CPU Question

Gig-O-Ram · January 16th, 2007

I wasn't sure whether to put this in the Processor section, or the Motherboard section...

I'm most likely going to have to get a new motherboard for my wife's computer so I can make sure that I can get WinXP to work on a more current chipset. But I'm not sure if I'm gonna need to get a new processor or not. I'm pretty sure her P4 2.8ghz chip runs on a 133mhz FSB (I'm gonna have to pry off the HS and double check), but my question is this:

Can this processor run on a board that is rated for a 400/533/800FSB?

I've been told that memory will run on it's default speed even if the board it's installed in is rated higher. I was wondering if a CPU works on the same concept.

Any advice is welcome.

polobunny · January 16th, 2007

Nope. Will not work.
However are you sure it's not a Prescott 2.8ghz? (Which I highly think it is?) which runs at 533mhz bus speed? (133mhz x 4 (quad-pumped))

Panda Man · January 16th, 2007

Quote:

Originally Posted by polobunny

Nope. Will not work.
However are you sure it's not a Prescott 2.8ghz? (Which I highly think it is?) which runs at 533mhz bus speed? (133mhz x 4 (quad-pumped))

Indeed. I'm about 99% sure that he was looking at the real clock and not the effective. I don't remember P4's going below 400MHz (100MHz x4). Given the clock speed, I highly doubt the bus would be 133MHz, or even 400MHz for that matter.

**stinger608** · January 16th, 2007

The 400mhz systems were 423 board, and I am not even sure that they made a 2.8ghz cpu for the 423 board???

I would venture to guess it is a 478 board, with the 533 effective.

Panda Man · January 16th, 2007

Quote:

Originally Posted by stinger608

The 400mhz systems were 423 board, and I am not even sure that they made a 2.8ghz cpu for the 423 board???

I would venture to guess it is a 478 board, with the 533 effective.

Yea, 2.8GHz would be overkill, it would flood that bus if it were only 400MHz.

The thing that I've always wonder about it why they rate some s478 boards to run at 400/533/800MHz bus speeds.

**stinger608** · January 16th, 2007

Quote:

Originally Posted by Panda Man

Yea, 2.8GHz would be overkill, it would flood that bus if it were only 400MHz.

The thing that I've always wonder about it why they rate some s478 boards to run at 400/533/800MHz bus speeds.

If I remember right, when they first made the 478 boards, they were still heavy into the 400mhz chips but were in development of the 533 and the 800 as well. In fact I do believe that you could buy the 533 chip when they first came out with the 478 boards, but they were at a huge price!!!

Panda Man · January 16th, 2007

Quote:

Originally Posted by stinger608

If I remember right, when they first made the 478 boards, they were still heavy into the 400mhz chips but were in development of the 533 and the 800 as well. In fact I do believe that you could buy the 533 chip when they first came out with the 478 boards, but they were at a huge price!!!

You just contradicted your first post :P 400MHz died off quickly though, that's why I'm curious as to why they still rate them at that (Not saying that they all do, but meh). I can't really see anyone using a 400MHz bus speed anymore, I'd just trash the thing if the motherboard died.

polobunny · January 16th, 2007

No idea. But I have a Willamette s478 1.5ghz and it's at 100x15, guys. :P
PC133, too. @_@

Gig-O-Ram · January 16th, 2007

The CPU/Board is a s478, but whether the chip is a Prescott, I'm not sure. Again, I'm going to have to double check the chip itself. The reason I said it was at 133mhz is because that is what's printed on the chip. It might very well be a Prescott, because the chip comes from the same guy who built a rig for me using a P4 3.2ghz that WAS a Prescott.

The CPU in question was set for HT'ing, so the quad-pumped theory may be correct. It was set at 2.8ghz, so the multiplier would have to be pretty intense to get that speed with only a 133 bus. If I recall, the board's BIOS stated that the CPU speed was set at 133mhz, but it didn't elaborate much. So it could've been running on 533 for all I know.

Actually, it wasn't the board that died - it was the hdd, and I got a replacement, but I'm just having a hard time getting XP SP2 to run with the chipset on the board she has, which is why I'm trying to match up a CPU/Board/chipset config that WILL run SP2.

**gvblake22** · January 17th, 2007

Try running CPU-Z or Everest

January 16th, 2007	#1
Gig-O-Ram As stated in the avatar: Join Date: Apr 2006 Location: Out here in the New Mexico desert. Posts: 806	CPU Question I wasn't sure whether to put this in the Processor section, or the Motherboard section... I'm most likely going to have to get a new motherboard for my wife's computer so I can make sure that I can get WinXP to work on a more current chipset. But I'm not sure if I'm gonna need to get a new processor or not. I'm pretty sure her P4 2.8ghz chip runs on a 133mhz FSB (I'm gonna have to pry off the HS and double check), but my question is this: Can this processor run on a board that is rated for a 400/533/800FSB? I've been told that memory will run on it's default speed even if the board it's installed in is rated higher. I was wondering if a CPU works on the same concept. Any advice is welcome. If it's not fixed, then don't broke it!

January 16th, 2007	#2
polobunny T-Rex Join Date: May 2006 Posts: 4,595 Blog Entries: 6	Re: CPU Question Nope. Will not work. However are you sure it's not a Prescott 2.8ghz? (Which I highly think it is?) which runs at 533mhz bus speed? (133mhz x 4 (quad-pumped))

January 16th, 2007	#4
stinger608 The Real Final Word Join Date: Jul 2006 Location: In the Zone! Posts: 2,550 Blog Entries: 1	Re: CPU Question The 400mhz systems were 423 board, and I am not even sure that they made a 2.8ghz cpu for the 423 board??? I would venture to guess it is a 478 board, with the 533 effective.

January 16th, 2007	#8
polobunny T-Rex Join Date: May 2006 Posts: 4,595 Blog Entries: 6	Re: CPU Question No idea. But I have a Willamette s478 1.5ghz and it's at 100x15, guys. :P PC133, too. @_@

January 16th, 2007	#9
Gig-O-Ram As stated in the avatar: Join Date: Apr 2006 Location: Out here in the New Mexico desert. Posts: 806	Re: CPU Question The CPU/Board is a s478, but whether the chip is a Prescott, I'm not sure. Again, I'm going to have to double check the chip itself. The reason I said it was at 133mhz is because that is what's printed on the chip. It might very well be a Prescott, because the chip comes from the same guy who built a rig for me using a P4 3.2ghz that WAS a Prescott. The CPU in question was set for HT'ing, so the quad-pumped theory may be correct. It was set at 2.8ghz, so the multiplier would have to be pretty intense to get that speed with only a 133 bus. If I recall, the board's BIOS stated that the CPU speed was set at 133mhz, but it didn't elaborate much. So it could've been running on 533 for all I know. Actually, it wasn't the board that died - it was the hdd, and I got a replacement, but I'm just having a hard time getting XP SP2 to run with the chipset on the board she has, which is why I'm trying to match up a CPU/Board/chipset config that WILL run SP2. If it's not fixed, then don't broke it! Last edited by Gig-O-Ram; January 16th, 2007 at 22:06.

January 17th, 2007	#10
gvblake22 Modder-ator Join Date: Dec 2005 Location: Tempe Desert Posts: 6,356 Blog Entries: 1	Re: CPU Question Try running CPU-Z or Everest

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