Tom's Hardware > Forum > Overclocking > General Discussions > Bios and CPUz FSB dont match, Which is correct

Bios and CPUz FSB dont match, Which is correct

Forum Overclocking : General Discussions - Bios and CPUz FSB dont match, Which is correct

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50bmg   08-31-2008 at 02:22:27 AM

CPUz says that my FSB is 266Mhz. The bios says 400Mhz.

So the system only hits 2.5G at 9.5x. It should be 3.8G at 9.5x.

Which is right; cpuz or the bios?


Message edited by 50bmg on 08-31-2008 at 02:23:02 AM
------------------------------ gigabyte GA-EX38-DS4|Intel C2Q Q9550 @ 3.4G | Sapphire Vapor-x 4870 1G CCC 9.6|4G PNY DDR2 800MHz 5-5-5-12|500G Seagate SATA II HD|Sunbeam core contact cooler 120mm|BFG Tech 800w| Win XP sp2| Antec 1200
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dagger   08-31-2008 at 03:08:28 AM
- 0 +

If it returns to normal when the cpu is under load, it's due to speedstep. One type decreases multiplier, the other lowers fsb. You can disable both in bios.

------------------------------ Q6600@3.6ghz, GA-EX38-DS4 motherboard, 8gb 800mhz ddr2 4-3-3-12, 8800GTS(g92)@780mhz, 1TB + 1.5TB hdds, 850watt psu
 Reply to dagger
Anonymous   08-31-2008 at 04:04:14 AM
- 0 +

Forget it, it's all good...
WHen you're at Idle-your system saves energy..and when it's at full load it it meets your desired needs.

 

Try to load it casually with Prime 95 or 2004(beta)
and check for the CPU-Z change, *while test is ran*.


Message edited by Anonymous on 08-31-2008 at 04:04:52 AM
Reply to Anonymous
50bmg   08-31-2008 at 06:09:13 AM
- 0 +

The results i listed above are from prime95. At load cpuz says it is 266mhz fsb x9.5 = 2.5G.

I didnt have speedstep disabled before and cpuz had it at 400mhz fsb x9.5 = 3.8G.

Nothing has changed. I even flashed my bios to the latest version. That didn't even help.

Reply to 50bmg
Mondoman   08-31-2008 at 06:38:39 PM
- 0 +

Please post a screenshot of the main screen of CPU-z; there are many readings there, and sometimes they get misinterpreted.

------------------------------ e2160@3GHz: OCing my way to Ubuntuland!
 Reply to Mondoman
50bmg   09-01-2008 at 05:46:08 AM
- 0 +

The bios is showing 3.8G @ 400Mhz fsb.

As you can see above, cpuz show otherwise.

Reply to 50bmg
dagger   09-01-2008 at 07:44:38 PM
- 0 +

There are two types of speedstep throttling. C1E drops multiplier, EIST drops FSB. Looks like C1E is off, but EIST is on. Go into bios and turn it off.

------------------------------ Q6600@3.6ghz, GA-EX38-DS4 motherboard, 8gb 800mhz ddr2 4-3-3-12, 8800GTS(g92)@780mhz, 1TB + 1.5TB hdds, 850watt psu
 Reply to dagger
50bmg   09-02-2008 at 02:52:05 AM
- -1 +

I turned off, both speed step settings in the bios. cpuz still shows, 266Mhz fsb x9.5 = 2.5.

Reply to 50bmg
50bmg   09-02-2008 at 04:00:21 PM
- -1 +

i need some ideas on the problem.

Reply to 50bmg
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