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ASUS MthrBrd A7S333 DDR333 DIM questions?

Posted on 2006-03-26
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MB manual says use only listed DDR333 DIMM Qualified Vendor list.  MB uses only "DDR SDRAM DIMMs".  "Only 2 DIMS will support 333MHz-PC2700."  If more, reverts to 266MHz.  Largest size on DDR333 DIMM Qualified Vendor list is 256MB.  "Max 2GB PC2700"

I want a gig or more of memory.  

1.  Moving from 512MB of memory to 1 GB+ of memory will result in faster performance when I am running a lot of programs at once?
2.  Will I see worthwhile speed increase by using DDR333 DIMM rather than non-DDR333?
3.  Can I have 1 gig of PC2100 DIMM in one socket and 2 * 256MB DDR333 Qualified Vendor DIMM in other two sockets and get still get 333MHz from the 2 * 256MB DDR333 Qualified Vendor DIMM?
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Question by:raymm
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garycase earned 2000 total points
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(1)  Yes.   There will be a nice performance increase if you run multiple programs when you go from 512M to 1GB.   There's much less difference when you go beyond that.

(2)  If possible I would stay with DDR333 -- the faster memory accesses definitely improve your performance.  It's not a direct computation (cache influences the actual difference you'll see), but basically DDR333 vs DDR266 is simply 333/266 = 25% faster memory bandwidth.

(3)  NO!!   If you mix speeds, all the memory will operate at the lowest speed.   Further, the motherboard's design clearly reduces the interface speed to at-most 266MHz if you install more than 2 DIMMs.

You do NOT have to use memory from their qualified memory list.   Go to Crucial's memory selector (www.crucial.com) and look up your motherboard ==> they sell both 512MB and 1GB DDR333 modules for your motherboard.   You could use two of those and the board will run at DDR333 speeds and let you have either 1GB or 2GB of memory.
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by:raymm
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>reduces the interface speed to at-most 266MHz if you install more than 2 DIMMs.
Quote from manual:  "Three sockets are available for both 266MHz-PC2100 or 200 MHZ PC1600 DDR DIMMs to form a memory size of 64MB to 3GB.  Only 2 DIMMs will support 333MHz-PC2700; if more than 2 333MHz DIMMs are installed, the system auto reverts to max speed of 266MHz."

When I read above, I don't see prohibition on mixing speeds.  Am I reading too literally?  Is it your experience that mixing speeds will result in lower speed?
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by:raymm
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Crucial includes PC3200 in recommends, but ASUS MthrBrd A7S333 manual only refers to max PC2700.

1.  Will PC3200 work on ASUS MthrBrd A7S333?
2.  Will PC3200 provide added speed?
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by:raymm
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by:garycase
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Yes, mixing speeds will result in the memory bus working at the speed of the slowest module.

The PC3200 modules will work, but won't provide any added benefit => they'll simply work at the DDR333 speed.
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by:garycase
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No PC2100 is not better than PC3200.   Memory prices vary a lot based on supply and demand -- faster modules are not always more expensive.
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by:raymm
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PC3200 is faster/better than PC2100?
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by:raymm
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Sorry, meant to say PC2700 is faster/better than PC2100?
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by:garycase
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Yes, PC2700 is faster than PC2100.   Not "better" -- they're both just memory; and as long as it's reliable the speed doesn't make it "better" => just faster :-)
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