Confusing speed reports

Question

Hi folks, I'm new here and a noob to OCing.  I'll try to keep it short and to the point.  Please hang with me.  Bottom line is I'm getting different CPU speeds reported by different utilities.
First off:
Mobo - MSI P6N SLI Platinum
BIOS - v1.4
CPU - E6750
MEM - 2 x 1G Kingston Hyper PC2 6400 CL4 240
OS - Win XP home ed
Vid - MSI Nvidia 8800GT 512 OC
Sound - SB Ex-Fi gaming
EIST DISABLED
DOT  DISABLED
I'm trying to raise my FSB and CPU speed.  I've read a lot on this and other forums to try to get educated on the OC process.  But I haven read anything that matches exactly what I'm seeing.  First thing to do is raise the FSB right?  Several utilities show my stock FSB to be 333Mhz but the BIOS shows:
CPU 2667
FSB 1333 - huh?
MEM 800
MULT 8
There's no 333MHz in the BIOS to be tweaked directly.  I deduce there is a 4x multiplier involved and tweak the only "FSB" adjustment available to 1500Mhz to give me a hoped for FSB result of 375MHz and a CPU speed of 3GHZ (8x375).  I'm thinking I got that right and my 3DMark06 score went up proportionaly.  But several utilities are reporting different and confusing speeds.
The BIOS shows   CPU 3GHz  FSB 1500MHz
3Dmark06 detects CPU 3GHz  FSB not shown
others show      CPU 3GHz  FSB 333Mhz (I'm pretty sure I remember seeing that)
Still wanting some confirmation that I really have a 375MHz FSB I decided to pause the info screen that blinks quickly when going into BIOS Setup.  It reports "speed 377MHz x 8 = 3016MHz".  That's good, I got the ~375 FSB I was trying for. But here's the kicker, below that it says:
"A 333MHz system processor is installed.  This processor is not supported on this system board and will run at reduced processor clock speed.  System performance will be impacted."
I decide that can't be right because it reports on the same screen "speed 377MHz x 8 = 3016MHz".  Scratching my head I download and run CPU-Z and PC Wizard 2008. And they both show a CPU speed of 2250MHz!!  The problem seems to be the multiplier.  CPU-Z shows a multiplier of 6.  But every now and then flashes an 8 and show 3000MHz.
What's goin on?

Answer 1

Quote
How do I fix Speedstep and C1E issue?
This is not an issue. Speedstep (EIST) and C1E are power saving features of your processor.  If they are enabled, multiplier and VCore are supposed to be reduced when the system is IDLE.  All values should go back to default as soon as you put some load on your processor (try Prime95).
--> To turn off Speedstep (EIST): Set your Windows Power Profile to "Always On", "Desktop" or "High Performance" and/or disable EIST/Speedstep in BIOS.
--> To turn off C1E Support: the BIOS Option is hidden, go to the BIOS section labeled "CPU Features" and press F4....the Option should be visible after that:
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So with your CPU FSB set at 375MHz the memory is running at 1500MHz
This is not correct.  If system clock mode is set to "Manual" in BIOS, FSB clock speed and memory clock speed are not linked.  Both values can be modified independently. The BIOS shows effective values for both settings.  If memory clock speed is set to 800 MHz it already means DDR2-800 (real clock speed is always 1/2 of the effective settings (so in this case 400 MHz).
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Several utilities show my stock FSB to be 333Mhz but the BIOS shows:
1333 MHz is the effective value.  The true or real value for clock speed is always 1/4 of the effective rating.  CPU clock speed is based on real clock speed (not effective clock speed).