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memory question

post #1 of 11
Thread Starter 
hey guys, i am just wondering did i calculating the memory speed right?

i have htt 307 and runs 133/200 as mem divider, so the memory speed should be 307*133/200 = 204

but cpu-z shows the memory speed as 197.4 mhz



did my calculation wrong or it is normal cpu-z shows lower memory speed?
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post #2 of 11
Your calculations are correct. The difference is in rounding off of the digits. Your calculations are rounding off in lesser digits than the computer, that's all.

R
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post #3 of 11
Quote:
Originally Posted by Ropey
Your calculations are correct. The difference is in rounding off of the digits. Your calculations are rounding off in lesser digits than the computer, that's all.

R

---------------WHY?
What is the standard here?
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post #4 of 11
Thread Starter 
Quote:
Originally Posted by Ropey
Your calculations are correct. The difference is in rounding off of the digits. Your calculations are rounding off in lesser digits than the computer, that's all.

R
thanks for the fast response

so the actual memory speed i am running now is what it appears in cpu-z?
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post #5 of 11
Quote:
Originally Posted by Oknilp
---------------WHY?
Because the numbers are not exact. The multiples are not 33/66/133/266/333/400....

They are not integers. They have fractional components. 33.33333... and 66.66666...

Thus the calculation of the actual digits done by the computer will be different than your calculations as you round the digits off more. For example, some are 33.33 and some are 33.3 and some are simply dividing by 33.

Thus the outcome will be somewhat different. CPU-z will give you a far better numerical reading than your own calculations.

R
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post #6 of 11
To complete what ropey just said the clock aren't wery stable in time. You may observe slight variations for the HTT speed, for ex to see it balancing between 305-307MHz althow you didn't cange anything. This is normal, and together with the computation errors generated by the non-integer numbers can lead to a significant errors.
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post #7 of 11
Plus also worth noting is the fugures may also change as well with the fluctuation of VCore voltage
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post #8 of 11
Quote:
Originally Posted by dragosmp
You may observe slight variations for the HTT speed, for ex to see it balancing between 305-307MHz althow you didn't cange anything. This is normal, and together with the computation errors generated by the non-integer numbers can lead to a significant errors.
Quote:
Originally Posted by MjrTom
Plus also worth noting is the fugures may also change as well with the fluctuation of VCore voltage
What I spoke of was the "Memory Speed" fluctuations and in which the above two posts would not effect.

Quote:
Originally Posted by cool168
did my calculation wrong or it is normal cpu-z shows lower memory speed?
The initial question was addressing the fluctuations in the calculatations of DRAM speed and not voltage fluctuations. The above premises for voltage fluctuations and Multiple VID CPU fluctuations are correct. They are incorrect for this question though it is still useful information with regards to voltage fluctuations.

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post #9 of 11
Thread Starter 
Quote:
Originally Posted by Oknilp
---------------WHY?
What is the standard here?
so i found the "WHY" from other forum. here is the explaination.

166/200 is 5/6 divider...so you take your CPU multi (9) x 6 / 5 = 10.8 but you have to round up to the next whole number (you always round up...so even if the result is 10.2, that would be 11) which is 11, so your ram divider is 11. Now take the CPU speed (2700) and divide by 11 which = 245.45 which is the ram speed.
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post #10 of 11
Quote:
Originally Posted by kool168
hey guys, i am just wondering did i calculating the memory speed right?
Download AMD Calculator, it'll save you alot of time and explain alot. http://hardware.mcse.ms/archive26-2006-1-273657.html
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