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Dell CPU replacement

post #1 of 15
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My girlfriends Dell was purchased 2 years ago and has a Celeron 1.8Ghz CPU but I can't figure out what socket it is the online documentation shows (socket u16) which made no sense to me I think it might be a socket 478 but can not confirm that. I was thinking to help her out with the speed of this thing I could buy a P4 2.4GhZ with a 533FSB I think that's as high as I can go because the mobo only supports DDR266 PC2100. Is my math right on that? Has anyone ever tried this or know how to figure out what socket the CPU is without taking the PC apart first? And last but not least has anyone had success replacing the CPU on a Dell unit?

Ric
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post #2 of 15
Quote:
Originally Posted by ricbrooks2
My girlfriends Dell was purchased 2 years ago and has a Celeron 1.8Ghz CPU but I can't figure out what socket it is the online documentation shows (socket u16) which made no sense to me I think it might be a socket 478 but can not confirm that. I was thinking to help her out with the speed of this thing I could buy a P4 2.4GhZ with a 533FSB I think that's as high as I can go because the mobo only supports DDR266 PC2100. Is my math right on that? Has anyone ever tried this or know how to figure out what socket the CPU is without taking the PC apart first? And last but not least has anyone had success replacing the CPU on a Dell unit?

Ric
Hi RicBrooks,

I'd loved to help, but need a little more info, as others will too. The real question is who manufactured the motherboard. ASUS, ECS, etc. Therein lays the problem. Most motherboards placed in Dell, Compaq, Gateway, HP type PC's are stripped down versions of the commercailly available ones. This also means that the BIOS'es are cobbled to fit the PC. So with the motherboard make and manufacturer, I or anyone else here will be able to tell you if a P4 will be recognized by the BIOS and which socket it might be - 478 vs 423, etc...
As for the memory, PC2100. The FSB being 133mhz does suggest a Class "B" P4 might work for you. They ranged from 2.4 to 3.06Ghz. Please post back your findings.
I hope this helped, :-)
post #3 of 15
It's socket 478 because i dont belive that Intel made a socket 423 1.8GHz celeron.. Well, the highest you could go is a 3.06GHz northy that has 533FSB, but yes, that 2.4GHz will work just fine. To know for shure, run CPU-Z on her computer, that will give you a 100% shure answer, but im 90% shure that it is s478.
    
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post #4 of 15
Quote:
Originally Posted by ricbrooks2
My girlfriends Dell was purchased 2 years ago and has a Celeron 1.8Ghz CPU but I can't figure out what socket it is the online documentation shows (socket u16) which made no sense to me I think it might be a socket 478 but can not confirm that. I was thinking to help her out with the speed of this thing I could buy a P4 2.4GhZ with a 533FSB I think that's as high as I can go because the mobo only supports DDR266 PC2100. Is my math right on that? Has anyone ever tried this or know how to figure out what socket the CPU is without taking the PC apart first? And last but not least has anyone had success replacing the CPU on a Dell unit?

Ric
Hi RicBrooks,

Just a couple of other things. You don't need to take things apart. Pulling off the side of the case should be enough. You should be able to read some thing from the motherboard. As for replacing Dell cpu's. Yes I have and in one of the two cases, it was difficult because the case, psu, wiring, fan set ups made it difficult, but not impossible. Patience will be a virtue when you get to that point.

I've got to go, but will check back later. People much smarter than me will also be able to help you.

I hope this helped, :-)
post #5 of 15
Thread Starter 
Hey guys thanks. 455Buick I have a 455Pontiac not exactly the same but close in my teens I hade a 63 Riviera and loved it it had the 401 Nailhead. Back to business I will go home and crack open the case to see what I am working with I found a 2.8Ghz on Newegg for $168 socket 478 533FSB. So that might be a good choice once I can confirm socket and mobo manufacturer. I just built the PC in my signature and she got on it the other day and I think she is a little jealous because it is significantly faster than hers. Cool for me I am learning a lot and wouldn't mind playing some more with upgrades. Thanks again I will post back when I get the info.
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post #6 of 15
Hi RicBrooks,

As for the Celeron 1.8Ghz vs the P4 2.4Ghz. No comparison! In fact, after doing some searching I found that the P4 1.8Ghz was significantly faster. Why you ask? The L2 cache is 4 times as much 512Kb vs 128Kb and the P4 runs on a 133FSb if it's the "B" model. The Celeron runs on a 100FSB. For claification the P4 "A" models ran on 100FSB (quad pumped = 400FSB), the "B" models ran on 133FSB (quad pumped = 533FSB) and the "C" models ran on the 200FSB (quad pumped = 800FSB) P4 "E" models are the Prescotts.

BTW - Wowza was absolutely correct! Both the 1.8 Celeron and the P4 you're considering are based on the 478 socket.

Now the real question. Can you get into the BIOS and set the FSB to 133?? (As I stated earlier, some of these BIOS's are crippled. I have an HP here at home and no mods are allowed, unless you flash it.) If you can't get to the BIOS, you'll see a performance boost, but not like a P4 Northwood running at 133. Also a P4 2.4Ghz is configured to run on a 133FSB. Meaning it's mutiplier is set at 18 (18x133=2.394Ghz). So unless you can get the FSB to 133 the P4 will run at 1.8Ghz (18x100=1.8Ghz) You'll also need to look at the voltage to the CPU. The Celeron 1.8's ran 1.75v and the P4's 1.5v. There is so much to consider...

I hope this helped, :-)
post #7 of 15
Instead of opening the case download CPUz and take a screen shot of the first tab. That'll let us know what you are working with and be able to help you a little more accurately.
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post #8 of 15
Thread Starter 
Well I downloaded Sandra and it is a socket 478; so that part looks good. I don't think I can get to the bios to change that. I have never reflashed anything. How hard is that? I like and idiot thought I could just drop in the P4 2.8 and it would run at the stock rate automatically. I thought I only needed to get into the bios if I wanted to up the FSB. Looks like I am way wrong on that. How do I get the screenshot of CPUZ ? I downloaded it but I'm not sure how to get a shot.
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post #9 of 15
Thread Starter 
I think I got it here it is.

Attachment 18001
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post #10 of 15
Quote:
Originally Posted by ricbrooks2
Well I downloaded Sandra and it is a socket 478; so that part looks good. I don't think I can get to the bios to change that. I have never reflashed anything. How hard is that? I like and idiot thought I could just drop in the P4 2.8 and it would run at the stock rate automatically. I thought I only needed to get into the bios if I wanted to up the FSB. Looks like I am way wrong on that. How do I get the screenshot of CPUZ ? I downloaded it but I'm not sure how to get a shot.
Hi RicBrooks,

No idiots here, just people with questions and some with answers and experiences to share. I had a Gigabyte GA-8INXP (still do, it's my daughters now!). It was running a P4 2.53Ghz Northwood. I thought, what to *ell, I'll just buy a P4 2.6C and run the FSB up to 200. Wrong! Two things. One the P4 2.53 has a 19 multipier (19x133=2.53) and two the Gigabyte motherboard would not let me go beyond 180FSB. So it saw the P4 2.6Ghz as a 2.34Ghz (13x180=2.34) The cpu multiplier was locked so I was stuck. The P4 2.6C was designed to run at 200FSB or 13x200=2.6 I had to buy a new mother board that would go up too and beyond the 200FSB. Just a learning experience I had that I wanted to pass along to you and perhaps others, before you spend your hard earned money upgrading. What your trying to do is possible. Your girlfriends PC will see a performance boost, with the right CPU and possibly some tweaks

I hope this helped more than confused, :-)
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