Help! Dual Channel RAM Problem!

Discussion in 'General Hardware' started by ray_gillespie, Jul 12, 2005.

  1. ray_gillespie

    ray_gillespie Moderator Staff Member Political User

    Messages:
    1,692
    Location:
    Birmingham, UK
    I've screwed up a bit with my new rig. I bought 512MB of Crucial PC3200 RAM with a mobo and CPU from Komplett. Now that worked fine, I had no problems. Then, I decided to buy another 512MB of the same RAM, with the same manufacturere code, but from Dabs. When it arrived, the box was identical to that of the first RAM. However, when I took it out of the box, I noticed that it was double sided, whereas the 1st lot of RAM I got was single sided. I was a bit suspicious but I tried to run them on the same channel, and lo and behold my system wouldn't boot. So at present, I've got them on different channels, so I still have the full 1GB but it's only single not dual channel. What has happened here? Who has sent the wrong RAM? Or should I have bought it from the same supplier?
    Also, what kind of speed increase would I get from running dual channel. Eventually, I will want 2GB of RAM, will I be able to use 2 double sided on one channel and 2 single sided on the other channel?

    EDIT: Also, I my system has completely frozen twice since installing the new RAM in a different channel, and I hadn't had a single problem when just using the first RAM that I got.
     
    Last edited: Jul 13, 2005
  2. kcnychief

    kcnychief █▄█ ▀█▄ █ Political User Folding Team

    Messages:
    16,948
    Location:
    Massachusetts
    From my personal experience, it is always best to use the SAME EXACT RAM througout a system. You want this for a few reasons, but mostly to make sure the clock speeds and CAS Latency are identical. If not, they will all slow down to the slowest chip. As far as the wrong type, although RAM may look correct at first glance, if you are off by one digit on those long 8-16 model numbers on some RAM types, you will receive something different. Don't even rest on comparing pictures, because sometimes those are stock photos. You don't "have to" get from the same manufacturer, but if you can't, verify the model number EXACTLY. This way, if it happens again, they are 100% at fault.

    It's no surprise that your computer is freezing, it probably is getting confused with the different RAM types. I would take out the double-sided chip, either return it or eBay it (if the return grace period has expried) and get the proper type.
     
    ray_gillespie likes this.
  3. ray_gillespie

    ray_gillespie Moderator Staff Member Political User

    Messages:
    1,692
    Location:
    Birmingham, UK
    Thanks for the reply. The RAM only arrived yesterday, so I'll see if I can return it. The only problem is, how does one know whether the RAM is double or single sided? The codes on the packs and on the websites are identical, the only difference is on the sticker on the RAM itself; they both have the same code but with an extra few digits that differ stuck on the end, i.e. CT6464Z40B.16d or something, and CT6464Z40B.8dw. I can't remember exactly what they are, but these extra digits on the end of the code on the RAM are not shown anywhere on the box or on either website. I've emailed Komplett and Dabs, so I'll have to wait to see what they suggest. Anyway, thanks for your help.

    Reps out as usual.
     
  4. kcnychief

    kcnychief █▄█ ▀█▄ █ Political User Folding Team

    Messages:
    16,948
    Location:
    Massachusetts
    Can you link to the items where they were purchased from?
     
  5. ray_gillespie

    ray_gillespie Moderator Staff Member Political User

    Messages:
    1,692
    Location:
    Birmingham, UK
  6. kcnychief

    kcnychief █▄█ ▀█▄ █ Political User Folding Team

    Messages:
    16,948
    Location:
    Massachusetts
    Looks like you have a legitimate case. On the Dabs page, I noticed, it says "Image for Illustrative Purposes only". But, the Manufacturer Part Number are identical, I'd wait to see what they have to say. It definitely appears one of them messed up, good luck.
     
  7. ray_gillespie

    ray_gillespie Moderator Staff Member Political User

    Messages:
    1,692
    Location:
    Birmingham, UK
    Cheers, I'll let you know what happens.
     
  8. mlakrid

    mlakrid OSNN BASSMASTER Political User Folding Team

    Its easiest to buy identical RAM, preferably from the same place... worst case, you will have to pay the restocking fee...

    I would fight it, plus if you paid with a Credit card just send it back and refuse payment on the CC...

    I have been through this numerous times... and I have won all but one.... and on that one the only thing I didnt get back was shipping and partial restocking fee...

    :D
     
  9. dragonbeat

    dragonbeat old timer

    Messages:
    73
    Location:
    ANGLESEY,WALES.UK
    had the same problem when i bought a module of memory from ebuyer,that was double sided and made abroad (can't remember where )the memory which i bought from crucial was single sided and made in the uk (which is printed on sticker fixed to module).My motherboard would not accept these two different modules so i bought more ram from crucial and now running dual at 2048 and got rid of the other memory on ebay!if you order from crucial you get free postage and next day delivery,and little bit cheaper .:laugh:
     
    ray_gillespie likes this.
  10. ray_gillespie

    ray_gillespie Moderator Staff Member Political User

    Messages:
    1,692
    Location:
    Birmingham, UK
    I've just had an email back from Komplett saying that they use mixed batches and they cannot confirm whether what they despatch will be single or double sided. What is that about?
    As for Dabs, I'm slightly concerned about my pc freezing twice in one night while I had both sets of RAM installed. Is it more likely to be the Dabs RAM being defective, or having both sets installed, that is the problem?
    What should I do? I can't believe I can't find out whether I am ordering single or double sided RAM!
     
  11. kcnychief

    kcnychief █▄█ ▀█▄ █ Political User Folding Team

    Messages:
    16,948
    Location:
    Massachusetts
    The best thing I can suggest is find out which vendor can actually guarentee what they will ship. When you find which one won't, return the stick to that vendor, and re-buy from the other vendor. Sticky regardless.
     
  12. dragonbeat

    dragonbeat old timer

    Messages:
    73
    Location:
    ANGLESEY,WALES.UK
    all ram modules from crucial uk are single sided,of the 4 modules in my base unit 3 are direct from crucial uk.the other which i bought from e bay. go to their web site its quite good and helpfull.
     
  13. lancer

    lancer There is no answer! Political User Folding Team

    Messages:
    3,093
    Location:
    FL, USA
    double channel doesn't really speed things up, even though its supposed to theoritically its supposed to almost double the mem speed. but in true life i think the increase is like 10-15%.
     
  14. ray_gillespie

    ray_gillespie Moderator Staff Member Political User

    Messages:
    1,692
    Location:
    Birmingham, UK
    Cool, well I just emailed them to see if they will confirm that it is single sided. Hopefully Dabs will take my old RAM back, and then I'll get the new RAM from Crucial. Thanks the for the tip mate.
    I still can't believe that places can't confirm whether the RAM is single or double sided! Why do they even make it? Is double sided RAM for export markets or something?

    It does strike me as a lot of fuss over not very much, but I just assembled a whole new PC (except graphics card) and I've been waiting so long for this that I want everything running as best as possible.
     
  15. mlakrid

    mlakrid OSNN BASSMASTER Political User Folding Team

    Depending on what kind of memory, you can get significant increases in performance ESPECIALLY if you OC....
     
  16. ray_gillespie

    ray_gillespie Moderator Staff Member Political User

    Messages:
    1,692
    Location:
    Birmingham, UK
    I got an email back from Crucial, and they told me that I would probably get single sided if I ordered off the website, but they could guarantee that I would get it if I ordered over the phone, which I have now done. About £38 inc. VAT and with free next day delivery. I am very impressed, if this thing comes as promised I will henceforth always get RAM direct from these dudes!
     
  17. lancer

    lancer There is no answer! Political User Folding Team

    Messages:
    3,093
    Location:
    FL, USA
    That is true, but in my experience why overclock the mem, just buy more and faster in the beginning.
     
  18. ray_gillespie

    ray_gillespie Moderator Staff Member Political User

    Messages:
    1,692
    Location:
    Birmingham, UK
    Well, it arrived this morning! Crucial are excellent, I only ordered it yesterday afternoon, and I didn't even have to pay postage.
    I fitted it an hour ago and it worked perfectly. 128-bit dual channel all the way!

    I've still heard nothing from Dabs however.
     
  19. dragonbeat

    dragonbeat old timer

    Messages:
    73
    Location:
    ANGLESEY,WALES.UK
    :) glad you liked the service ,they also supply graphic cards also which im sure are a bit cheaper.:yowch:
     
  20. LeeJend

    LeeJend Moderator

    Messages:
    5,291
    Location:
    Fort Worth, TX
    Guys, he is running a socket 939 rig. Dual channel RAM will do memory transfers significantly faster (not much impact for gaming but a big improvement in audio & video conversion and data intesive applications).

    On a socket 754 or the old socket A dual channel memory does nothing because the FSB is chokng throughput.