733MHz shows up as 550Mhz

[dallasr]

I have a HP Pavilion XE734. The motherboard according to HP's website is an ASUS CUW-AM

http://h10025.www1.hp.com/ewfrf/wc/...7170&lc=en&cc=us&dlc=en&product=60947&lang=en

The problem I'm having is that I'm trying to upgrade the CPU to a 733MHz/256/133/1.65v, but the bios only recognizes it as 550MHz. Then I tried installing a 667MHz/256/133/1.65v, but the bios only recognizes it as 500MHz

I've flashed the bios but that didn't help. Right now, I have a 700MHz/128/66/1.7v installed and the bios picks it up correctly. The original CPU was a 600MHz/128/66/1.5v

Any ideas what could be causing this problem and how to fix it?

 

[martyjs]

Not sure you can, I think (maybe wrong) that this Motherboard won't support 133Mhz FSB.
If that's the case then it will never recognize it.

 

[dallasr]

Thanks for the reply! That was my guess too, but I thought it would just go at the lowest FSB speed the motherboard would allow, which is probably either 100MHz or 66MHz. The funny thing is that the motherboard recognizes that it's 256KB cache and 133MHz FSB but it limits the chip to either 550 or 500MHz depending on which chip I put in.

 

[martyjs]

That's how a lot of CPU's get there full speed with the correct FSB M/B. You can see the result if you go into the BIOS and turn down the FSB to maybe 33Mhz. (If the bios will let you). Or turning down the multiplier
Then restart the PC and your clock speed will drop.

 

[dallasr]

There's an option to change frequency ratio in the bios, but the clock speed isn't affected regardless if it's set on the default of 2x or if I change it to a lower 1.5x

 

[nukemaster]

since its old are there any jumpers on the board that do it? anyone remember those things? They used to set the FSB

Being an HP my bet is that its an Asus with the jumper pins missing... so you may be out of luck...but it never hurts to look....

 

[DrMaV]

Hey dallasr,

Your mobo has the i810 chipset, which only supports 66 and 100 fsb.

thus, your 733 (133x5.5) with 5.5 mulitplier will be, 5.5x100=550.
and, your 667 (133x5.0) with 5.0 multiplier will be, 5x100=500.

The GMCH built-in 64-bit memory controller supports only 100MHz PC100 SDRAM memory ... DO NOT use PC133 SDRAM memory.

Mobo only supports max 700 cpu (100x7).

Stay with your 700 (66x10.5), and be happy.

Summary, you're mobo does not support the 133fsb processors.

 

[martyjs]

Hey dallasr,

Your mobo has the i810 chipset, which only supports 66 and 100 fsb.

thus, your 733 (133x5.5) with 5.5 mulitplier will be, 5.5x100=550.
and, your 667 (133x5.0) with 5.0 multiplier will be, 5x100=500.

The GMCH built-in 64-bit memory controller supports only 100MHz PC100 SDRAM memory ... DO NOT use PC133 SDRAM memory.

Mobo only supports max 700 cpu (100x7).

Stay with your 700 (66x10.5), and be happy.

Summary, you're mobo does not support the 133fsb processors.

Spot on, just what I was trying to say but better.