Re: AMD64-based laptops from HP/Compaq are crippled

From: alex goldman (hello_at_spamm.er)
Date: 07/05/05 

Date: Mon, 04 Jul 2005 21:44:22 -0700

NoNoBadDog! wrote:

>
> "alex goldman" <hello@spamm.er> wrote in message
> news:30288116.yHBXspxf0I@yahoo.com...
>> I've been researching my next laptop purchase, and whether it will run
>> Linux, and completely accidentally stumbled upon an alarming issue that
>> people need to be more aware about.
>>
>> Apparently (and if my understanding is correct), HP/Compaq disables
>> dual-channel memory access in Socket 939 motherboards, making CPU <-> RAM
>> communication slower, and overall performance less than what people would
>> expect when buying a system with the outward characteristics of what they
>> think they are getting.
>>
>> http://zv6000forums.com/viewtopic.php?t=148
>
>
> Since they are shipping with DDR and not DDr2, what would be the purpose
> of enabling the dual channel?

It would appear you are asking a question here, showing your confusion of
"dual channel" and DDR2, but then (below) you tell me to read AMD "white
papers", as if you have. Why would you do that?

> Have you been to the AMD website and reviewed their white papers for the
> AMD64 platform, and why they do *NOT* recommend DDR2 RAM?
>
> There is no perceivable increase in performance with DDR2 over DDR in a 64
> bit platform.
> The margin of difference is so small as to be insignificant.
>
> You should probably review the benefits of the AMD64 platform
> (hypertransport, on board memory controller, etc), that give the platform
> it's speed.
>
> Bobby

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