-=PCTechTalk=- Re: memory question
- From: "cristy" <poppy0206@xxxxxxx>
- To: <pctechtalk@xxxxxxxxxxxxx>
- Date: Sun, 3 Aug 2008 00:52:10 -0400
Thanks Gman,
A fun time for a Sunday morning over coffee, so I guess in this case 2.5 gig
memory is better than 3 that I have now if they "play nice" and if the
computer case/cover plays nice with me.
thanks!
Christine
----- Original Message -----
From: "Gman" <gman.pctt@xxxxxxxxx>
To: <pctechtalk@xxxxxxxxxxxxx>
Sent: Sunday, August 03, 2008 12:45 AM
Subject: -=PCTechTalk=- Re: memory question
> When loking at memory speeds, it should be noted that the two names give
> for
> a specific speed are very much related.
>
> You are dealing with two different memory speeds here and it's easy to see
> where you're getting a bit confused. On the one hand, you have several
> modules designed for 400Mhz (PC3200) operation. The first number goes by
> the clock speed of the mainboard bus on which they will run. Since these
> are "DUAL data rate" (DDR) sticks, cut that number in half to arrive at
> the
> actual bus speed of 200Mhz. This is the number reported by CPU-Z and
> similar utilities. The two sticks that are not in the computer right now
> are also of this variety and should work well if installed with the new
> ones.
>
> On the other hand, the slower stick is designed to run at 333Mhz (PC2700),
> which means it expects to be mounted to a mainboard with a 166Mhz memory
> bus. Ignoring all dual-channel considerations, if this stick is
> installed,
> it will command that the entire board's memory bus be reduced to the
> 166Mhz
> speed and the rest of your RAM will run slower than designed. While it
> will
> not necessarily hurt the faster RAM, you will not be getting full use of
> them and the performance of the system will be considerably slower than it
> would be without the slower stick installed. Now, add back in the fact
> that
> the single stick also disables dual-channel mode and it's easy to see that
> it's probably not worth keeping the slower stick in there. An exception
> might be adding a LARGE slower stick to a pair of really small matched
> sticks with a faster speed. The addition of a LOT more RAM may offset the
> loss of speed and DC mode.
>
> So, remove the slower stick and its 'match' and install the other two
> matched set instead. Before closing the case, fire up the system and run
> CPU-Z to make sure the system has indeed returned to DC mode. If not,
> shut
> down and remove the two smaller sticks since they refuse to play nice with
> your shiny new 2GB set.
>
> Peace,
> Gman
>
> "The only dumb questions are the ones we fail to ask"
>
> ----- Original Message -----
> From: "cristy" <poppy0206@xxxxxxx>
> To: <pctechtalk@xxxxxxxxxxxxx>
> Sent: Saturday, August 02, 2008 11:24 PM
> Subject: -=PCTechTalk=- Re: memory question
>
>
>> The speed on my memory installed now is 200 for all butone stick, that
>> one
>> is 166. The speed on the two sticks not in the computer is 400. When
>> you
>> buy memory, can you buy say for instance a one gig stick with a speed of
>> 200
>> OR a one gig stick with a diff speed of 400 and if so is it more
>> expensive
>> for the higher speed one? OR must you buy a specific speed for your
>> computer. Also on three sticks installed the number 3200 is there but
>> one
>> one stick 2700 but I forgot what that number stands for.
>>
>> Christine
>
>
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