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FSB to RAM ratio question

post #1 of 6
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Right now my Q6600 is OC'd to a mere 3ghz (Haven't had the time to fiddle past that since I didn't even have to up the vcore).

My fsb to ram ratio is 2:3...ram is running at 500mhz.

Is there a major issue in not running at a 1:1 ratio? Should I down clock my ram to make it a 1:1?? What are the positives of running in a 1:1 ratio? What are the downsides of NOT running in a 1:1 ratio?

Thanks
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post #2 of 6
Keeping your RAM above your FSB is always a positive, keeping it at the same is better than having your RAM lower than the FSB. I can't EXACTLY recall why, I'm fairly sure it;s because instructions sent to the OS pass through the RAM after the FSB, so having the RAM higher eliminates that bottleneck. I'm most likely mixing something up, considering it's 5:17 AM, but hopefully this points you in the direction of understanding the concept
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post #3 of 6
Hi there. Of course a 1:1 ratio means higher bandwidth between your CPU and RAM but Its not always ideal to run It due to stability issues and frequency overheads. The Higher the speed your CPU is clocked at the less It matters to run a 1:1 ratio anyway because your ram and cpu speed is increasing respectively. What you should be aiming for is what ever ratio get you to your maximum stable over clock on both your RAM and CPU. Be patient and experiment, It takes time and lots of benching to achieve this. I reccomend using 3dmark 06 cpu test, super pi and sisoft sandra to test your memory performance.

Goodluck.
    
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post #4 of 6
A 1:1 ratio means nothing of the sort.

Quote:
Originally Posted by R2D2 View Post
Right now my Q6600 is OC'd to a mere 3ghz (Haven't had the time to fiddle past that since I didn't even have to up the vcore).

My fsb to ram ratio is 2:3...ram is running at 500mhz.

Is there a major issue in not running at a 1:1 ratio? Should I down clock my ram to make it a 1:1?? What are the positives of running in a 1:1 ratio? What are the downsides of NOT running in a 1:1 ratio?
If all of your components can handle higher ratios with stability:

There is NO benefit to using a 1:1 ratio with an Intel chipset.

There is NO downside to using a higher ratio, with an Intel chipset.

I've explained why numerous times, and I did a test here:

http://www.overclock.net/intel-mothe...ml#post3567345
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post #5 of 6
Quote:
Originally Posted by Blameless View Post
A 1:1 ratio means nothing of the sort.



If all of your components can handle higher ratios with stability:

There is NO benefit to using a 1:1 ratio with an Intel chipset.

There is NO downside to using a higher ratio, with an Intel chipset.

I've explained why numerous times, and I did a test here:

http://www.overclock.net/intel-mothe...ml#post3567345
(No benefit to using 1:1 versus having RAM go faster than the FSB.)
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post #6 of 6
Yes. Thank you for the clarification.

I should also point out that NVIDIA chipsets work differently, and there is a strong argument for a 1:1 ratio on the 6xxi and 7xxi boards.
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