Please report all spam threads, posts and suspicious members. We receive spam notifications and will take immediate action!
Page 1 of 2 12 LastLast
Results 1 to 10 of 12

Thread: P35-DS3L memory multiplier issue




  1. #1
    Join Date
    Mar 2008
    Posts
    12

    Default P35-DS3L memory multiplier issue

    Just putting together my system, it's only running in bios off a floppy to setup the cpu and memory overclocks. I have a strange inconsistency or maybe I'm just not understanding something. When I set a memory multiplier of 3.33 I can run through memtest86+ just fine, when the only change I make is lowering it to 3.2, it won't even boot. I went into the advanced memory settings and set them manually so they would not change automatically but same result.

    Any ideas for me to try? This is not a big issue but I'd just like to understand why, I must be missing something.

    Q6600 @ 3.0g, 334 x 9
    2g Corsair pc8500 5-5-5-15 @ 1112 (3.33)
    F7 bios
    rev2.0

    Thanks

    (btw, the board is awesome, incredible value!)

  2. #2
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
    Join Date
    Jan 2008
    Location
    PCB Island
    Posts
    25,940

    Default Re: P35-DS3L memory multiplier issue

    Too tight of subtimings maybe or not enough volts to mch or memory itself. Have you read thru the guide I posted?

    If not have a look at that and see if it helps

    If that doesnt get you anywhere, copy/paste this back to me with your info +/- any info >>>
    Robust Graphics Booster___________ [Auto]
    CPU Clock Ratio ____________ [XX]
    CPU Host Clock Control_ [Enabled]
    CPU Host Frequency (MHz)__________ [266]
    PCI Express Frequency (Mhz)_______ [102]
    C.I.A. 2__________________________ [Disabled]
    System Memory Multiplier (SPD)____ [2.00]
    DRAM Timing Selectable_______ SPD __ [Manual]

    CAS Latency Time_____________ 5 ____ ?
    Dram RAS# to CAS# Delay______ 5 ____ ?
    Dram RAS# Precharge Delay_____5 ____?
    Precharge Delay (tRAS)________15 ____ ?
    ACT to ACT Delay (tRRD)_______4 _____ ?
    Rank Write to READ Delay______3 _____ ?
    Write to Precharge Delay______6 _____ ?
    Refresh to ACT Delay________42 ______ ?
    Read to Precharge Delay_______4 _____ ?
    Static tRead Value_______________ 1-31
    Static tRead Phase Adjust________ 1-31

    System Voltage Control____ [Manual]
    DDR2 OverVoltage Control__ [+0.300V]
    PCI-E OverVoltage Control_ [+0.1V]
    FSB OverVoltage Control___ [+0.1V]
    (G)MCH OverVoltage Control [+0.1V]
    CPU Voltage Control_______ [1.25]

  3. #3
    Join Date
    Mar 2008
    Posts
    12

    Default Re: P35-DS3L memory multiplier issue

    Thanks for the reply,

    I cruised through your excellent guide, I'll get you specific values by tomorrow.

    Like I said though I have values that pass and are stable. I then effectively underclock relative to them and it won't boot?

    Thanks again

  4. #4
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
    Join Date
    Jan 2008
    Location
    PCB Island
    Posts
    25,940

    Default Re: P35-DS3L memory multiplier issue

    Ahh well yeah post back when you can.

    Underclocking leads to instability then? Hmm maybe you need less volts on something or your underclock settings still need a small adjustment

  5. #5
    Join Date
    Mar 2008
    Posts
    12

    Default Re: P35-DS3L memory multiplier issue

    After spending way too much time on the web :) I think I know where the problem is coming from, the strapping settings.

    I don't understand how the strapping settings are supposed to be used in the bios. It looks like they are tied to the 4x multiplier, is there a way to get a lower multiplier and force a strapping setting? I'll try when I get home.

    Anyway I'm thinking that if I go from 334 to 333 a strapping boundary will be crossed and I'll see what happens then, especially to my memtest86+ memory speed values. What I learned is the Intel defined strapping boundaries are at 266, 333 and 400.

    Thanks

  6. #6
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
    Join Date
    Jan 2008
    Location
    PCB Island
    Posts
    25,940

    Default Re: P35-DS3L memory multiplier issue

    Ya you can try that, try 1-3 above or below the strap. Or you can use a lower cpu multiplier such as 8 and use 375 as FSB or use 400 and run at 3.2, whicI believe would be easiest to do, and then you could run at a lower multi. Or just run your ram at tighter timings and run it at 800 1:1 multi. Which in the end with tighter timings and 1:1 could be better/faster anyway

  7. #7
    Join Date
    Mar 2008
    Posts
    12

    Default Re: P35-DS3L memory multiplier issue

    Quick report,

    It's running very nicely at 334 FSB 3.33 multiplier. I got it run at 3.2 by changing to Turbo vs the Extreme I used for the 3.33.

    Since it's running so nice I'm just gonna leave it.

    BTW I did try 375 x 8 without any issues but the memory throughput was a bit lower that's why I'm staying at 334.
    I also did try 355 and to my surprise it also ran very well, I'll reserve this setting in case I run out of power later on.

    Thanks for your help.

  8. #8
    Join Date
    Mar 2008
    Posts
    12

    Default Re: P35-DS3L memory multiplier issue

    Another quick question,
    do you understand what the multipliers with the strapping values tied to them mean? I thought maybe if I hit the character they showed (~,#,=) it would use the strapping parameters at the multiplier I selected but there was no indication that it did anything.

    Thanks again

  9. #9
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
    Join Date
    Jan 2008
    Location
    PCB Island
    Posts
    25,940

    Default Re: P35-DS3L memory multiplier issue

    Well if you do not see the Strapping ~#=+ signs by the values shown then you are not in the strap range, if you do see them you can just select one of the ranges. NO extra key input is needed, and yeah I dont see a improvement or decrease in bandwidth myself either, but I havent done much testing on them as I keep a 1:1 ratio anyway.

    Here is a more in depth discussion about strapping>>>
    Code:
    http://www.xtremesystems.org/forums/showthread.php?t=128913
    http://www.thetechrepository.com/showthread.php?t=30
    http://www.overclock.net/intel-motherboards/145468-intel-overclocking-redefined-interesting-p965-975x.html

    Here is P35 straps

    FSB Strap to Northbridge
    200MHz, 266MHz, & 333MHz

    System Memory Multiplier
    Auto, 2.5, 3, 4~, 2, 2.4, 3.2, 3.33, 4+

    ~: 1066 MHz strapping, +: 800 Strapping MHz, #: 1333 MHz strapping

    At the above settings in the exact place the MCH/FSB are strapped to the same timings.

    FSB strap is a "start mark or set point" and ratio between the FSB and the Memory.

    Actually a lower fsb strap will allow you to push the cpu further by increasing the FSB. While a Higher Strap will allow your RAM to run much faster.

    Although the strap does specify latencies for the NB to run at the set strap levels, meaning if its the 1333Mhz FSB, it going to run with more lax timings then the 1066Mhz strap.

    say you have a E6400 that has a default multiplier of 8.

    well, you take the default multiplier, divide it by the multiplier you set, and then multiply it by the FSB you set, and then you get the Northbridge chipset clock.

    so 8/8 x 400 = for 400 mhz or 1600 mhz on the chipset clock.

    but then just lower the multiplier to 7, and stability should change cause your stressing the chipset even more.

    8/7 x 400 = 457 mhz or 1829 mhz on the chipset clock.

    even though all you did was change the multiplier.

    so the default multiplier is the less stressful multiplier to use, but it's also the most limiting in most cases, cause it's easier to do 7x 500 then it is to do 8 x 500.
    Your north bridge has an internal clock speed and latencies just like your CPU and memory. The FSB of your north bridge can be found by dividing your original CPU multiplier by your set CPU multiplier and then multiplying by your FSB.

    So if you are running a E6600 (266 * 9) at 400Mhz x 8 your NB FSB is:

    (9 / 8) x 400 = 450Mhz FSB (1800Mhz Total)

    Just like your memory may be able to run at 4-4-4-12 at 1000Mhz but needs to run at 5-5-5-15 at 1200Mhz, your north bridge has a series of latencies which it must adjust in order to maintain stability at its FSB. These latencies seem to play a far more significant role in system performance than memory latencies.

    Intel has predefined specific latencies at specific NB FSB speeds. They are referred to as straps. There is a strap for when the NB FSB is 1066Mhz and under, 1333Mhz FSB and under, 1600Mhz FSB and under, ect. When you go from the 1066Mhz FSB strap to the 1333Mhz FSB strap, the north bridge's internal latencies loosen to allow for greater stability.

    ASUS has redefined the NB strap so that the 1333Mhz FSB strap does not come into effect until 401Mhz FSB (1604Mhz). Other perimeters of straps are someone unknown.

    Tony, the guy who pretty much figured all this out and he works for OCZ. He is now a lobbyist trying to get ASUS and other major motherboard manufacturers to give the end user the control of when straps start.

    There are 2 ways to beat the NB strap:

    1. Boot to windows in the 1066Mhz strap and then use Clockgen to increase your CPU's FSB. You can then get to a much higher FSB while maintaining the 1066Mhz strap simply because the BIOS does not adjust the north bridge's latencies in real time.
    2. Get a X6800 or QX6700 (or even a ES chip). To the north bridge, you are always at a default multiplier with a Extreme Edition processor. This allows you to set a much lower or higher multiplier without the NB FSB being effected.

  10. #10
    Join Date
    Mar 2008
    Posts
    12

    Default Re: P35-DS3L memory multiplier issue

    Unfortunately the 4 multiplier is too high to be useful for me. I would like to have 3.33+, 3.33~ ,3.2+ and 3.2~ so I can get my CPU in the 3g-3.4g range with it's 9x max multiplier. The most my memory can go is around 1160. Do you know if the F8 bios has more options or if any are in the works?

    Another question if you don't mind, what parameters does the "Performance Enhance" option affect?

    Thanks for your time.

Page 1 of 2 12 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

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