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Questions in relation to DIMM, RAM and CPU "FSB"

post #1 of 14
Thread Starter 
Hi,

I must said that I didn't had time to do too much research on this topic and I hope my questions will be clears.

My first question is how to calculate the speed of RAM VS the CPU "FSB" (in intel I series of CPU)?

In the "old" time you used the FSB of the CPU and MB to do so; now I'm very confused about how to achieved it?

What is DIMM exactly, I quickly view that it's related to the PCI Express but in what way?

I believed those 2 questions will help grasp the new way of doing things (with the I series of CPU).

Thank you.
    
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post #2 of 14
RAM Clock = Base Clock * Multiplier * 2

DIMM = Dual In-line Memory Module. It a name for RAM and has nothing to do with PCIe.
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post #3 of 14
EG of RAM clock

133Mhz BCLK x 5 x 2 = 1333Mhz
133Mhz BLCK x 6 x 2 = 1600Mhz
133Mhz BCLK x 7 x 2 = 1866Mhz
133Mhz BLCK x 7.5 x 2 = 2000Mhz
133Mhz BLCK x 8 x 2 = 2133Mhz
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post #4 of 14
Thread Starter 
Oups my bad... I meant DMI not DIMM...

Sorry for the confusion.

To achieve a ratio CPU:RAM of 1:1 how to I do that with the new I series?
    
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post #5 of 14
With the Core i3/5/7 series you dont need to have a CPU:RAM ratio of 1:1

Why do you want 1:1?

DMI = Direct Media Interface and is the link between the nortbridge and southbridge of any Intel system since the 9xx series chipsets.

It has similar characteristics to the PCI-E bus but is not directly related. Ie both use multi lane and differential signalling to form point to point links.
Edited by Mitche01 - 3/8/11 at 6:45am
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post #6 of 14
Thread Starter 
Quote:
Originally Posted by Mitche01 View Post
With the Core i3/5/7 series you dont need to have a CPU:RAM ratio of 1:1

Why do you want 1:1?
I'm used to tweak with the FSB "platform" so I'm trying to get a equivalent in overall performance with the new I series.

So IF I've understood correctly the RATIO CPU / RAM is not as important as it used to be?

They're now more or completely independent?
    
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post #7 of 14
Quote:
Originally Posted by Nivis Tigridis View Post
Oups my bad... I meant DMI not DIMM...

Sorry for the confusion.

To achieve a ratio CPU:RAM of 1:1 how to I do that with the new I series?

DMI = Direct Media Interface. It connects the Soutbridge to the Northbridge or PCH to CPU.
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post #8 of 14
Thread Starter 
Quote:
Originally Posted by DuckieHo View Post
DMI = Direct Media Interface. It connects the Soutbridge to the Northbridge or PCH to CPU.
That's what replace the FSB, right?
    
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post #9 of 14
NO the QPI (quick path interconnect) replaces the FSB.

There is a Base Clock (Stock = 133Mhz for the I series) that is used a a reference for all other bus/frequencies on the motherboard/RAM/CPU.

This allows users to alter things independently.

However example of things still linked by raising the base clock:

CPU frequency
RAM Frequency
QPI

You can alter the multipliers of each of these in turn to get the best performance from each element on you system.
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post #10 of 14
Thread Starter 
Quote:
Originally Posted by Mitche01 View Post
NO the QPI (quick path interconnect) replaces the FSB.

There is a Base Clock (Stock = 133Mhz for the I series) that is used a a reference for all other bus/frequencies on the motherboard/RAM/CPU.

This allows users to alter things independently.

However example of things still linked by raising the base clock:

CPU frequency
RAM Frequency
QPI

You can alter the multipliers of each of these in turn to get the best performance from each element on you system.
Ok thanks for all of you, I've got a better understanding of all the new changes.

1 Question remain for me in RAM related, is it better to get Higher speed or lower CL?
A) When you building a stock config
B) When you plan to OC the Processor

Thank you again.
    
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