FB-DIMM advice

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  • Reply 21 of 23
    messiahmessiah Posts: 1,689member
    Okay, so assuming that I will never upgrade this particular machine past 4GB, and that I won't be migrating the memory when I buy a new machine, am I right in saying that the optimum configuration is:



    Upper riser

    DIMM1:1GB, DIMM2:1GB, DIMM3:empty, DIMM4:empty



    Lower riser

    DIMM1:1GB, DIMM2:1GB, DIMM3:empty, DIMM4:empty



    rather than



    Upper riser

    DIMM1:512MB, DIMM2:512MB, DIMM3:512MB, DIMM4:512MB



    Lower riser

    DIMM1:512MB, DIMM2:512MB, DIMM3:512MB, DIMM4:512MB



    because only DIMMs 1 & 2 on each riser are capbable of 256bit?



    So even if I put in eight matched DIMMs, only DIMMs 1 & 2 on each riser will work at 256bit and the others will work at 128bit?



    Jeez, confusing, eh?
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  • Reply 22 of 23
    messiahmessiah Posts: 1,689member
    Thanks for all the replies, guys.



    I'm about to invest (what for me) is a lot of money. I just want you all to know that I appreciate all your advice. It's nice to know that you are getting the best value for your money when it comes to RAM!



    Cheers guys!
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  • Reply 23 of 23
    jeffdmjeffdm Posts: 12,954member
    Quote:
    Originally Posted by Messiah


    Thanks for all the replies, guys.



    I'm about to invest (what for me) is a lot of money. I just want you all to know that I appreciate all your advice. It's nice to know that you are getting the best value for your money when it comes to RAM!



    Cheers guys!



    Yes, your first example is going to be faster than your second example.



    So I suggest the first example that you gave:



    Upper riser

    DIMM1:1GB, DIMM2:1GB, DIMM3:empty, DIMM4:empty



    Lower riser

    DIMM1:1GB, DIMM2:1GB, DIMM3:empty, DIMM4:empty



    I will say that this is a better way for two reasons, because it does leave slots open in case you do need to upgrade again and you avoid the higher latency of the slots 3&4 on each riser. The costs don't seem to be that much different anyway. Heck, if you needed 8GB, the costs aren't enough of a savings to justify buying 8x 1GB chips vs. 4x 2GB chips, at least in my opinion.



    I think Hiro's statement covers mis-matched sets of memory, where you have different sizes of memory on the upper and lower riser. If you have all matching memory I think it will be fine the way you suggested.
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