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Question on Memory

Posted on 1998-08-20
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Last Modified: 2013-11-10
I am thinking about buying some new memory.  I checked the manual for my motherboard ( a Biostar 8500TVD w/VX Chipset ) and it says that it supports Unbuffered 15ns SDRAM DIMM modules.  All I've been able to find to buy though is 10ns unbuffered?  Do they still make 15ns?  Can I use 10ns?
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Question by:bolesja
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by:arngu
ID: 1123407
The memory you have is faster than the memory you need, In fact it is a matter of timing, that the memory can deliver Information whenever it is needed. In your case, the memory can deliver info every 10 ns, and the requests come every 15 ns, so every 2nd request from RAM brings an error. I assume you can use the memory, but it is slow as a DIMM with 30ns. Solution would be, to set timing parameters on your motherboard, as if yu use 20ns DIMMs, and you win!
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Expert Comment

by:arngu
ID: 1123408
The memory you have is faster than the memory you need, In fact it is a matter of timing, that the memory can deliver Information
       whenever it is needed. In your case, the memory can deliver info every 10 ns, and the requests come every 15 ns, so every 2nd
       request from RAM brings an error. I assume you can use the memory, but it is slow as a DIMM with 30ns. Solution would be, to
       set timing parameters on your motherboard, as if yu use 20ns DIMMs, and you win!
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by:rmarotta
ID: 1123409
Wrong!!  (If I understand that proposed "answer" correctly)

Memory that is rated faster than what is specified can always be used.

The use of slower timings simply allows the faster memory to opeate in an under-utilized fashion.  Much the same as driving 30 MPH in a car rated for 100MPH operation.

The answer to your question:  "Can I use 10ns?"  .....is yes!

Regards,
Ralph
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Expert Comment

by:ewilson
ID: 1123410
I have heard arngu's argument before from other sources but i believe rmarotta to be right, this seems to be a common question now. personal experience i have pc100 sdram running with no problems or decrease of speed on 66 bus.. the reason you can't find any 15 ns ram is because 10 ns will work fine.
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by:bolesja
ID: 1123411
It seems you're outvoted. rmarotta submit the answer --> you get the points
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rmarotta earned 20 total points
ID: 1123412
Glad to help.
Regards,
Ralph
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