Two DIMMs, three differences. Which is better?

[micky]

So I need memrory for a computer that has only 256K!

A Dell Dimension 4700, it can take four 1-gig DIMMs and Cruscial
recommends one of the two below, but says the other is compatible too.
Everything about them including the price is the same, except what I
list on lines 2 vs.3 below. Which is better and why do they recommend
the other one? I know I could buy either one and probably not
notice the difference, but I would like to understand this.


Both are:
2GB kit (1GBx2) Unbuffered NON-ECC 1.8V 128Meg x 64 DDR2

One is:
PC2-5300 CL=5 DDR2-667 Part #: CT908120
The other is:
PC2-6400 CL=6 DDR2-800 Part #: CT1449212


If you want to see the url itself, this is it:
http://www.crucial.com/store/listparts.aspx?model=Dimension 4700 Series)


I'd also note that again the listings say nothing about parity. Or
do they? Perhaps 128Meg x 64 means even parity since it's 64 and not
72 ??

OTOH, if I'm confused and that's not how you figure out parity: Now
when I'm using the Crucial or Kingston part number finder, I guess
they don't have to say, but Crucial describes all those other values.
Why is parity left out


Thanks a lot.

 

[John McGaw]

So I need memrory for a computer that has only 256K!

A Dell Dimension 4700, it can take four 1-gig DIMMs and Cruscial
recommends one of the two below, but says the other is compatible too.
Everything about them including the price is the same, except what I
list on lines 2 vs.3 below. Which is better and why do they recommend
the other one? I know I could buy either one and probably not
notice the difference, but I would like to understand this.


Both are:
2GB kit (1GBx2) Unbuffered NON-ECC 1.8V 128Meg x 64 DDR2

One is:
PC2-5300 CL=5 DDR2-667 Part #: CT908120
The other is:
PC2-6400 CL=6 DDR2-800 Part #: CT1449212


If you want to see the url itself, this is it:
http://www.crucial.com/store/listparts.aspx?model=Dimension 4700 Series)


I'd also note that again the listings say nothing about parity. Or
do they? Perhaps 128Meg x 64 means even parity since it's 64 and not
72 ??

OTOH, if I'm confused and that's not how you figure out parity: Now
when I'm using the Crucial or Kingston part number finder, I guess
they don't have to say, but Crucial describes all those other values.
Why is parity left out


Thanks a lot.

Your computer is old and uses an Intel 915G Express chipset which does not
support either parity or ECC so there is no need to bother about them.
Unless you are going to attempt some sort of overclocking, not something
the newcomer should contemplate with a Pentium 4, either part will work fine.

 

[larry moe 'n curly]

So I need memrory for a computer that has only 256K!

A Dell Dimension 4700, it can take four 1-gig DIMMs and Crucial
recommends one of the two below, but says the other is compatible too.
Everything about them including the price is the same, except what I
list on lines 2 vs.3 below. Which is better and why do they recommend
the other one? I know I could buy either one and probably not
notice the difference, but I would like to understand this.


Both are: 2GB kit (1GBx2) Unbuffered NON-ECC 1.8V 128Meg x 64 DDR2

One is: PC2-5300 CL=5 DDR2-667 Part #: CT908120

The other is: PC2-6400 CL=6 DDR2-800 Part #: CT1449212


If you want to see the url itself, this is it:
http://www.crucial.com/store/listparts.aspx?model=Dimension 4700 Series)

I'd also note that again the listings say nothing about parity. Or
do they? Perhaps 128Meg x 64 means even parity since it's 64 and not
72 ??

128MB x 64 is 64 data bits wide and has no parity/ECC bits.

128MB x 72 is 64 data bits wide plus 8 parity/ECC bits.

Whether the parity is even or odd is irrelevant to the module because
it's the computer's memory controller that determines the parity it
writes to the parity/ECC RAM chips.

256K? Do you mean 256M? Are you running Windows 2000? 98?

 

[micky]

128MB x 64 is 64 data bits wide and has no parity/ECC bits.

128MB x 72 is 64 data bits wide plus 8 parity/ECC bits.

Whether the parity is even or odd is irrelevant to the module because
it's the computer's memory controller that determines the parity it
writes to the parity/ECC RAM chips.
Thanks.

256K? Do you mean 256M? Are you running Windows 2000? 98?

Yeah, I meant 256M.