200 or 400Mhz?

[Chris]

Archived from groups: alt.comp.hardware.overclocking.amd (More info?)

Hello:

I have a question about FSB. Memory manufacturers are marking memory which
is DDR PC3200 running @ 400Mhz. Shouldn't that be 200Mhz and 400FSB?

From what I understand, DDR gets twice the amount of data in one clock cycle
compare to SDRAM.

 

[Guest]

Archived from groups: alt.comp.hardware.overclocking.amd (More info?)

FSB - Front Side Bus, not memory
Real clock for PC3200 - 200Mhz, DDR gives double transfer rate - 400Mhz

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"chris" <chrisNOTSPAM@NOYB.com> wrote in message
news:FJWdneO887CSYkbfRVn-1g@magma.ca...
> Hello:
>
> I have a question about FSB. Memory manufacturers are marking memory
> which
> is DDR PC3200 running @ 400Mhz. Shouldn't that be 200Mhz and 400FSB?
>
> From what I understand, DDR gets twice the amount of data in one clock
> cycle
> compare to SDRAM.
>
>

 

[geoff]

Archived from groups: alt.comp.hardware.overclocking.amd (More info?)

"chris" <chrisNOTSPAM@NOYB.com> wrote in message
news:FJWdneO887CSYkbfRVn-1g@magma.ca
> Hello:
>
> I have a question about FSB. Memory manufacturers are
> marking memory which is DDR PC3200 running @ 400Mhz.
> Shouldn't that be 200Mhz and 400FSB?
>
> From what I understand, DDR gets twice the amount of data
> in one clock cycle compare to SDRAM.

yup
for DDR:

PC1600 = 100/200 mhz
PC2100 = 133/266 mhz
PC2700 = 166/333 mhz
PC3200 = 200/400 mhz

the PC3200 bit means maximum theoretical bandwidth, that is, a stick of ram
running at 400mhz can transfer 3200 meg bytes of data per second, hence the
pc number

to identify ram, look for mainly the PC number, and confirm with the mhz
rating

 

[Guest]

Archived from groups: alt.comp.hardware.overclocking.amd (More info?)

On Mon, 18 Jul 2005 15:12:43 -0400, chris wrote:

> Hello:
>
> I have a question about FSB. Memory manufacturers are marking memory which
> is DDR PC3200 running @ 400Mhz. Shouldn't that be 200Mhz and 400FSB?
>
It should be 200MHz. It has nothing to do with the FSB as ram has it's own
bus. The 400MHz is bogus marketing BS. The true bandwidth is right in the
PC3200 number. 64bits x 200MHz x2 (ddr)= 25600Mbps / 8= 3200MBps. You will
see many people that will argue that using 400Mhz is correct, but that's
just BS from people that really don't understand the data rates (400Mbps
per line) can't magically be changed to MHz just because it looks good.
Would you call a 56Kbps modem a 56KHz modem? No. Same thing applies.

> From what I understand, DDR gets twice the amount of data in one clock
> cycle compare to SDRAM.

And you understand it correctly.

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