I've been beating myself over the head with this for a while and can not figure out the formula.. I suck at math, so maybe someone can better explain this to me.
This is part of a paragraph in an internet article about A64 OC'ing in relation to memory, etc..
"For all intents and purposes, the memory divider is merely a ratio of HT bus speed to memory speed. The 200 MHz option is a 1:1 ratio, meaning that an HT bus speed of 200 MHz will yield a memory speed of 200 MHz. The next most common option is 166 MHz, which is a 6:5 ratio. If your HT bus speed is 200 MHz, and you use this ratio, you will get a memory speed of 166 MHz. It really is quite simple, but you will most likely need a calculator to do some calculations once you're tweaking things. For instance, using the 166 MHz divider (6:5), you have to run your HT bus at 240 MHz in order to achieve the standard 200 MHz memory clock again...."
My question is, how the heck do I calculate this ratio myself? Having a problem figuring out the math for my current settings. If my HT in this case is 260 (CPU @ 2.60 Ghz), and with my current [temporary] DDR400/200Mhz RAM I have to lower it to DDR266/133Mhz in the BIOS, and during POST it runs at 173 Mhz.
What do I multiply the 133 by to get 173? How do I calculate what the memory will run at for a given CPU or HT freqency? For example, what if I bumped it up to 270 (2.7 Ghz).. What would it be then; how much closer to the rated 200Mhz?
TIA
This is part of a paragraph in an internet article about A64 OC'ing in relation to memory, etc..
"For all intents and purposes, the memory divider is merely a ratio of HT bus speed to memory speed. The 200 MHz option is a 1:1 ratio, meaning that an HT bus speed of 200 MHz will yield a memory speed of 200 MHz. The next most common option is 166 MHz, which is a 6:5 ratio. If your HT bus speed is 200 MHz, and you use this ratio, you will get a memory speed of 166 MHz. It really is quite simple, but you will most likely need a calculator to do some calculations once you're tweaking things. For instance, using the 166 MHz divider (6:5), you have to run your HT bus at 240 MHz in order to achieve the standard 200 MHz memory clock again...."
My question is, how the heck do I calculate this ratio myself? Having a problem figuring out the math for my current settings. If my HT in this case is 260 (CPU @ 2.60 Ghz), and with my current [temporary] DDR400/200Mhz RAM I have to lower it to DDR266/133Mhz in the BIOS, and during POST it runs at 173 Mhz.
What do I multiply the 133 by to get 173? How do I calculate what the memory will run at for a given CPU or HT freqency? For example, what if I bumped it up to 270 (2.7 Ghz).. What would it be then; how much closer to the rated 200Mhz?
TIA
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