I put a P4-2.4G on Dell Dimension 8200. It shows speed only 1.2G (FSB 100.) I switched to P4-1.6G. Then shows 1.6G (FSB 100.) Is there any way to get speed 2.4G with P-2.4G? Why higher CPU runs lower frequency?

Adnakiron

Apparently your motherboard doesn't support the new CPU. You should always check compatibility before buying any hardware. Your board only supports 400FSB (100MHz) or 533FSB (133MHz) CPUs.

http://supportapj.dell.com/support/...

You may need to educate me little bid.
This P4-2.4G works with Asus P4S800-MX which supports 800FSB. It means that CPUs not only identify by the Manufacture, socket type and clock speed such as the P4, socket 478 & 2.4G, but also the FSB? How can I find the FSB for individual CPUs?

Adnakiron

"It means that CPUs not only identify by the Manufacture, socket type and clock speed such as the P4, socket 478 & 2.4G, but also the FSB?"

Yup. The S478 P4 not only comes in 400MHz FSB (100MHz), 533MHz FSB (133MHz) or 800MHz FSB (200MHz) versions, it was available in several different cores (Willamette, Northwood, Prescott) with different L2 cache sizes.

http://www.intel.com/pressroom/kits...

In the case of your 2.4GHz/800FSB (Prescott) CPU, the default clock settings would be 12 x 200MHz (2.4GHz). You currently have it clocked at 12 x 100MHz (1.2GHz). According to the link in my 1st response, your board supports up to 533FSB, so the best you're gonna do with that board/CPU combo is 12 x 133MHz (1.6GHz).

The best you can do is a 2.8ghz pentuim 4 533FSB Northwood. Newegg still sells them for 65 bucks.

I kind of understand what jam(Resp#3)said.
According his math, 533FSB produces only 1.6GHz max. If I installed 2.8G P-4 544FSB Northwood, the motherboard runs 2.8GHz?

Adnakiron

No the 2.4ghz 800mhz FSB pentium 4 version you bought is the reason why you are getting 1.6ghz instead of 2.4ghz. Your motherboard doesn't support pentuim 4 800mhz FSB versions. it only supports pentuims 4 533mhz and 400mhz fsb version.

i'll make this simple without getting into details that are confusing.

If you throw in a 2.4ghz pentium 4 533mhz FSB version in your pc it will be read at 2.4ghz because your motherboard supports those 533mhz FSB pentuim 4 versions. As long as a pentuim 4 processor is either 533mhz FSB or 400mhz FSB your motherboard will read it correctly.

The best you can do is a pentuim 4 2.8ghz northwood core 533mhz FSB. Thoses were the last 533 mhz FSB pentuim 4's made. and i think the last 400mhz FSB pentuims 4's made was at 2.4ghz.

Cobra,
The last 533MHz FSB P4 was the 3.06 with HT, though the original poster's board may have to run it with HT disabled, unless a BIOS update's available.

Also, the last "official" 400MHz FSB P4s were the 2.6As. However, upgrade vendors such as PowerLeap did (and perhaps still do) carry 2.8GHz and even 3.0GHz 400MHz FSB P4s.

Pentium III--Descendant of Intel Core.
Pentium III-S 1400 @ 1.63GHz, 512K L2
X800XT AIW OC 580/600
2GB of RAM
250GB HD
SB Audigy 2
QDI Advance 12 mobo
Smugly running Vista

I appreciate you guys’ info. The bottom line is that I need to get a supported FSB CPU to bring up the computer speed. I am only getting 1.2GHz with 2.4GHz CPU scott. CMOS shows “CPU speed 120 Mhz, Maltipler x10.” and doesn’t have choice to change the FBS. It means the motherboard Supports only 400Mhz instead of 533Mhz, although I updated it with current BIOS. By the way, if UPU meets motherboards FSB, it always reads it up the frequency?
Cobra,
What "HT" means?

Adnakiron

Thanks for the reminder jackbomb I wasn't sure on when they officially made the last versions of those two models.

H/T on a Pentium 4 means “hyper threading”. The original idea behind it was to take the free space from one core and use that free space as a 2nd virtual core when H/T was enabled, but only programs that supported H/T could take advantage of it and there weren't that many programs that did. Once Dual Cores processors came out H/T died out, because unlike H/T Dual Core processors have 2 real cores instead one core virtually acting like 2 like Pentium 4 processors with H/T.

If the motherboard supports the FSB for that processor then it will read the FSB on that processor.

Hey, so generally a CPU will run at the boards max? I have a AMD 64 4000, board that I can get for free support max AMD 64 3800...plus am2 and stuff... strange? will that setup produce max 3800? I guess no overclocking possible then? right?