Does Asus A8N have divider problems??

[nheather]

I'm running my Asus A8N-E with the following settings

Cpu Frequency = 250MHz
Memory Clock (i.e. Divider) = 333MHz
HTT Multiplier = x4

I would expect the memory speed to be 250 x 333/400 = 208MHz

But CPU-Z records memory frequency as 196MHz

To achieve this, the 333MHz divider would have to be 0.784 instead of 0.8325 (a 6% error).

Does anyone know if the A8N or CPU-Z is at fault?

Cheers,

Nigel

 

[Nutbusta]

It depends on the mutliplier of your CPU. THe maths are a bit complex (and I don't understand it) but you can find it all on DFIStreet...

...or you can google and download a little program called "A64MemFreq11.exe", which is fantastic and takes a hell of a lot of guesswork (or maths) out of overclocking.

 

[ted34]

I'm running my Asus A8N-E with the following settings

Cpu Frequency = 250MHz
Memory Clock (i.e. Divider) = 333MHz
HTT Multiplier = x4

I would expect the memory speed to be 250 x 333/400 = 208MHz

But CPU-Z records memory frequency as 196MHz

To achieve this, the 333MHz divider would have to be 0.784 instead of 0.8325 (a 6% error).

Does anyone know if the A8N or CPU-Z is at fault?

Cheers,

Nigel

So many people get that wrong - download memfreq and it will calculate it all for you. There is a formula at dfi street that you can use though but requires thinking so memfreq easier

 

[nheather]

Found the answer. The logic is sound, the MoBo tries to create a divider equal to 333/400.

But as pointed out, the reality is dependent on the CPU multiplier and simply uses whole number ratios to get as close as it can - really simple when you know what it is doing - but really disappointing in my case.

So 166(333) memory multiplier should be 333/400 = 0.8325

With CPU multi = x11, actual mem multi is 11:14 = 0.7857
With CPU multi = x10, actual mem multi is 10:12 = 0.8333

Cheers,

Nigel