RAM and i925XE : 2 sticks or 4?

Discussion in 'Intel x86 CPUs and chipsets' started by Gibbon, Feb 11, 2005.

  1. Gibbon

    Gibbon grumpy old man

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    Hi Guys,

    I'm currently using 2 x 512MB sticks of RAM in my Asus P5AD2-E (i925XE). I want to go up to 2GB of RAM. Are there any disadvantages running 4 sticks as opposed to 2?

    Not interested in whether the RAM won't overclock as well, I'm running it well within its capability (550MHz DDR 1:1) at the moment so that won't be an issue - I'm more interested in whether anyone knows whether PAT is disabled with 4 sticks on the i925XE chipset/etc ... or anything else like that.

    Cheers,
    Gibbon.
     
    Last edited: Feb 11, 2005
  2. goatman

    goatman Member

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    afaik pat was turned off when 4 sticks were used in the i875 chipsets.
    probably the same deal with i9xx
     
  3. OP
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    Gibbon

    Gibbon grumpy old man

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    It was with i875, yes, but I don't know that it's safe to assume it's the same with i925XE (hence the question).
     
  4. chainbolt

    chainbolt Member

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    I would check in the Intel tech doc for the 925 chipset. The 4 module limitation for the 8x5 chipset was clearly mentioned.
     
  5. Ellroy80

    Ellroy80 Member

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    Can someone point me in the direction of docs that state that 4 sticks disables PAT on i875 boards? Must've missed this one.....
     
  6. OP
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    Gibbon

    Gibbon grumpy old man

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    I can't actually find it in any of the intel tech docs for i875P (though I've only downloaded a few) - indeed the memory config white paper for i875P shows that for DDR400, four sticks is the highest performance configuration. I'd heard people say it about i875P, but I didn't pay too much attention, I haven't had an i875P motherboard.

    I can't find anything about it in any of the i925XE docs I've downloaded either ... maybe I'm looking in the wrong place.
     
    Last edited: Feb 11, 2005
  7. Ellroy80

    Ellroy80 Member

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    This is what I have read as well. Though I think people have said that as soon as you o/c w/ 4 sticks PAT is turned off.
     
  8. OP
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    Gibbon

    Gibbon grumpy old man

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    I can't find anything that indicates why that would happen .. or indeed if it has any relevance to i925XE. Hmmmm.
     
  9. Ellroy80

    Ellroy80 Member

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    I remembered I had read something about this before, check it all out here. Make sure you read the whole thread.
     
  10. OP
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    Gibbon

    Gibbon grumpy old man

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    Hmm, interesting, cheers ... though to be honest I don't really care if it's enabled or not in i875P :)

    I need someone with the time and inclination to test 2 vs 4 with i925XE ... hehe. Doesn't appear to be any other way to know.
     
    Last edited: Feb 11, 2005
  11. Defsac

    Defsac Member

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    From the horse's mouth.
     
  12. OP
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    Gibbon

    Gibbon grumpy old man

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    Cheers, thanks for that. Wonder if it still holds true on i925XE with a 800MHz FSB processor at 1100MHz FSB :)

    Did you get that from the standard intel tech support email address?
     
  13. Defsac

    Defsac Member

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    I went to the email technical support section, chose "Chipsets" "Chipset Software" and then "Chipset Installation Utility" (wrong, but it sends the email to chipset tech support so it doesn't matter).
     
  14. chainbolt

    chainbolt Member

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    I am now using 4 modules on my P5AD2-E: No problem. I haven't fully tested yet, but it seems bandwidth is reduced. That's probabaly because I use 2 x 512 MB and 2 x 256 MB.
     
  15. caz67

    caz67 Member

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    Excellent, im going to get myself some more OCZ..
     
  16. chainbolt

    chainbolt Member

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    well, after some more testing I have found out that the 925 works like the 875: you can run 4 modules, but PAT must be disabled. I kept it enabled and the system became seriously unstable. Everything is fine when PAT is set to "AUTO" which obviously automatically disables the feature when 4 sockets are populated.
     

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