Multipliers and frequencies?

[kc252]

Ok, I am not an idiot, I just have not been explained all the multipliers and frequencies that well yet. I need to know, well, first of all, how each works for CPU, memory and things. And I need to know if there is any point getting ddr 400 memory for a 2.4 533 fsb p4 system, if the granite bay chip is synchronous and says it only supports 266 speed memory. How does the mulitplier and frequency work in conjunction with the memory frequency and everything?

And what are all the frequencies that go with the memory names?

266 - 2100
300 - 2400
333 - 2700
366 - 3000? 2900?
400 - 3200
433 - 3500
466 - 3700

correct or no?

Thanks for any help

•kc252•

 

[kc252]

But overclocking the cpu to 200 is very very high isn't it? I would be pushing the limits even if I got a really good cooling system (ie watercooling) right? that's like 3.6 ghz. !!! And, if I get lower speed memory, like ddr 266, like the granite bay E7205 supports and I run it in dual channel mode, will I get better performance, than running highspeed memory in a chipset that allows async? How much performance gain will I get with that 266 memory in dual in sync, compared to some 400 in single channel without sync?

 

[lhgpoobaa]

To get the ram speed, take the base Mhz of the ram and multiply it by 8 then 2.
i.e. PC2700
166.6 x 8 x 2 = PC2666 ~ PC2700. (rounded up)

<b><i>The Very Hungry Caterpillar</i> - George W. Bush's favorite childhood book.
Note: This book was first published a year after Mr Bush graduated from College.</b>

 

[bum_jcrules]

Poobaa is correct. This is just so you can see it in technical terms because that is the way you will read all over the net.


Bus Speed x Bus Width x bits per cycle = Bandwith

<A HREF="http://ocsystem.com/calmemban.html" target="_new">See this simple explination.</A>

In Poobaa's example:

166.6 is the bus speed. (500/3MHz is the exact for 166.667MHz)

8 is the width if the data pathway in bytes. (8 bits to one Byte and SDR SDRAM and DDR SDRAM use 64 bit pathways.)

2 is the number of bits per cycle wave. (DDR is Double Data Rate - 2 bits per cycle and SDR is Single Data Rate - One bit per cycle.)

500/3MHz x 8 Bytes x 2 bits per cycle = 2666.667 MegaBytes per Second.



<b><font color=red>Fredi</font color=red> <font color=red>Fredi</font color=red> He's our man! If he can't do it no one can!</b><P ID="edit"><FONT SIZE=-1><EM>Edited by Bum_JCRules on 01/14/03 10:52 PM.</EM></FONT></P>