ram "performs at..." ?

Al

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I thought I knew memory designations, until I see this at Dell:
"256MB Shared DDR SDRAM at 333MHz (Performs at 266MHz for 400FSB systems)"

What could that mean? I'm guessing it has installed DDR333 PC2700 memory. What
does the 'performs at' language mean here? Thanks.
 
G

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"Al" <none@no.com> wrote in message
news:42189d1e.16092059@news.individual.net...
>I thought I knew memory designations, until I see this at Dell:
> "256MB Shared DDR SDRAM at 333MHz (Performs at 266MHz for 400FSB systems)"
>
> What could that mean? I'm guessing it has installed DDR333 PC2700 memory.
> What
> does the 'performs at' language mean here? Thanks.


What it means is that PC2700 333mhz DDR will run only at 266mhz if used with
a (Celeron or P4) 400mhz FSB CPU.


Stew
 
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I would read it that if you install it in a machine that only supports
PC2100, then it runs as PC2100
"Al" <none@no.com> wrote in message
news:42189d1e.16092059@news.individual.net...
>I thought I knew memory designations, until I see this at Dell:
> "256MB Shared DDR SDRAM at 333MHz (Performs at 266MHz for 400FSB systems)"
>
> What could that mean? I'm guessing it has installed DDR333 PC2700 memory.
> What
> does the 'performs at' language mean here? Thanks.
 

Al

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On Wed, 16 Feb 2005 16:56:09 -0600, "S.Lewis" <stew1960@cover.bellsouth.net>
wrote:

>
>"Al" <none@no.com> wrote in message
>news:42189d1e.16092059@news.individual.net...
>>I thought I knew memory designations, until I see this at Dell:
>> "256MB Shared DDR SDRAM at 333MHz (Performs at 266MHz for 400FSB systems)"
>>
>> What could that mean? I'm guessing it has installed DDR333 PC2700 memory.
>> What
>> does the 'performs at' language mean here? Thanks.
>
>
>What it means is that PC2700 333mhz DDR will run only at 266mhz if used with
>a (Celeron or P4) 400mhz FSB CPU.
>
>
>Stew
>

that's what I don't get. If the CPU supports 400FSB, then is it the board
which can only run at 266FSB max? If that's true, then why use such a slow
board with faster memory and processor? I imagine there wpould be a notoceable
slowdown in the whole system from using such a slow board - but you can't see
what board is being used, from Dell's pages.
 
G

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"Al" <none@no.com> wrote in message
news:4213d881.1425059@news.individual.net...
> On Wed, 16 Feb 2005 16:56:09 -0600, "S.Lewis"
> <stew1960@cover.bellsouth.net>
> wrote:
>
>>
>>"Al" <none@no.com> wrote in message
>>news:42189d1e.16092059@news.individual.net...
>>>I thought I knew memory designations, until I see this at Dell:
>>> "256MB Shared DDR SDRAM at 333MHz (Performs at 266MHz for 400FSB
>>> systems)"
>>>
>>> What could that mean? I'm guessing it has installed DDR333 PC2700
>>> memory.
>>> What
>>> does the 'performs at' language mean here? Thanks.
>>
>>
>>What it means is that PC2700 333mhz DDR will run only at 266mhz if used
>>with
>>a (Celeron or P4) 400mhz FSB CPU.
>>
>>
>>Stew
>>
>
> that's what I don't get. If the CPU supports 400FSB, then is it the board
> which can only run at 266FSB max? If that's true, then why use such a slow
> board with faster memory and processor? I imagine there wpould be a
> notoceable
> slowdown in the whole system from using such a slow board - but you can't
> see
> what board is being used, from Dell's pages.


What system are we talking about here, dood? (2400 or 3000 Dimension?)

The board isn't the limitation - the *CPU FSB (external clock speed) is*,
which currently means a Celeron (400 FSB) running PC2700/333mhz DDR RAM
chokes the RAM back to 266mhz .(333mhz these days is even considered
"slower" than the current PC3200/400mhz DDR or above and DDR2 speeds.)

You'll have to have a CPU with a 533mhz FSB or better to "get" 333mhz out of
PC2700.

There are now Celerons out with a 533mhz FSB and 256mb cache, btw....


Stew
 

Al

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Archived from groups: alt.sys.pc-clone.dell (More info?)

On Wed, 16 Feb 2005 19:01:33 -0600, "S.Lewis" <stew1960@cover.bellsouth.net>
wrote:

>The board isn't the limitation - the *CPU FSB (external clock speed) is*,
>which currently means a Celeron (400 FSB) running PC2700/333mhz DDR RAM
>chokes the RAM back to 266mhz .(333mhz these days is even considered
>"slower" than the current PC3200/400mhz DDR or above and DDR2 speeds.)
>
>You'll have to have a CPU with a 533mhz FSB or better to "get" 333mhz out of
>PC2700.

thanks. I did get the P4 2.8 GHz 533FSB in a Dimension 3000 So, the PC2700 is
underutilized with a lesser speed FSB processor - and faster memory (400FSB)
would be somewhat wasted in the P4 533FSB?

I guess I learned something.
 
G

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"Al" <none@no.com> wrote in message
news:4214d976.3137223@news.individual.net...
> On Wed, 16 Feb 2005 19:01:33 -0600, "S.Lewis"
> <stew1960@cover.bellsouth.net>
> wrote:
>
>>The board isn't the limitation - the *CPU FSB (external clock speed) is*,
>>which currently means a Celeron (400 FSB) running PC2700/333mhz DDR RAM
>>chokes the RAM back to 266mhz .(333mhz these days is even considered
>>"slower" than the current PC3200/400mhz DDR or above and DDR2 speeds.)
>>
>>You'll have to have a CPU with a 533mhz FSB or better to "get" 333mhz out
>>of
>>PC2700.
>
> thanks. I did get the P4 2.8 GHz 533FSB in a Dimension 3000 So, the PC2700
> is
> underutilized with a lesser speed FSB processor - and faster memory
> (400FSB)
> would be somewhat wasted in the P4 533FSB?
>
> I guess I learned something.


Correct. Assuming one paired up a 533mhz FSB CPU with PC3200/400mhz DDR, the
RAM would run at only 333mhz - in a similar fashion.


Stew
 

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