Page 1 of 3 1 2 3 LastLast
Results 1 to 10 of 30
  1. #1
    Super Moderator Array
    Join Date
    Jul 2011
    Reputation
    94
    Posts
    725

    DRAM Ratio Confusion

    Just to clarify the confusion with straps, base clk and dram frequencies

    the only real difference these 3 variables make is in the one variable that actually matters, the DRAM Ratio used.

    Up to the 24x which is typically called the 2400 dram ratio, ALL ratios equal or below 24x work equally good at overclocking the DRAM. (that would mean 2400 ratio, 2200 ratios so on)

    ALL 100-based ratios > 24x (aka 2600 ratio, 2800ratio, 3000ratio, so on) are NOT good for overclocking, 2600 ratio may boot at 2600dram freq - you may get to 2800 with it but not much more.

    30x ratio aka 3000 ratio, gets to 3000 and not much more.

    26.66x aka 2666 dram ratio is 133-based but strangely not as good for overclocking - you may get to 2800 with it but not much more.

    29.33x aka 2933 ratio seems better than 2666, 3000 seems within reach with it.

    32x aka 3200 ratio works good, on par with 24x and below ratios. as an example if i can get 3400 with 24x/below ratios i can be sure 3200 ratio can get the same AS LONG AS PEG/DMI target frequencies is not out of the somewhat limited +/- 5% range.

    34x aka 3400 ratio sux, doesnt work well.

    Therefore recognize that there is nothing magical about straps or baseclk in relevance to dram frequencies but seperate the 'good' dram ratios from the bad

    good: 24x and below + 32x
    bad: 26x, 28x, 30x
    Barely decent: 26.66x, 29.33x
    Last edited by Shamino; 09-11-2014 at 03:28 AM.

  2. #2
    ROG Guru: Grand Master Array Arne Saknussemm PC Specs
    Arne Saknussemm PC Specs
    Laptop (Model)Laptop?...No way! (Model?...Jun Amaki...yes way!)
    MotherboardROG ZENITH II EXTREME
    ProcessorTHREADRIPPER 3960X
    Memory (part number)TXBD48G4000HC18FBK
    Graphics Card #1GTX Titan X
    Graphics Card #2SLI is dead to me
    Graphics Card #3Tri SLI is even dead to Nvidia
    Graphics Card #4Quad SLI is dead to everybody especially my credit card
    Sound CardXonar Essence STX
    MonitorASUS ROG Swift PG279Q
    Storage #1Samsung 970/960/950 PRO
    Storage #22x OCZ VERTEX 3/2x WD Caviar Black 500GB / 2x WD RED 2TB/Samsung 1TBSSDs
    CPU CoolerCustom Loop: Dual D5s, Dual Alphacool Monsta 480s, XSPC Raystorm Neo TR4, EK TitanX WaterBlock
    CaseNope!...Dimastech Easy XL...let it all hang out man!
    Power SupplySeasonic 1000 Platinum
    Keyboard Corsair Strafe MK2 ROG Claymore... or Fender Rhodes Electric Piano (MKI 73)
    Mouse Corsair M65Pro or Speedy Gonzalez...not Mickey...don't do Disney!
    Headset ...firmly on neck
    Mouse Pad Mouse don't got his own pad man...lives with me
    Headset/Speakers Edifier Spinnaker...or you mean the speakers in my head...man too many voices to name them all
    OS Win XP, 7, 8, 8.1 and Windows 10 Spyware Edition
    Network Router56k modem
    Accessory #1 Umm...nice tie?
    Accessory #2 Err...belt?
    Accessory #3 3 accessories?! I'm not a girl!!
    Arne Saknussemm's Avatar
    Join Date
    Apr 2012
    Reputation
    505
    Posts
    13,682

    Shamino bless you I'm sure that's diamond but I'm not sure I understand it

    Does that mean I'm better off buying 3200 kit than 3000?

    Or that 3000 at 125 bclk is 24 ratio so good...?
    Last edited by Arne Saknussemm; 09-10-2014 at 04:15 PM.

  3. #3
    Tech Marketing Manager HQ Array Raja@ASUS's Avatar
    Join Date
    Apr 2011
    Reputation
    164
    Posts
    7,454

    No - you just run whatever combination of strap and BCLK you need to get either frequency stable.

    The "bad" dividers are still "bad", by moving the strap you just end up with the right frequency is all. The strap offset just gets you some of those DRAM kit frequencies that the direct 100 ratios cannot hold stable. Overall you're still running the same "lower and good" divider. You could in fact do it by BCLK with the 100 strap on a good ratio (as per shammy's post).

  4. #4
    AntiMatter Guru ROG Array chrsplmr's Avatar
    Join Date
    Jul 2011
    Reputation
    295
    Posts
    6,113

    Threads like this is what I live for .. ROGbits ... thanks guys. .c.
    Last edited by chrsplmr; 09-11-2014 at 02:11 AM.

  5. #5
    ROG Guru: Brown Belt Array tistou77 PC Specs
    tistou77 PC Specs
    MotherboardRampage VI Extreme Encore
    Processor10980XE @4.6Ghz
    Memory (part number)G.Skill Trident Z RGB Royal 4x8Gb @4000 C16
    Graphics Card #1EVGA RTX 2080ti XC Ultra
    Sound CardXonar Phoebus
    MonitorDell U2417H
    Storage #1Intel Optane 905P PCIe
    Storage #2Samsung 970 EVO Plus
    CPU CoolerWatercooling
    CaseLian Li A77F
    Power SupplySeasonic Prime Ultra Titanium 1000W
    Keyboard Logitech LIK
    Mouse Logitech MX revolution
    OS Windows 10 Pro x64
    tistou77's Avatar
    Join Date
    Apr 2012
    Reputation
    103
    Posts
    1,621

    Thank you for these explanations, although I don't understand everything, with my bad English
    Last edited by tistou77; 09-11-2014 at 12:13 PM.
    Sorry for my english


    Case: Lian Li A77F
    MB: Rampage VI Extreme Encore
    CPU: i9 10980XE
    RAM: G.Skill Trident Z RGB Royal 4x8Gb @4000 C16
    GPU: EVGA RTX 2080ti XC Ultra
    PSU: Seasonic Prime Ultra Titanium 1000W
    OS: Intel Optane 905P PCIe
    DATA: Samsung 970 EVO Plus
    SOUND: Asus Xonar Phoebus

  6. #6
    imMortal Kombatant Array Myk SilentShadow PC Specs
    Myk SilentShadow PC Specs
    MotherboardASUS Rampage IV Formula
    ProcessorIntel i7 3930K
    Memory (part number)8GB Corsair XMS3 1600
    Graphics Card #1ASUS Radeon 7970 3GD5
    Sound CardROG Xonar Phoebus
    MonitorSamsung SyncMaster SA300
    Storage #1Corsair Neutron 128GB
    Storage #2Seagate 2TB
    CPU CoolerCorsair A50 Pro Air Cooler
    CaseBitFenix Merc Alpha
    Power SupplyThermaltake Litepower 700W
    Keyboard Alienware TactX Keyboard
    Mouse Tesoro Gandiva H1L
    OS Win7 Ultimate x64
    Myk SilentShadow's Avatar
    Join Date
    Jan 2012
    Reputation
    266
    Posts
    5,241

    Quote Originally Posted by tistou77 View Post
    Thank you for these explanations, although I don't understand everything, with my bad English
    Don't feel too bad mate, English is my native language and I have no bloody clue what the hell he's talking about

  7. #7
    Tech Marketing Manager HQ Array Raja@ASUS's Avatar
    Join Date
    Apr 2011
    Reputation
    164
    Posts
    7,454

    Its easy Myk. I don't have time to do the whole lot for you but here goes.

    Look at what happens to DRAM frequency when you change the strap - the same divider is used. Offsetting the BCLK increases the frequency on the same DRAM ratio!

    2400 on 100 strap becomes DDR4-3000 on 125 strap
    2133 on 100 strap becomes DDR4-2666 on 125 strap

    such ratios are GOOD.


    You can apply this to the bad ratios on 100 and find out which frequencies are bad on 125. Look at shammy's post and try it out.


    Do this. Set 100 Strap. Select the 2400 ratio. Type in 125 BCLK in the bclk setting. See what it becomes? DDR4-3000. When you go to the 125 strap thats all that happens. We know the 2400 ratio is a good ratio. There for DDR4-3000 on the 125 strap is stable also.


    Now if this post does not give you any more insight or idea, I need to find a new job and you guys need to find a new hobby!

  8. #8
    ROG Guru: Brown Belt Array tistou77 PC Specs
    tistou77 PC Specs
    MotherboardRampage VI Extreme Encore
    Processor10980XE @4.6Ghz
    Memory (part number)G.Skill Trident Z RGB Royal 4x8Gb @4000 C16
    Graphics Card #1EVGA RTX 2080ti XC Ultra
    Sound CardXonar Phoebus
    MonitorDell U2417H
    Storage #1Intel Optane 905P PCIe
    Storage #2Samsung 970 EVO Plus
    CPU CoolerWatercooling
    CaseLian Li A77F
    Power SupplySeasonic Prime Ultra Titanium 1000W
    Keyboard Logitech LIK
    Mouse Logitech MX revolution
    OS Windows 10 Pro x64
    tistou77's Avatar
    Join Date
    Apr 2012
    Reputation
    103
    Posts
    1,621

    If I understand (with my poor English )

    The where is confusing is that I have to mix the strap and BCLK, I think
    With X79, I touch only BCLK and DRAM Frequency (Strap = Auto)

    Must begin with Strap (BCLK?) 100 and DDR4-2400.
    If I would have DDR4-3000, I go up the Strap (BCLK?) to 125?
    For DDR4-2800 for example, I have to start 100 BCLK and mount the BCLK until reaching DDR4-2800?

    And will 116.6 BCLK (ratio x24)
    Is good or not?

    Sorry if I didn't understand
    Last edited by tistou77; 09-11-2014 at 03:30 PM.
    Sorry for my english


    Case: Lian Li A77F
    MB: Rampage VI Extreme Encore
    CPU: i9 10980XE
    RAM: G.Skill Trident Z RGB Royal 4x8Gb @4000 C16
    GPU: EVGA RTX 2080ti XC Ultra
    PSU: Seasonic Prime Ultra Titanium 1000W
    OS: Intel Optane 905P PCIe
    DATA: Samsung 970 EVO Plus
    SOUND: Asus Xonar Phoebus

  9. #9
    Tech Marketing Manager HQ Array Raja@ASUS's Avatar
    Join Date
    Apr 2011
    Reputation
    164
    Posts
    7,454

    Quote Originally Posted by tistou77 View Post
    If I understand (with my poor English )

    The where is confusing is that I have to mix the strap and BCLK, I think
    With X79, I touch only BCLK and DRAM Frequency (Strap = Auto)

    Must begin with Strap (BCLK?) 100 and DDR4-2400.
    If I would have DDR4-3000, I go up the Strap (BCLK?) to 125?
    For DDR4-2800 for example, I have to start 100 BCLK and mount the BCLK until reaching DDR4-2800?
    You can try 100 strap with DDR4-3000. If not stable then use 125 strap and try DDR4-3000.

    For DDR4-2800 you can try 100 strap 2666 or 2933 with +/- BCLK.

    Or you can use 125 strap and nearest frequency and +/- BCLK to get 2800.

  10. #10
    ROG Guru: Brown Belt Array tistou77 PC Specs
    tistou77 PC Specs
    MotherboardRampage VI Extreme Encore
    Processor10980XE @4.6Ghz
    Memory (part number)G.Skill Trident Z RGB Royal 4x8Gb @4000 C16
    Graphics Card #1EVGA RTX 2080ti XC Ultra
    Sound CardXonar Phoebus
    MonitorDell U2417H
    Storage #1Intel Optane 905P PCIe
    Storage #2Samsung 970 EVO Plus
    CPU CoolerWatercooling
    CaseLian Li A77F
    Power SupplySeasonic Prime Ultra Titanium 1000W
    Keyboard Logitech LIK
    Mouse Logitech MX revolution
    OS Windows 10 Pro x64
    tistou77's Avatar
    Join Date
    Apr 2012
    Reputation
    103
    Posts
    1,621

    Ok thank you I will test
    Sorry for my english


    Case: Lian Li A77F
    MB: Rampage VI Extreme Encore
    CPU: i9 10980XE
    RAM: G.Skill Trident Z RGB Royal 4x8Gb @4000 C16
    GPU: EVGA RTX 2080ti XC Ultra
    PSU: Seasonic Prime Ultra Titanium 1000W
    OS: Intel Optane 905P PCIe
    DATA: Samsung 970 EVO Plus
    SOUND: Asus Xonar Phoebus

Page 1 of 3 1 2 3 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •