Could someone give me a quick explanation of what the 1:1 3:4 4:5 memory settings equit to in mhz at a given fsb?I refer to the p4pe mobo.I'm asking cause I have yet to work with a newer board but will be stepping up from my old cusl2-c sdram based system soon.
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Dividers
- Thread starter Chief
- Start date
dividers usualy mean at the rate your AGP( i think ) is running at according to your FSB.. well thats what it is for me..
1:1 woudl be that AGP is runnin at the same speed as the FSB ( if its 150 FSB, your AGP will be runnign at 150 ( which btw is not a good thing
)
3:4 would mean the FSB is divided by 4 then multiplied by 3 and thats the speed of your AGP ( there for if you have a FSB of 150 your AGP will run at 112)
and so on
1:1 woudl be that AGP is runnin at the same speed as the FSB ( if its 150 FSB, your AGP will be runnign at 150 ( which btw is not a good thing
)3:4 would mean the FSB is divided by 4 then multiplied by 3 and thats the speed of your AGP ( there for if you have a FSB of 150 your AGP will run at 112)
and so on
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- Apr 3, 2002
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Those settings are to set the speed of your memory in relation to the speed of your FSB (CPU).
CPU speed : Memory speed
1:1
133mhz / 1 = 133 ....133 x 1 = 133mhz memory speed
100mhz / 1 = 100....100 x 1 = 100mhz memory speed
3:4
133mhz / 3 = 44.3....44.3 x 4 = 177mhz memory speed
100mhz / 3 = 33.3....33.3 x 4 = 133mhz memory speed
4:5
133mhz / 4 = 33.25....33.25 x 5 = 166mhz memory speed
100mhz / 4 = 25....25 x 5 = 125mhz memory speed
Get it? These ratios should also apply during OCing as well...just plug in the CPU FSB and work with the applicable ratio being used to determine what your final memory speed is going to be. Ratios are handy for determining the Max CPU OC as you can relax the memory using the 1:1 ratio. Then if your memory is up to it...apply 3:4 or 4:5.
The P4PE you are considering I believe also has AGP/PCI lock...able to hold these busses at 66/33mhz no matter the FSB...most desirable for OCing.
These CPU:Mem ratios are getting more common amongst P4 DDR. Boards with SiS chipsets tend to have more ratios available...MSI648Max for example:
CPU speed : Memory speed
1:1
133mhz / 1 = 133 ....133 x 1 = 133mhz memory speed
100mhz / 1 = 100....100 x 1 = 100mhz memory speed
3:4
133mhz / 3 = 44.3....44.3 x 4 = 177mhz memory speed
100mhz / 3 = 33.3....33.3 x 4 = 133mhz memory speed
4:5
133mhz / 4 = 33.25....33.25 x 5 = 166mhz memory speed
100mhz / 4 = 25....25 x 5 = 125mhz memory speed
Get it? These ratios should also apply during OCing as well...just plug in the CPU FSB and work with the applicable ratio being used to determine what your final memory speed is going to be. Ratios are handy for determining the Max CPU OC as you can relax the memory using the 1:1 ratio. Then if your memory is up to it...apply 3:4 or 4:5.
The P4PE you are considering I believe also has AGP/PCI lock...able to hold these busses at 66/33mhz no matter the FSB...most desirable for OCing.
These CPU:Mem ratios are getting more common amongst P4 DDR. Boards with SiS chipsets tend to have more ratios available...MSI648Max for example:
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