Monst3r

im totally confused.. all i see are numbers.. So i went to the x9 multiplier chart then went to ddr2-800 then went to fsb 260 as it doesnt say 266 for my duo.. Then i went to the last number it says 936? what does this number mean.. Only thing ive never learnt with overclocking as my brain just wont pick up on it.. i really wanna learn this so i can push my rig and my future rigs to their limits

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Monst3r

Like say if my fsb:ratio was 2:3 since i have a fsb of 266 i would 266/2=11 so my FSB ratio would be 266: (How do i work out this part of the ratio) totally confused

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kpo6969

http://www.anandtech.com/mb/showdoc.aspx?i=3208&p=4

Monst3r

sorry but i still dont understand it dammit.. im gonna need a video or something lol

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kpo6969

2 quick examples (getting late)
E8400 (333 FSB stock)
I run @ 3.6 = 400 FSB
DDR2 ram 800mhz (400x2)
400mhz x2 (cpu) = 800mhz=400mhz x2 (ram) = 800mhz (ram) = 1:1 divider 800/800
400mhz x2 (cpu) = 800mhz=500mhz x2 (ram) = 1000mhz (ram) = 5:4 divider 1000/800

evilspongebob72

they way gigabyte do it is just easier

2, 2.4 ....

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Monst3r

add me on msn d2_punk69@hotmail.com need some help big time lol

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WBaS

Are you overclocking an AMD system or Intel? They do memory 2 different ways. These charts are meant for AMD ONLY and DDR2 memory. So lets say your using a x15 cpu multi and have your ram set as ddr2-800 in the bios. That means you need to use the last chart and the last column of the chart. At stock speeds, the AM2 chips use a FSB of 200. So now you look at the first row in the last column and should see 750. This means your ram is running at 750Mhz effectively. Now if you overclock your cpu by using a FSB of say 260, then your ram is now running at 975Mhz.

For Intel systems, things are a little different (at least until Nehalem core comes out). For Intel, their cpus use different starting FSB's and are "quad" pumped. For example, some chips have a 333FSB and are quad pumped (333x4= about 1333Mhz, for a total FSB). So if your fsb:ram ratio is set to 1:1, your memory will run at 1333Mhz. If you set your ratio to 1:2, then your ram will run at half the total FSB value (1333Mhz/2=667Mhz). Or if the ratio is set 2:3, your ram will run at 1333*(2/3)=889Mhz Now for the cpu speed... if your cpu uses a 9x multi, then your cpu will be running at 333x9= about 3.0Ghz.

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"Give a man a fish, feed him for a day. Teach a man to fish, feed him for a lifetime." -Lao Tzu

noobdown

also if you refer to the chart. where each speed is the is a /#. if you take that number and devide it by your cpu speed, it will give you the speed your ram is running at. hience the divider.
example
3000mhz(cpu) divided by 8 = 375mhz. because it ddr times it by 2 = 750.

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ATi 4830 Club

Monst3r

nevermind i worked it out.. DRAM Final Clockrate = (2 x FSB)/DividerExample, 2/3 divider @ 400 MHz FSB: (2 x 400 MHz)/(2/3) = 1,200 MHz

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