confused about ram MHz

[lenzz]

Hi
I’m a little confused about ram MHz. I was under the impression that if your cpu is 1066 then your ram needs to match that in order to fun at full capacity. But from what I have been reading on these forums I now believe that if I am using a Q6600 that I could be using PC6400, and that I do not require pC8500 which runs at 1066 MHz.

Am in correct in this assumption.

 

[mame]

No thats completly wrong. a 1066fsb CPU has a default fsb of 266 (quad-pumped). Really you would need RAM that can run at least 266mhz because the lowest speed you can run the memory is 1:1 to the FSB

 

[lenzz]

No thats completly wrong. a 1066fsb CPU has a default fsb of 266 (quad-pumped). Really you would need RAM that can run at least 266mhz because the lowest speed you can run the memory is 1:1 to the FSB

so you are saying that i do need pc8500 ram.

 

[uZi]

No, you'd need minimum PC4200 to run at 1:1 @ 266 FSB.

However, on a higher divider you could run higher speeds. Or if you overclock your FSB you'll need higher spec ram to run 1:1.

 

[mame]

With pc6400 you could overclock that CPU to 3.6ghz before you would have to start overclocking the memory aswell. Which would be:

400*9 = 3600 MHz, RAM 1:1 (FSB to MHZ) 400mhz

Any higher and the memory has to run faster

 

[lenzz]

With pc6400 you could overclock that CPU to 3.6ghz before you would have to start overclocking the memory aswell. Which would be:

400*9 = 3600 MHz, RAM 1:1 (FSB to MHZ) 400mhz

Any higher and the memory has to run faster

ok so i am currently using 2gb of pc 8500 witch is 1066mhz. so if i am understanding this right i could set the ram to run at 800mhz and overclock the cpu without any performance hits from the ram.

 

[The Running Man]

depending on your mobo u can have the fsb of the cpu and ram split.

im running a 7;10 divider, my ram @ 1000 and my cpu at 350 which is 700, (which is 1400 quadpumped)
n

 

[lenzz]

depending on your mobo u can have the fsb of the cpu and ram split.

im running a 7;10 divider, my ram @ 1000 and my cpu at 350 which is 700, (which is 1400 quadpumped)
n

thanx. ok so as long as my ram is between 800 and 1066 and i dont overclock above 3.6 then i shouldnt need to worry about my ram underperforming.

 

[The Running Man]

exactly yea, you could run at either;

400fsb C2Q 9*400mhz = 3.6
6400 ram = 400mhz (which is actually 800mhz)

= linked 1:1

if you got 8500 ram (which runs at 1066)
400fsb C2Q 9*400mhz = 3.6
8000 ram @ = 500mhz (which is actually 1000mhz)

= 8/10 divider ram unlinked.

you could drop the cpu multiplier to 8 and run a 500mhz bus if it can do that to get it linked, or underclock the ram.

 

[Reality|Bites]

Your CPU has an actual FSB of 266Mhz x 4
PC8500 runs at a actual speed of 533MHz x 2

to run your memory in sync with your FSB you have to run your memory at half it's rated speed, 266Mhz x 2.

Forget all the marketing rated speeds. Look at the actual real speeds.

This is where you are getting confused.