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Multipliers related to temp and speed?

post #1 of 5
Thread Starter 
Hi!

We have two options:

23x174
21x191

to achieve 4.00Ghz

Memory @ 1600

Using 23 means that the WHOLE system will run slower than 19 because the bclk is smaller. correct?

Is 19x better in terms of temperature / vcore required?

In general, is there a preference between the two options and why???
Edited by earthdog - 12/21/10 at 2:28am
post #2 of 5
Quote:
Originally Posted by earthdog View Post
Hi!

We have two options:

23x174
19x191

to achieve 4.00Ghz

Memory @ 1600

Using 23 means that the WHOLE system will run slower than 19 because the bclk is smaller. correct?
Not necessarily, but usually it's like that. The thing is the bus speed doesn't really limits the speed of a system (unless it's a multi-processor server), so it may not matter if it is 174 or 191. If you can keep the RAM at the same speed for the two different bclk, they should provide similar/identical performance.
Quote:
Is 19x better in terms of temperature / vcore required?
No, usually it's worse. Since you push the motherboard more (higher bclk) you tend to push the whole system harder. For the same processor clock speed using a higher multiplier (and lower bclk) means lower voltage, temps and power consumption.
Quote:
In general, is there a preference between the two options and why???
Unless you see a decent performance benefit of using the higher bclk, you should avoid it. It pushes a motherboard harder, usually consumes more, so this can only be justifiable if the computer is faster.

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post #3 of 5
Thread Starter 
I made a mistake its not 19x191 but 21x191 ...

1.both multi's will require the same VCORE voltage ???

(they are producing the same freq after all)....

I understand that other voltages will be slower with the lower bclk...
post #4 of 5
The thing is that you need a voltage for the cpu and another voltage for the VTT.
Higher BCLK require more VTT voltage, while keeping the BCLK at lower frequency would require less IMC voltage, and maybe a bit more cpu vcore.
    
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post #5 of 5
Thread Starter 
Quote:
Originally Posted by jak3z View Post
The thing is that you need a voltage for the cpu and another voltage for the VTT.
Higher BCLK require more VTT voltage, while keeping the BCLK at lower frequency would require less IMC voltage, and maybe a bit more cpu vcore.
that means that even going to 23x174 i would get more heat from rising vcore (maybe) and maybe lower if i drop qpi/vtt due to lower freq....

so it should be the same...so there is no reason to go to 23x since i dont want to do extreme oc (i mean if i hit wall to my bclk then i would go to higher mult)

is this correct?
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