    M2 : SSD1 : OCZ RD400A 128gb (windows)
    SSD1 : Crucial MX100 512gb (data)
    Gfx : EVGA Titan X w/ 980 Hybrid Cooling AiO Liquid Cooler
    PSU : Antec HCP-1000W
    Monitor : Asus RoG Swift

  10. #150

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