Important questions about RDRAM & P4 .....

[Hossam]

Hello,

i wanna to know ...

1) what r the defference between this type of memory "PC800 & PC1066" ?

2) what r the best RAM for P4 ?

3) what happen when i use the p4 processor "bus 400" with SDRAM " bas 133" ?

4) what r the biggest bus for P4 processor ?

thanks in advance

 

[Wolfsraider]

lets see if i got you correct

1) what r the defference between this type of memory "PC800 & PC1066" ?

pc800 =3.2 ghz of bandwigth where as pc 1066 =4.2 ghz

pc 800 is about half the price of pc1066

2) what r the best RAM for P4 ?

depends on the user's preference

although rdram has better bandwidth than ddr,ddr also has many different speeds/bandwidths

some are almost on par with rdram

while rdram has better bandwidth's ddr is more widely used and considered future proof

3) what happen when i use the p4 processor "bus 400" with SDRAM " bas 133" ?

if you are refering to pc 133 sdram,the ram would not be the best choice as the p-4 needs more
bandwith than sdram can provide although this is a combination some users choose it isn't anywhere near the best choice again ddr or rdram are much better

4) what r the biggest bus for P4 processor ?
in reference there are two bus speeds 100x4(quad pumped)=400 mhz and 133x4(quad pumped)=533 with 533being the biggest

a good read can be foundhere although this is just one and many more(even better)can be found using www.google.com to search specific questions

hope this helps
mike

ps this isn't meant to be an end all answer after all its 3 am

 

[Hossam]

thanks very match Wolfsraider but i wanna to know thing

as i know it must the processor & the RAM have the same Bus ..... is this right

in detail

processor "bus 400" = Ram "bus 400"

but when i put Ram "bus 800"

processor "bus 400" < Ram "bus 800" in this case the bus of memory well decrease into 400

i hope u get what i mean

thanks

 

[fkloster]

No. PC-800 rambus is actually operating @ 400mhz so it is perfectly in sync with the P4's quad pumped bus (100mhzx4) PC-800 is called such because even though its actual frequency is 400mhz...data is traveling on both the rising and falling edges to create and 'effective' 800mhz ....

 

[GoodRevrnd]

.

 

[Hossam]

can u explain in details plz

or give me a site help me in this ....

sorry & thanks

 

[Hossam]

???

 

[CrazySaint]

Let me start with a little background info on how RAM works. Ordinary SDRAM only performs one memory operation per clock cycle, where was DDR RAM performs two memory operations per clock cycle (which is called "double pumping" since it does "double" of what SDRAM does) effectively doubling its speed. Therefore, DDR RAM with a FSB of 100MHz has an "effective" speed of 200MHz, because it performs as fast as ordinary SDRAM would if it were operating at 200MHz. RAMBUS memory, on the other hand, does four memory operations per clock cycle (which is called "quad pumping"), so some RAMBUS memory operating on a 100MHz FSB has an "effective" speed of 400MHz, since its four times as fast as ordinary PC100 SDRAM. In addition to the quad pumping, RDRAM has two memory channels, and requires two sticks of RAMBUS memory (one for each channel), which doubles its performance again, thus giving it an "effective" 800MHz or PC800. Remember, this is a simplification and there are other issues that effect memory performance and RAMBUS isn't four times faster than DDR memory (in fact, PC2700 DDR memory is only about 5% slower than PC1066 RDRAM memory on a P4), but I hope it clears things up a bit for you.