Newsgroup: it.comp.hardware.cpu
Titolo: frequenze di bus e memorie

Vorrei sapere visto che oramai esistono diversi bus a 266, 333, 400,
533, 800 e 1000 volevo sapere se per ogni processore è necessario
esattamente il tipo con quel bus o se memorie di frequenza maggiore si
adattano automaticamente a quella inferiore.
Ad esempio su un processore con frequenza di bus di 400 Mhz posso
mettere memorie da 533, 800 o 1000?

 mettere memorie da 533, 800 o 1000?
Certo.
-- 
 PaRRoT from Linux (user #302069) |     L I N U X       .~.
Athlon XP 1700+ @2406MHz          |     The Choice      /V\
Radeon 9600PRO @524/664           |      of a GNU      /( )\
Gillette Mach 3 @Mach 3 Turbo     |     Generation     ^^-^^

Certo.
e questo anche se nel caso di un notebook nel c'è già della memoria su
motherboard a 266?

 Se mi trovi una memoria a 1000 ti faccio la statua d'oro!
beh, se č 1 ghz effettivo allora ok, ma se č 1 ghz ddr [quindi 2x500] č 
piů che fattibile. si č arrivati alle ddr600, fai te...
-- 
"Welcome to the horror of the revelation
Tell me what you think of your savior now
I reject all the biblical views of the truth
Dismiss it as the folklore of the times
I won't be force fed prophecies
 From a book of untruths for the weakest mind
I keep the bible in a pool of blood
So that none of its lies can affect me"
Slayer/New Faith/God hates us all

Aggiungo:
Da tomshardware (
http://www.tomshardware.com/motherboard/20030508/
)
Front Side Bus And Memory Clock 
No two clock speeds are alike. Anyone who's had anything to do with processors,
chipsets and main memory knows that there are various "areas" that can be
clocked to operate at different speeds. One of these is the processor
speed, also called the internal or CPU clock speed. The other is the Front
Side Bus (FSB), which represents the link between the processor and the
Northbridge. In today's Pentium 4, you'll find an FSB of 400, 533 or 800
MHz (achieved by transferring four bits per cycle per quad-data-rate based
on an underlying clock speed of 100, 133 or 200 MHz), or 266 and 333 MHz
with the Athlon XP (per double-data-rate with two bits per clock cycle
based on 133 or 166 MHz). 
Finally, the bus to the main memory is also a factor in overall
performance. As a rule, performance assessment is geared to the latest in
memory technology. In the past, the yardstick was the SDRAM with up to 133
MHz; nowadays it's Double-Data-Rate SDRAM with a limit of 200 MHz. With
DDR, the effective performance is equal to the resultant effective clock
speed of 400 MHz. Hence the DDR400 label - or PC3200, assuming a bandwidth
of 3200 MB/s. 
Da un altro sito a caso
(
http://help.lockergnome.com/index.php?s=cd8612b5dea8ba88ba8c76005bebf218&showtopic=25417
):
The number rating of RAM (e.g. PC2100) is the maximum amount of data that can
be transfered each second. This is rated at Giga-Bits per Second (GB/s)
and is called the Memory Bandwidth.
Front-Side Bus Frequency (Mhz) * bus bit-rate (which is 16-bit) = Memory Bandwidth
PC2100 RAM transfers data at 2128GB/s across a 16-bit FSB running at 133MHz.
PC3200 RAM transfers data at 3200GB/s across a 16-bit FSB running at
200MHz.
Devo ringraziare gli addetti del marketing becero per aver coniato il
termine DDR400 per indicare quello che in effetti è un 200MHz DDR.