Question regarding front side bus speed

olm

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Nov 15, 2013
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18,510
Hello people,
I have an Asus P5Q that allows different front side bus speeds: 1600 / 1333 / 1066 / 800 MHz.(http://www.asus.com/Motherboards/P5Q/#specifications).
My CPU is an Intel Core 2 Quad Q6600 2.4GHz.
However, I don't understand the following values that CPU-Z displays:

Memory tab:
DRAM Frequency: 334.7 MHz

CPU tab:
Core Speed: 1603.67 MHz
Multiplier: x 6.0 (6-9)
Bus Speed: 267.28 MHz
Rated FSB: 1069.05 MHz

Were do all those values come from and which values depend on which other values?

Thanks in advance to anyone who sheds some light on this :)
 

Supahos

Expert
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your memory is currently running at 670mhz for some reason. The processor is the part that limits how fast you can run the memory. It appears you can run memory up to 1066 mhz, potentially a bit higher if you OC your processor. You would likely feel a difference if you ran memory at 1066 vs 670mhz. What memory do you have right now?
 
Dram 334.7 actual is what CPU-Z reports but is actual 669.4 or DDR 667 advertised.
Core speed means 1603.67 is idle speed with Intel speed Step running and under load it will go up to 2.4Ghz
Multiplier lowered 6 because of speed step full 9
Bus speed slightly overclocked should be 266.67 (raising the other numbers slightly, CPU should be 1600/2400 is 1603/2405, Dram should be 333.5 is 334.7)
FSB 1069.05 (because of above a little higher than 1066)

Basically the bus speed is the number that is multiplied for the others affecting all of them.
 

olm

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Nov 15, 2013
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18,510
Thanks for your answers.

The installed memory is OCZ DDR2 PC2-9200 Reaper HPC Edition 2x1GB, 1150 MHz.

I don't understand why the memory is running too slow at 670 MHz and not at 1066 MHz. How can I fix that?