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Thread: Memory Timings Explained W/ Suggested Timings & Memset VS. BIOS




  1. #91
    Lsdmeasap's Avatar
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    Default Re: Memory Timings Explained W/ Suggested Timings & Memset VS. BIOS

    Thanks for the heads up, updated front page

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    Default Re: Memory Timings Explained W/ Suggested Timings & Memset VS. BIOS

    hey :)

    i've looked in every single hidden dark scary place in my EP45-S3P BIOS and i couldn't find where to set "Refresh Period (tREF)" value which i can change in Memset and i can get pretty good results by doing it.
    Any advices? :) Couse otherwise i have to save Memset and auto-load it on windows boot which is ... Not that it bothers me, but ... you know ... ;)

  3. #93
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    Default Re: Memory Timings Explained W/ Suggested Timings & Memset VS. BIOS

    4G ofg skill pi black 6400(800mhz) are said to do 4-4-4-12 up to 900mhz at 1.8-1.9v,after 900 you have to go to 5 timings and inc vlt 5-5-5-15 at 980mhz 2.06 vlts (.04 vdroop).
    At 1000mhz its 2.22 vlt for me with (2.18 with .04 vdroop).
    They will boot and be stable at both standard and turbo performance.Timings on turbo are better obviously.
    Has anyone any suggestions on this memory/got it working at higher speeds on ep45-ud3?Voltage is about as high as I want to set it.

  4. #94
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    Default Re: Memory Timings Explained W/ Suggested Timings & Memset VS. BIOS

    Quote Originally Posted by opex View Post
    hey :)

    i've looked in every single hidden dark scary place in my EP45-S3P BIOS and i couldn't find where to set "Refresh Period (tREF)" ;)
    I dont know where it is on my ep45 ud3 ,didnt really check.but it should be one of the ones saying auto then when u enter it it has 2 values,3.9 micro sec or 7.8 micro sec that u can pick..Thats what my old GA-73pvm had anyway. ill reboot and check :)
    No cant see it in mine either :(
    Last edited by kick; 02-09-2009 at 03:25 AM.
    Current Systems:

    Asrock p67 Extreme6.............. Gigabyte EP-45 UD3 ...................... Gigabyte 73 PVM S2
    Intel i5 2500k 4.8ghz................ Intel Q8400 3.8ghz......................... Intel D820 2.8ghz
    Zalman 10x cooler.................... Coolermaster V8............................ HP cooler
    8GB Gskill ripjaw ddr3.............. 4GB Gskill PI ddr2.......................... 4GB samsung ddr2
    60GB ssd/500GB HDD .............. WD 1TB hdd.................................... Seagate 160GB hdd
    GTX 460 1GB x2 SLI ................. Msi 9600GT 512MB(died) ........... Onboard gx
    Win7 64 ,750w psu(ocz)............ Win7 64 ,520w psu,seasonic...... Win XP pro ,400w psu

    HEC 6A34 case . ....................... Jeantec R2 case............................ Packard Bell case

    hoping to upgrade to http://www.thinkgeek.com/stuff/41/habicase.shtml
    http://www.flixya.com/video/140325/Animal-launching

  5. #95
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    Default Re: Memory Timings Explained W/ Suggested Timings & Memset VS. BIOS

    tREF is not in the P45 BIOS. You would need to use a P35 board or lesser and flash your SPD if you wanted to change your tREF from what the sticks stock for each SPD is

  6. #96
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    Default Re: Memory Timings Explained W/ Suggested Timings & Memset VS. BIOS

    Quote Originally Posted by Lsdmeasap View Post
    ACT to ACT Delay (tRRD)________ 3-4
    Rank Write to READ Delay (tWTR)_______ (4-6) 9-11 (Note Actual Value set in BIOS Vs. What system Uses will be 7+)
    Write to Precharge Delay (tWR)________ 3-5 (Note Actual Value set in BIOS Vs. What system Uses will be 5+)
    Refresh to ACT Delay (tRFC)___________ 38-42 (2X1GB) 52-62+ (2x2GB)
    Read to Precharge Delay (tRTP)_________ 3-6 (Note Actual Value set in BIOS Vs. What system Uses will be 2+)
    Static tRead Value (tRD)______________ (5/6) 7-10 (800Mhz) 7-12 (1066Mhz)
    Static tRead Phase Adjust________ 1-31*
    Great sticky! Few questions.
    My system is Gigabyte ep45 UD3R
    2x2gb G.Skill 1066 @ 1062 5-5-5-15
    q6600 @ 3.4(425/8)

    On these andvanced settings you noted that settings in () should only be used for benching. Are these settings dangerous for the RAM, or just usualy unstable? Should I get these all as low as possible as long as system is stable?

    I am trying to bench with everest but without changing anything I can run the ram/cache bench and get different results. Like 9001 or 9025 mb/s. This makes it difficult to know if my lower timing is actualy speeding things up or just moving me closer to instability. Any insight into which should be lowered and which don't really need to be would be great.

    Should I set my command rate? Or leave on auto?

    I test stability with memtest86+ and OCCT large data sets.

    Here is where I am at. System is stable atm :)
    q6600 G0 1.275vid @ 3.6 / AC Freezer 7 pro
    Gigabyte UD3R
    2x2gb G.Skill 1066
    MSi 4870 1g (839/995)
    Antec 650w
    Antec 900

  7. #97
    Lsdmeasap's Avatar
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    Default Re: Memory Timings Explained W/ Suggested Timings & Memset VS. BIOS

    Those settings are just a general starting point, for "Most" DDR2 memory. Some will of course need higher and some will be fine with lower. They are also noted out with the 333 strap in mind, and the normal amounts and speeds of memory that are often used (800/1066 ~ 2-4GB)

    The ones in () may work fine with Many memory, for everyday use. It all depends on the memory, the board, the actual memory speeds, MCH/NB Strap in use, Trd (Static tRead Value), and voltages applied.

    Most of the time yes, lower is best as long as you are stable. Again those I posted in the guide are meant only as a starting point for users in most situations to get going.

    And yes, some settings to low may be stable but may also hinder performance so you have to watch what you set on the low side.

    Getting different results like this >>> 9001 or 9025 mb/s Can happen anytime, with the same settings. That is a very small difference and your system may have been doing something in the background on one of them, or not on the other, that would affect scores in that small manner

    Command rate setting will not work in P45, so you should set it to the default it uses anyway of 2.

    tWR and tWTR May be able to come down a bit for you, all depends on what you are setting in the BIOS, what strap/multi you are using, and what voltages you are using. But the rest looks good and lower on any others may cause instability or affect performance. You can also however try tRD of 6 and see if it will boot for you, but that largely depends on voltages and memory multi in use

  8. #98
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    Default Re: Memory Timings Explained W/ Suggested Timings & Memset VS. BIOS

    Quote Originally Posted by Lsdmeasap View Post
    tWR and tWTR May be able to come down a bit for you, all depends on what you are setting in the BIOS, what strap/multi you are using, and what voltages you are using. But the rest looks good and lower on any others may cause instability or affect performance. You can also however try tRD of 6 and see if it will boot for you, but that largely depends on voltages and memory multi in use
    Thanks for the response! A tRD of 6 crashed me, no post. I guess 7 is my lucky number . Here is my Bios atm. Ram timings are still a work in progress. sig rig at 3.4, I go 3.6 for benching and winter.

    MB Intelligent Tweaker(M.I.T.)
    Robust Graphics Booster ...............: Auto
    CPU Clock Ratio ..........................: 8
    CPU Frequency ...........................: 3400
    Clock Chip Control
    Standard Clock Control
    CPU Host Clock Control..................: [Enabled]
    CPU Host Frequency (Mhz) ............: 425 Mhz
    PCI Express Frequency (Mhz) .........:100
    C.I.A.2 .................................:[Disabled]
    Advanced Clock Control [Press Enter]
    CPU Clock Drive...........................: 800 mv
    PCI Express Clock Drive.................: 900mv
    CPU Clock Skew (ps)....................: 0 ps
    MCH Clock Skew (ps)...................: 0 ps
    DRAM Performance Control
    Performance Enhance...................: [STANDARD]
    Extreme Memory Profile (X.M.P.).....: Disabled
    (G)MCH Frequency Latch...............: 266
    System Memory Multiplier ..............: 2.50A
    Memory Frequency (Mhz) ..............: 1063
    DRAM Timing Selectable ................: [Manual]
    Standard Timing Control
    CAS Latency Time........................ 5
    tRCD ......................................... 5
    tRP'........................................... 5
    tRAS.......................................... 15
    Advanced Timing Control
    tRRD........................................... 3
    tWTR.......................................... 4
    tWR............................................ 5
    tRFC...........................................50
    tRTP........................................... 3
    Command Rate (CMD) ....................: auto
    Driving Strength Profiles
    Driving Strength ............................1066
    Channel A
    Static tRead Value.........................:7
    tRD Phase0 Adjustment...................:<<< Leave for all below as well
    tRD Phase1 Adjustment...................:Auto
    tRD Phase2 Adjustment .................:Auto
    tRD Phase3 Adjustment..................:Auto
    Trd2rd(Different Rank)....................:Auto
    Twr2wr(Different Rank)...................:Auto
    Twr2rd(Different Rank)...................:Auto
    Trd2wr(Same/Diff Rank)..................:Auto
    Dimm1 Clock Skew Control...............:Auto ps
    Dimm2 Clock Skew Control...............:Auto ps
    Channel B
    Static tRead Value.........................:7
    tRD Phase0 Adjustment...................:<<< Leave for all below as well
    tRD Phase1 Adjustment...................:Auto
    tRD Phase2 Adjustment .................:Auto
    tRD Phase3 Adjustment..................:Auto
    Trd2rd(Different Rank)....................:Auto
    Twr2wr(Different Rank)...................:Auto
    Twr2rd(Different Rank)...................:Auto
    Trd2wr(Same/Diff Rank)..................:Auto
    Dimm1 Clock Skew Control...............:Auto ps
    Dimm2 Clock Skew Control...............:Auto ps
    Motherboard Voltage Control
    Voltage Type.………... Manual
    CPU
    CPU Vcore….……….........................: 1.3125
    CPU Termination…..... 1.200V*.......: 1.24
    CPU PLL…………………....1.500V*.......: 1.5
    CPU Referen.…………....0.755V*.......: 0.78
    MCH/ICH
    MCH Core…………….....1.100V...........: 1.3
    MCH Reference….…….0.800V...........; 0.825
    MCH/DRAM Ref.…......0.900V...........: AUTO
    ICH I/O……………….....1.550V............: 1.5
    ICH Core…………...……1.100V............: 1.1
    DRAM
    DRAM Voltage ……....1.800V............: 2.0
    DRAM Termination .…0.900V............: AUTO
    Channel A Reference 0.900V............: AUTO
    Channel B Reference 0.900V............: AUTO
    Advanced Settings
    Limit CPUID Max. to 3.....................: [Disabled]
    No-Execute Memory Protect............: [enabled]
    CPU Enhanced Halt (C1E)................: [Disabled]
    C2/C2E State Support....................: [Disabled]
    x C4/C4E State Support..................: [Disabled]
    CPU Thermal Monitor 2(TM2) ...........: [enabled]
    CPU EIST Function.........................: [Disabled]
    Virtualization Technology................: [Disabled]
    q6600 G0 1.275vid @ 3.6 / AC Freezer 7 pro
    Gigabyte UD3R
    2x2gb G.Skill 1066
    MSi 4870 1g (839/995)
    Antec 650w
    Antec 900

  9. #99
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    Default Re: Memory Timings Explained W/ Suggested Timings & Memset VS. BIOS

    Ya, 6 may not work unless you try more/less Vtt/MCH/Ram voltage, and possibly you may have to loosen up other timings first. It should work though since you are using the A multi, I have used as low as 4-5 on B

  10. #100
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    Default Re: Memory Timings Explained W/ Suggested Timings & Memset VS. BIOS

    I have 4GB of RAM (4 x 1GB DDR2 667MHz) and my system (MA790FX-DS5) is running stable. Why do I need to increase DDR voltage?

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