- Joined
- Oct 27, 2005
- Location
- Lake Village, IN 46349
Alot of people probably don't know that A64 RAM dividers aren't clear cut on the calculation of the actual RAM speed.
For insance:
My old Opty 165 system ran at 334HTT x 9 (multi) for 3006Mhz. The RAM divider was set at 166 (5/6). This made for an actual RAM speed of 273Mhz (not 278 as you would logically calculate)
Here is how you figure that out:
Divisor = CPU Clock Speed / (RAM Divider * HTT)
10.8 = 3006Mhz / ( 5/6 * 334Mhz)
Then round the Divisor to the next highest whole number. (not using standard decimal rounding, if it is 9.01 you still round to 10)
So for my example, the Whole number divisor would be 11
Then:
Actual RAM speed = CPU Clock Speed / Whole numbered divisor
273.27Mhz = 3006Mhz / 11
So as you can see, it can be a pain to figure these things out when you are overclocking. I was trying to remember the speed at which my memory was running back then, but I had forgotten how to calculate these dividers so I searched for a calculator....and I found this calculator. It makes things real easy. So I hope this helps someone:
View attachment A64 MemFreq v1.1.zip (10.8 KB)
For insance:
My old Opty 165 system ran at 334HTT x 9 (multi) for 3006Mhz. The RAM divider was set at 166 (5/6). This made for an actual RAM speed of 273Mhz (not 278 as you would logically calculate)
Here is how you figure that out:
Divisor = CPU Clock Speed / (RAM Divider * HTT)
10.8 = 3006Mhz / ( 5/6 * 334Mhz)
Then round the Divisor to the next highest whole number. (not using standard decimal rounding, if it is 9.01 you still round to 10)
So for my example, the Whole number divisor would be 11
Then:
Actual RAM speed = CPU Clock Speed / Whole numbered divisor
273.27Mhz = 3006Mhz / 11
So as you can see, it can be a pain to figure these things out when you are overclocking. I was trying to remember the speed at which my memory was running back then, but I had forgotten how to calculate these dividers so I searched for a calculator....and I found this calculator. It makes things real easy. So I hope this helps someone:
View attachment A64 MemFreq v1.1.zip (10.8 KB)