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Is 1:1 the best ratio between FSB and RAM?

Forum CPU & Components : CPUs - Is 1:1 the best ratio between FSB and RAM?

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andy5174   07-01-2009 at 07:44:27 PM

What's the best ratio between FSB and RAM? Thank you!

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andy5174   07-02-2009 at 01:13:45 AM
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Also, which one is better, E8200 or E6850? Thanks.

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Bronze CPUs badge jsc   07-02-2009 at 12:55:34 PM
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I run 1:1 which for DDR2 means a memory clock twice as fast as the FSB.

E8200.

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andy5174   07-02-2009 at 01:32:20 PM
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jsc wrote :

twice as fast as the FSB


1333MHz x2? Can it be done?

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SirCrono   07-02-2009 at 01:46:48 PM
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The FSB is quad pumped, so 1333 MHz is actually 333 MHz, so double that is 666 MHz, it's perfectly possible.

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andy5174   07-02-2009 at 03:10:55 PM
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SirCrono wrote :

The FSB is quad pumped, so 1333 MHz is actually 333 MHz, so double that is 666 MHz, it's perfectly possible.


What about duo core one? 1200MHz? Thanks

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Helloworld_98   07-02-2009 at 06:01:44 PM
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1200mhz base?, yeah, you aren't getting that.


1200mhz FSB then yeah you can do it, just put your FSB up or down to 300Mhz.

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wisecracker   07-02-2009 at 06:46:33 PM
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andy5174 wrote :

Also, which one is better, E8200 or E6850? Thanks.



Whichever is least expensive - they are effectively equal from the benchies I've seen with a slight nod to the e6850.

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meodowla   07-02-2009 at 07:47:12 PM
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In my P.C it is 1:2

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joefriday   07-02-2009 at 08:22:34 PM
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1:1 with a 333fsb (1333MHz quadpumped) CPU is DDR 667 ram running at rated speed, which is close to the slowest ram you can get anymore.

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andy5174   07-03-2009 at 11:26:07 AM
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Helloworld_98 wrote :

1200mhz base?, yeah, you aren't getting that.


1200mhz FSB then yeah you can do it, just put your FSB up or down to 300Mhz.


So all the C2D/C2Q CPUs are quad pumped? I thought C2D is duo pumped and therefore the 666MHz mentioned by me. Thanks for correcting my misunderstanding.

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Bronze CPUs badge jsc   07-03-2009 at 03:48:18 PM
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No. All the Core2's are quad pumped. It's basically a 1:2:4 ratio of FSB: memory clock: bus clock.

Running the memory clock at less than 1:2 forces the CPU to wait for memory, and therefore costs performance. Running the memory clock faster than 1:2 seems to yield little, if any, real world performance.

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