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Thread: 2GB to 4GB upgrade requires more latency?

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    Default 2GB to 4GB upgrade requires more latency?

    I have a Q6600 G0 on an ASUS P5W64 WS motherboard with DDR2-800 crucial balistix.

    Originally I had 2x1GB Crucial BL12864AA804.16FD3 working fine after adjusting the bios to DDR-2 800MHz 2.2V and 4-4-4-12.

    This was exactly according to Crucial specs and ASUS lists this module

    I just bought another 2 of the same, but memtest86+ freezes every time on Test#5 with all 4 modules in.

    Taking a closer look, I notice that the new modules are actually BL12864AA804.8FE5. I dont know if this makes any difference.

    Anyway, running at 5-5-5-12 everything is fine and Test#5 passes.

    Question 1: Should I care that i have to go to 5-5-5-12?
    -----------------------------------------------------------------------

    Anyway, I did a few more experiments:

    I tried running removing the old modules and just running the new modules at 4-4-4-12. It failed.

    So I tried running the new modules one at a time in one of the slots the old modules used to be in - both passed. (4-4-4-12)

    So I tried running the new modules in the old slots, if you see what I mean.
    (4-4-4-12) - failed

    (Failures are 100% repeatable and seem to always happen at the same place to me (wall time looks the same)

    I also have the following options in BIOS that I don't really know what to do with:

    Write Recovery Time: 4 or 5
    I changed this in sync with the other 4/5 timings

    Refresh Mode Select (RMS): 15.6 usec
    Making it lower makes no difference

    Refresh Cycle Time: Auto
    Dunno what it is so left it alone

    Read Delay: Auto
    Dunno what it is so left it alone

    Hyper Path 3: Enabled
    Disabled makes no difference

    Question 2: Should I care that I have paid for 4-4-4-12 and I can only run them at 5-5-5-12 in dual channel?
    ----------------------------------------------------------------------

    Question 3: Should I ask Crucial to exchange these new ones?
    ----------------------------------------------------------------------------------

    Question 4: Should I ask Crucial if they can exchange the new ones for .16FD3 ones?
    ----------------------------------------------------------------------

    I'm looking for a rock solid system now, that I can over clock later on as needs be.

    P.S. Oh, I develop software on Linux, but I do have Vista installed too. What alerted me to the problem was when I updated the windows experience index thingy and the system locked up. (And corrupted the bios settings) It had been working fine under linux for a day or two, but I might not have reached a very high watermark as I was mostly running things on servers elsewhere.

    P.P.S. Came here first as you lot were the most helpful and friendly last time!!!
    Last edited by Gareth; 16-05-2008 at 10:32. Reason: Trying to fix the page size.

  2. #2
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    Default

    This problem use to happen if you don't buy them in a kit or buy them at the same time. Mix ram always giving you a problem, unstable system.
    Quote Originally Posted by northshorefiend View Post
    Question 1: Should I care that i have to go to 5-5-5-12?
    It's up to you, if both ram have the same frequence and the one with lower lantency is run faster.

    Quote Originally Posted by northshorefiend View Post
    Question 2: Should I care that I have paid for 4-4-4-12 and I can only run them at 5-5-5-12 in dual channel?
    The different is only in few seconds in number crunching, in real world with a naked eye you can't tell the different. If you can get 4 sticks run stable at 5-5-5-12 then why not.

    Quote Originally Posted by northshorefiend View Post
    Question 3: Should I ask Crucial to exchange these new ones?
    How long do you the old one? slim chance any body want to exchange an open (used) ram.

    Quote Originally Posted by northshorefiend View Post
    Question 4: Should I ask Crucial if they can exchange the new ones for .16FD3 ones?
    Did you buy directly from Crucial? Why not take it back where you bought it for exchange?

    Anyway, if you can exchange the new one with no probelm or hassle then why not. Four indentical sticks always better than mix match one.

  3. #3
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    Default

    Thanks, I just wanted to check I wasn't doing anything stupid.

    I'll see if they will exchange them for the same as the first lot.

    I do a lot of heavy compiling all day sometimes, then testing against a couple of different databases, so I want to get as much as I can while keeping stability as a priority.

    I couldn't quite justify buying 4G back in November (I had moved to apple hardware but it was getting more and more unstable under OS X and even Linux and even FreeBSD, so I had to take the hit and take a loss)

    Just got an email back from crucial, (I did buy from direct from their website)

    Thank you for contacting Lexar Crucial. Due to higher than anticipated
    seasonal demand, we expect to reply to your e-mail within 5 to 7
    business days.
    Their delivery is very fast in getting to me; this is my third order I think. I'll be seeing if their after-sales is as good.

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    Default

    I should have said that when I ordered on-line I couldn't specify the suffix, just that I wanted BL12864AA804 which the website said were compatible with my mobo.

    In case anyone thinks I just ordered the wrong thing!

    The second order was the same as the first.

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    Quote Originally Posted by northshorefiend View Post
    Thanks, I just wanted to check I wasn't doing anything stupid.
    dont worry about that mate, iv made some incredibly stupid moves whilst learning, and im still doing now as i learn more.

    as deton said mixed memory is always a pain, its often just best to trail and error and find what works best.
    Coffee makes the world go round... its also vital for my bloodstream

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    Angry

    Well, I ran memtest86+ for 9 hours and got 7 passes (default all tests) with no errors with 4G at 5-5-5-12. So I decided to leave the new modules in.

    Today I did some PHP work, which is far from the usual load on this machine, and at the end of the day I'm getting segfaults and an unusable machine.

    Just goes to show that even 9 hours of memtest86+ is synthetic and means nothing!

    CPUZ tells me there is a 5-5-5-15 or something EPP timing at 400Hz on the modules, I can't remember off hand what it said and i'm in linux now. I might see if that is stable when I have time to fiddle.

    Occasional swapping is better than segfaults.

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    Crucial contacted my today. Firstly, they apologized for the late reply, which is a good start.

    Apparently, the second modules are single sided, the first double sided. This is hard to see by inspection because of the heatsink, but looks true to me.

    I should have double-sided by return of post. I don't know which are considered better, but it seems the P5W64 WS likes double-sided, for anyone out there that might have similar trouble.

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    the main problem will probably have been that your m/b was having to work in differant methods to access the differant memory modules, causing the problems you were having. glad you got it sorted
    Coffee makes the world go round... its also vital for my bloodstream

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    The double-sided modules arrived from crucial today and they work great!

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