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What does 1:1 4:5 etc mean?
- Thread starter earl grey
- Start date
How can I tell mines setup for 1:1?
Dangman
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It would help if you told us what mobo, CPU and RAM you have.
Easy, run your ram at 667, problem solved. Or if you have a good hsf, you can OC your proc to 400x8 or 400x9, and run your ram at 800.
Ok. So right now since its at 5:6 that means its running at 800? If I put it at 667 that means it wont run as fast as it is right now right? Looking at it x:y wouldnt it be best if y was high as possible?
Dangman
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With C2D systems, there is no benefit in real world usage from running the "y" as high as possible. In fact, they run best when it's 1:1. With older CPUs, running the Y as high as possible was a good idea. But with the C2D CPUs, no benefit whatsoever.
Ok now I think I know how to calculate.
When FSB is at 333 and ram is at 667 its at 1:1 BECAUSE 667 is DDR so its really 1333. The FSB has a multiplier of 4 so it equals 1333 and 1333/1333 is 1/1 or 1:1.
When the ram is at 800 its really at 1600 and the FSB is still at 1333 and 1333/1600=0.83 and 5/6 is equal to that. It all makes sense now.
When FSB is at 333 and ram is at 667 its at 1:1 BECAUSE 667 is DDR so its really 1333. The FSB has a multiplier of 4 so it equals 1333 and 1333/1333 is 1/1 or 1:1.
When the ram is at 800 its really at 1600 and the FSB is still at 1333 and 1333/1600=0.83 and 5/6 is equal to that. It all makes sense now.
Dangman
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Actually your math is bit off. Here's a much longer explanation:
The FSB speed is equal to the DRAM speed. Double the DRAM speed and you get the RAM speed. So if the FSB is at 333, the DRAM speed is 333. Double the DRAM speed and you get 667. So with the FSB at 333, your RAM speed is DDR2 667 for a 1:1 ratio. So to shorten everything, RAM speed is double that of the FSB for a 1:1 ratio
So to get a 5:6 ratio, your FSB is at 333 while your DRAM speed is 400 (Meaning that the RAM speed is set at DDR2 800 since double of 400 is 800). 333/400 is 5:6. Get it?
You were on the right track but the numbers were wrong.
Dangman
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RAM wise, yes all you need is DDR2 1000 RAM. However make sure that your mobo can handle a FSB of 500Mhz. Some mobos can't handle that at all while some can if the Northbridge is excellently cooled, like with a small 40mm fan or a HR-05 NB HS.
Dangman
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You don't need to run your RAM at DDR2 1066 speeds. Refer back colinstu's list in the second post of this thread. All you need is DDR2 533 speed for a 1:1 ratio.
Some math:
Stated FSB/4 = Actual FSB
Multiplier x Actual FSB = CPU Speed
2 x Actual FSB = RAM Speed
So if the stated FSB is 1066, the Actual FSB is 266Mhz. For a 1:1 ratio, double the FSB to get the RAM speed, which is DDR2 533. Thus all you need for a 1066FSB CPU is DDR2 533 RAM.
Some math:
Stated FSB/4 = Actual FSB
Multiplier x Actual FSB = CPU Speed
2 x Actual FSB = RAM Speed
So if the stated FSB is 1066, the Actual FSB is 266Mhz. For a 1:1 ratio, double the FSB to get the RAM speed, which is DDR2 533. Thus all you need for a 1066FSB CPU is DDR2 533 RAM.
I have this same question about DDR3. I'm not understanding the crazy speeds.