Questions about FSB

[Luis]

Hi!

Can anyone help me solve this confusion?

(sorry about my bad english )

I have this motherboard: Intel Desktop Board D845GLLY

And the specs are:

This MotherBoard is designed for Celeron and Pentium 4 processors

The FSB is 400 MHz.

And uses PC133 SDRAM (It's TRUE... ordinary SDRAM, NOT DDR!!!!)

HOW THE HELL CAN IT BE???


I've read in some web pages that the Pentium 4 uses a FSB with one of the following speeds:

Pentium 4 A : 400 Mhz. FSB Speed = 4 (quad pumping) x 100 MHz. (System clock speed)
Pentium 4 B : 533 Mhz. FSB Speed = 4 (quad pumping) x 133 MHz. (System clock speed)
Pentium 4 C : 800 Mhz. FSB Speed = 4 (quad pumping) x 200 MHz. (System clock speed)

But I have a few questions:


where in the hell the system clock is?
on the motherboard maybe?

Then, How the RAM can operate at a different speed?
the ram has its own clock?

This question remembers me this other:

I've read that RAMBUS RIMM is is only double-pumped but it's very fast,
so it does 2 cycles when the FSB does 1 and in this way compensate the difference.

Again the same question:

How the RAM can operate at a different speed?
the ram has its own clock?

Why they say "The processor have the 400 MHz FSB?
the processor has its own clock or it's the same one of the MotherBoard?
the processor could be at different FSB speed than the MotherBoard?

My MotherBoard was designed like this by some kind of STUPID guy or what?
there is a huge bottleneck in my system?

THANX

 

[jlanka]

RAM can run at any speed from it's "rated" speed down. Sometimes you can also "overclock" it higher than it's rated speed. But there's no guarantee overclocking will work.

Running RAM at less than it's rated speed WILL work.

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[Luis]

Oh... I see.
then RAM has its own clock?

(btw tank you ~_~)

 

[jlanka]

the RAM clock is driven by the settings you choose in the BIOS

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[Luis]

the RAM clock is driven??

(Sorry, I really don't understand what "driven" means...
my english is very poor)

So it's the same clock of the Mother board but with some kind of divisor?

or it's another real clock in the RAM stick that can be configured via the BIOS?

 

[jlanka]

it's the same clock of the Mother board but with some kind of divisor.


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[Mitch007]

Hope you got what you needed from CPU post you place, for some of these guys (postaholics), a little info is dangerous!!

MIS645Ultra/P42.4@2.8Gig/2*Corsair 256MBit CL2-2-2-7XMSLLPT PC3200 DDR RAM/450W Enermax PSU/1*40Gig 7200rpm Wes-Dig/1*20Gig 7200 Hitachi Disk/GeF4 Ti4200 XFX Turbo 670/250 Ram/Core MHz.

 

[jlanka]

not quite sure I understand your point. I realize the original poster cross posted it. Is that what you're referring to?

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[sparky853]

Some motherboards allow you to run the RAM faster than the system bus.

For example, I had a P4 board with a 533MHz FSB (133*4=533) that ran the RAM at 333MHz (166*2=333).

It is usually recommended to run the RAM in sync, or at the same speed, as your FSB.

XP2800+, Abit NF7, 1GB Dual-Channel DDR333, ATI R9800PRO 128MB, SB Live! 5.1 Digital, TT PurePower 420W, Samsung 120GB, Maxtor 120GB, LG DVD+-R/RW, WIN2K PRO SP4

 

[Crashman]

With the P4, it's better to run single channel RAM at 2x the CPU bus. Synchronous clock speed is less of an advantage than synchronous bandwidth. But AMD has overtaken the enthusiast market so well that people can't seem to remember these things.

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