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X58 Component Issues regarding FSB

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Cygone   11-11-2009 at 08:43:36 PM

Good afternoon,

I need a little help in regards to memory speed, eg.

http://www.ebuyer.com/product/152637 < This is rated at 1333MHz 9/9/9/24
http://www.ebuyer.com/product/178947 < This is rated at 1333MHz 7/7/7/20
http://www.ebuyer.com/product/152640 < This is rated at 1600MHZ 9/9/9/24

So the ratings at the end 9/9/9/24 etc, are the speed the memory clears down, time it takes to write and read and all that stuff, and yes I know lower numbers the better.

The query I have is in regards to the 1333/1600 MHz ratings, now I know this is the speed at which the memory can send information to CPU etc, does this have any relation to the FSB/QPI on a processor has? if a x58 can only run on 1333Mhz, why produce a 1600MHz memory?

Is it so that you can overclock the processor and still be winin margins of the memory?

Im prolly not explaining myself very well here so i appoligise for that, hopefully someone will understand where I am going with this.

Help appreciated.

Ta

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dunklegend   11-11-2009 at 09:51:30 PM
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Read the stickies in the Overclocking forum, that will answer most of your questions.

------------------------------ Never argue with a fool, people might not know the difference
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Cygone   11-11-2009 at 10:06:00 PM
- 0 +

Think I figured it out.

i7 processors are quad pumped. They run at stock at 1066MHz,

RAM is dual pumped (wrong phrase I know), so 1066MHz RAM runs at 533MHz FSB,

The processor is quad pumped, so 533/4 = 133, with a 20x multiplyer on an i7-920, its 20*133 - 2666MHz or 2.66GHz

If I wanted to over clock my processor, I need faster RAM to keep at the 1:1 ratio between RAM and Processor.

So with 1333MHz RAM, 1333/2 = 666, 666/4 = 166, 166x20 = 3320 or 3.33GHz,

I7-920 can clock to 4GHz on air.

So with 1600MHz RAM, 1600/2 = 800, 800/4 = 200, 200*20 = 4000 or 4.0GGHz.


Message edited by Cygone on 11-11-2009 at 10:09:37 PM
Reply to Cygone
dunklegend   11-11-2009 at 10:18:20 PM
- 0 +

See, there you go

------------------------------ Never argue with a fool, people might not know the difference
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