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AMD/Dual channel memory combo = decreased speed?

By penguinrusty
Jul 13, 2006
  1. Hi, I have a computer with a DFI Lanparty Nf4 sli-dr motherboard, AMD Athlon 64 3900+, and 4 sticks of 512mb of PC3200 ram. I had a friend tell me that because of the way i have it set up (the ram along with the processor) that because of AMD's memory controller archetecture it will slow my memory down to PC2700 (333mhz), but if I only had 2 1gb sticks it would be at it's supposed clock speed. Is this right?
     
  2. Didou

    Didou Bowtie extraordinair! Posts: 4,274

    Download CPU-z & see at what speeds they're running.
     
  3. penguinrusty

    penguinrusty TS Rookie Topic Starter

    Oh wow. I can't believe I didn't think of that. Thanks.
     
  4. penguinrusty

    penguinrusty TS Rookie Topic Starter

    Wow. It's only running at 200mhz! :(
     
  5. nickslick74

    nickslick74 TS Rookie Posts: 575

    It is Double Data Rate (DDR) memory. So it is 200 x 2 = DDR400.
     
  6. penguinrusty

    penguinrusty TS Rookie Topic Starter

    So then it's really running at the correct speed?
     
  7. Sharkfood

    Sharkfood TS Guru Posts: 1,019

    Yes, that's the correct speed.

    You likely have nothing to worry about as you have a newer CPU.

    Older Socket 939 CPU's with their built-in memory controller had problems using 4xdouble sided sticks of ddr400, and thus would run 2x = ddr400 speed, but 4x at ddr333 speed.

    Newer CPU's dont have this issue. You're cpu likely doesn't have this issue.
     
  8. penguinrusty

    penguinrusty TS Rookie Topic Starter

    Yea, I just read up on it and it's mostly just an issue with the Manchester 754's.
     
  9. Didou

    Didou Bowtie extraordinair! Posts: 4,274

    I do believe even newer CPUs have problems when all 4 memory modules are double-sided. But if they're single sided you can all run all 4 modules @ PC3200 with 1T command rate (which wasn't possible previously).
     
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