Results 1 to 10 of 10

Thread: Incorrect RAM timings from SPD?!

  1. #1
    Zzzzzzz sleepyhead's Avatar
    Join Date
    Nov 2007
    Posts
    2,514
    Thanks
    373
    Thanked
    292 times in 162 posts

    Incorrect RAM timings from SPD?!

    Abit FP-IN9 SLi mobo
    Corsair XMS2 PC6400 (800Mhz) C4 DHX, 2GB. 4-4-4-12

    Any reason why my mobo would automatically specify the timings to be 5-5-5-18?! Or is the mobo just showing that as it's currently set to auto in BIOS?

    Another question..before I change the timings to 4-4-4-12, should I try it at 1T and ramp the voltage up to the 2.1v that is on the label?

  2. #2
    Senior Member
    Join Date
    Nov 2006
    Posts
    525
    Thanks
    2
    Thanked
    2 times in 2 posts

    Re: Incorrect RAM timings from SPD?!

    SPD gives out safe settings, and the standard settings for PC6400 are 5-5-5-18.

    Corsair have specified it to run at faster timings, so just set it manually in BIOS.
    Asus Z170 Pro Gaming. i5-6500. 16gig Ripjaw 2400. Samsung 950pro NMVe 250gig. GTX Titan. Enermax MaxPro 600W.



    939 3800 X2 | 2gig corsairXMS 3200C2
    1950XT | 500gig,320,200,160
    Plextor DVD burner | Yamaha CRW-F1 CD-drive
    Thermaltake Xaser 3 w 480W FSP | X-fi fatal1ty

    Things have moved on since I first joined...

  3. #3
    Member
    Join Date
    Aug 2007
    Location
    Madrid
    Posts
    131
    Thanks
    0
    Thanked
    14 times in 14 posts

    Re: Incorrect RAM timings from SPD?!

    Just wanted to confirm that Fabula is correct, my corsair RAM does this too, it's normal, it defaults to slower, safer timings, to guarentee the system will boot, just change it in the BIOS.

  4. #4
    Zzzzzzz sleepyhead's Avatar
    Join Date
    Nov 2007
    Posts
    2,514
    Thanks
    373
    Thanked
    292 times in 162 posts

    Re: Incorrect RAM timings from SPD?!

    Ahh..well that explains it then

    Previous RAM I have used (Corsair DDR XMS stuff), the mobo picked up the right timings from the SPD

    But should I ramp the voltage up to 2.1v like it says on the DIMM or leave it at the current auto selected BIOS setting of 1.85v?

  5. #5
    Resident abit mourner BUFF's Avatar
    Join Date
    Jul 2003
    Location
    Sunny Glasgow
    Posts
    8,067
    Thanks
    7
    Thanked
    181 times in 171 posts

    Re: Incorrect RAM timings from SPD?!

    if you are setting the tighter timings then increase the RAM voltage to the specified level too.

    MSI P55-GD80, i5 750
    abit A-S78H, Phenom 9750,

    My HEXUS.trust abit forums

  6. #6
    Member
    Join Date
    Aug 2007
    Location
    Madrid
    Posts
    131
    Thanks
    0
    Thanked
    14 times in 14 posts

    Re: Incorrect RAM timings from SPD?!

    As I understand it, it's the motherboard/BIOS that reads the SPD then backs the timings off a little, this is probably most useful for those that like to over clock and who push the timings too far while trying to find the limit...

    I suspect it's motherboard dependent as to whether it will back them off a little, or not... some boards will, while some won't, either way in my experience, it seems to be normal behaviour for the very high spec motherboards that people like to over clock.

    If I was in your shoes, and it said '2.1v' on the DIMM, then I would ramp it up to that, I trust the people that make it to know what they are talking about lol.

  7. #7
    Resident abit mourner BUFF's Avatar
    Join Date
    Jul 2003
    Location
    Sunny Glasgow
    Posts
    8,067
    Thanks
    7
    Thanked
    181 times in 171 posts

    Re: Incorrect RAM timings from SPD?!

    if you use something like CPU-Z to show the SPD table you'll see that the SPD timing is probably programmed with looser timings than the manufacturer's advertise.
    All the mobo is doing is reading that SPD table & setting those timings.

    MSI P55-GD80, i5 750
    abit A-S78H, Phenom 9750,

    My HEXUS.trust abit forums

  8. #8
    Member
    Join Date
    Aug 2007
    Location
    Madrid
    Posts
    131
    Thanks
    0
    Thanked
    14 times in 14 posts

    Re: Incorrect RAM timings from SPD?!

    CPUz shows my corsair exactly at rated spec, 2-3-2-6 but if I boot with my ASUS board on 'auto' then it never comes up with those timings, they are always slower... If I put the ram in another board (MSI K8T Neo) then it boots at 2-3-2-6 on auto, it's just the ASUS board that slows things down leading me to think it's board/BIOS dependent :shrug:

  9. #9
    Resident abit mourner BUFF's Avatar
    Join Date
    Jul 2003
    Location
    Sunny Glasgow
    Posts
    8,067
    Thanks
    7
    Thanked
    181 times in 171 posts

    Re: Incorrect RAM timings from SPD?!

    some mobos have Auto & "by SPD" as options

    MSI P55-GD80, i5 750
    abit A-S78H, Phenom 9750,

    My HEXUS.trust abit forums

  10. #10
    Zzzzzzz sleepyhead's Avatar
    Join Date
    Nov 2007
    Posts
    2,514
    Thanks
    373
    Thanked
    292 times in 162 posts

    Re: Incorrect RAM timings from SPD?!

    Poking around the Corsair site, you guys are right on the ball. Designed to boot at 5-5-5-18 but tested to run at 4-4-4-12 @ 2.1V

    I believe that my mobo doesn't have SPD, just AUTO and MANUAL hence it defaults back to the JEDEC (is that right?) settings.

    Woo hoo, tighter timings here I come...well eventually once I get home from work.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. C2D Overclocking Guide For Beginners P5K Add-On
    By Clunk in forum PC Hardware and Components
    Replies: 638
    Last Post: 28-07-2016, 10:13 AM
  2. Ram Timings
    By runark in forum PC Hardware and Components
    Replies: 1
    Last Post: 30-09-2007, 08:10 PM
  3. Overclocking Question
    By planetgong in forum PC Hardware and Components
    Replies: 13
    Last Post: 12-12-2005, 09:29 AM
  4. Best Corsair RAM for Asus P4C800-E ?
    By solrak in forum PC Hardware and Components
    Replies: 28
    Last Post: 19-08-2003, 12:04 AM

Posting Permissions

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