[Pc_Support] Memory Technology and Chip Select -- WAS: Rules-of-thumb on upgrading components for an older mainboard ...

[William A. Mahaffey III]

Bryan J. Smith wrote:

> William A. Mahaffey III wrote:
>
>> The last 2 paragraphs bring up another point. I have seen some AM2
>> boards on NewEgg [1] that claim up to 16 GB of RAM on only 2 slots,
>
>
> Yeah?  So?
>
>> and almost always 16 GB w/ 4 slots.
>
>
> Huh?  Who says?  Just because 4GiB DDR DIMMs are the biggest right
> now, and even 4GiB DDR2 DIMMs are rare, doesn't mean JEDEC hasn't
> spec'd DDR2 to support much larger modules.
>
<snip>

>
>> Is this a typo, or are the standards for  DDR2 more expansive 
>> size-wise ?
>
>
> Don't know, haven't read the JEDEC PC2 (DDR2) standards in awhile.
>
>> Also, what about speeds vs RAM mass ?
>
>
> What do you mean by RAM "speed" and what do you mean by "RAM mass"?
>

Fair enough. By RAM mass I mean total amount of RAM, by speed I mean MHz 
that the RAM operates at.

Current DDR has limits on combinations of total RAM & speed, 2 GB (2 X 1 
GB, I think) at DDR400, 4 GB at DDR 333 (even with DDR400-rated RAM), 
does DDR2 lift these limits ?

> "Dual-channel" has to do with the interconnect from the DIMMs to the
> Intel MCH (memory controller hub) or AMD processor (which is directly
> connected to the memory).


Yeah, I am *quite* clear about dual channel. SGI used to have 8-way 
interleaved RAM back in the 72-pin DIMM days.


-- 

	William A. Mahaffey III

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