dual channel memory

[benjamat]

I am ashamed to say I have lost track a little with the workings of the DCM architecture.
What happens for instance with a mobo - P4P800 Deluxe with the following memory available -

1 - 1 x Crucial PC2100
2 - 2 x Crucial PC2100
3 - 1 x Crucial PC2700
4 - 2 x Crucial PC2700
5 - 1 x Crucial PC2100 / 1 x Crucial PC2700

All modules of the same type but not so called "matched"

I have been a little pre occupied lately and need to get up to scratch.

I would be very gratefull for any thoughts of pointers to relevant articles.

many Thanks.

 

[benjamat]

Sorry, a bit more,

I understand the following

PC2100 = 133MHz X 2 (for DDR) = 266

PC2700 = 166MHz X 2 = 333

PC3200 = 200MHz X 2 = 400

So what fsb speeds etc do you actually achieve on an 800 board with 2100 etc, do you need PC3200 to achieve 800?

Thanks

 

[Vette73]

Intel cpu's 400 = 100Mhz, 533 = 133Mhz, and 800 = 200Mhz

AMD cpu's 200 = 100Mhz, 266 = 133Mhz, 333 = 166Mhz, and 400 Mhz = 200Mhz

PC2100 = 133 Mhz
PC2700 = 166Mhz
PC3200 = 200Mhz

 

[benjamat]

Thanks for reply but still feeling dim.

If I run with 2 x 2700 this = 2 x 166 = 333 mhz Memory

I read of peop[le running at 800 and 1000 with synchronised memory, ie- same speed as bus but using 2.4gz cpu (b not necessarily c )

I am failing to see the link as to how this is achieved, yo cannot overclock a 400mz cpu to 1000.

 

[benjamat]

Took a while but finally got there ** Quad Pumping **

200 = 800

So perhaps this is right.

Cpu clocked at 125 = 500 fsb

memory at 266 = 524 mhz

So a 133 cpu clocked to 150 = 600 ( 150 x 4 )

PC2700 memeory will run at 333mhz = 666 (dual channel )

Finally to run any system at 800 mhz and match the memory speed you would have to do the following

133 o/c to 200 ?? with PC3200 memory. ?
P4C-800 with PC3200
133 o/c to 200 ?? with PC2700 memory O/C 166 to 200

1000 mhz system =

P4C-800 O/C to 250 mhz = 1000 ( quad pumped )
PC3200 O/C to 250 = 500 ( DDR ) x 2 = 1000

Voila How on earth do they manage to get 845 systems up to 800 or even 1000 ?

Many Thanks