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Re: memory for an LX164



is that also true for AlphaPC164SX Mainboards? Im currently maxing out on
one board with 512 MB Samsung RAMS (4x128MB) i dont *need* more ram, but
alpha is a memory hungry platform - 256mb (in another machine) is just a
little too few ...

brgds & thanks in advance

Mike



> --- Urspr√ľngliche Nachricht ---
> Von: Juhana Helovuo <juhe iki fi>
> An: axp-list redhat com
> Betreff: Re: memory for an LX164
> Datum: Wed, 11 Jan 2006 13:28:23 +0200
> 
> Maurice Hilarius wrote:
>  >Ted Goodridge, Jr wrote:
>  >
>  >> You sure 256 sticks will work? My (albiet old copy of) manual shows
>  >> max  memory of 512 megs, 4x128 chips.
>  >>
>  >> I just wnat to be sure before I buy.
>  >>
>  >
>  >
>  >256MB modules work.
>  >The manual was written before 256MB modules were commonly available.
> 
> [I am now replying to a rather ancient thread, but I ran across the same 
> problem.]
> 
> 
> Maurice is right in the fact that 256MB unbuffered ECC SDRAM DIMMs work 
> in a 164LX motherboard. An 164LX data sheet by Samsung lists support for 
> 256MB DIMMs also.
> 
> However, not all 256MB DIMMs work, even if they satisfy the spec above.
> 
> For example, Kingston KVR133X72C3/256 (PC133) does NOT work, it is not 
> recognized by the motherboard at all. I tested this myself.
> 
> On the other hand, Kingston KVR100X72C2/256 (PC100) seems to work fine. 
> I tested this myself also.
> 
> The Kingston part numbers would lead one to think that the main 
> differences between these modules are the maximum supported frequency 
> (133 MHz vs. 100 MHz) and minimum CAS latency (3 clocks vs. 2 clocks), 
> but since the 164LX uses a frequency less than 100 MHz (66?), and both 
> of these modules should reach CL=2 at 100 MHz or less, the differences 
> do not seem significant.
> 
> The important difference seems to be the internal organization of the 
> memory modules. The organization of the DIMMs is visible to the memory 
> controller, as it has to generate memory addressing signals according to 
> the structure of the DIMMs.
> 
> The Kingston PC133 module is built from 9 chips of 256 Mbits each, with 
> an internal organization of 32M x 8 bits each. It seems that the 21174 
> memory controller on the 164LX board does not support this configuration.
> 
> The Kingston PC100 module is built from 18 chips of 128 Mbits each, with 
> an internal organization of 16M x 8 bits each. This is supported by the 
> 21174, although some older docs do not mention it.
> 
> 
> I did not successfully test other brands of memory, but I believe they 
> should be ok as long as they have a structure similar to the Kingston 
> PC100 part mentioned above.
> 
> 
> Juhana Helovuo
> 
> 
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