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socket 478 / P4 compatibility

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July 26, 2006 3:31:15 PM

I was looking to upgrade my computer and was wondering if the new socket 478 P4s were compatible with my older P4 motherboard...

This is my systems: http://h10025.www1.hp.com/ewfrf/wc/document?lc=en&cc=us...

I am running a P4 1.8Ghz with 256kb cache and 400Mhz Bus. I was hopping to upgrade to a P4 prescott with 1mb cache and 800Mhz Bus. Would they be compatible? And if so, does my motherboard restrict the new processor in any major way?

On a side note, I just got a 6800XT in this system. Is spending up to another $200 to upgrade to a 2.8GHz proc and 1GB of ram worth it?
July 26, 2006 4:08:18 PM

Quote:
I was looking to upgrade my computer and was wondering if the new socket 478 P4s were compatible with my older P4 motherboard...


what motherboard??
cant tell u what will work with out the MB type...
July 26, 2006 4:50:19 PM

I don't believe you can put a 800Mhz FSB CPU in a 400Mhz FSB motherboard...

Well, you can, but I think it will underclock. So if you bought a 3.2Ghz 800FSB, it'll run at 1.6Ghz because of the FSB.

FSB x Multi = CPU speed. Your motherboard has a max FSB of 400Mhz and you are running a 1.8Ghz in there. The multi in the 2.6Ghz CPU is then 4.5. (1800/400) Now the multi for the 3.2Ghz CPU is 4. 4x800=3,200=3.2Ghz. But you have a max of 400FSB, so it is 4x400=1,600=1.6Ghz. You could overclock a whole lot because it is stable at 3.2, but Compaq's don't OC functions and then you'd have to get better memory if their wasn't a mem divider, so short answer: Probably not, sorry.

Don't worry, I'm in the same boat as you. There are a few 400Mhz P4's out there, 2.8Ghz is a good one to start off with. Really? I have one and it seems to run fine. Not sure if it is a Prescott, though.

~Ibrahim~
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July 26, 2006 5:03:17 PM

Check your BIOS to see if it will let you change the multiplier.

And don't even go near the Preshott, I have the 2.8 and I don't recommend it. Its hot and slow. Get the Northwood core, clock for clock its faster.
July 26, 2006 5:11:57 PM

Quote:
And don't even go near the Preshott, I have the 2.8 and I don't recommend it. Its hot and slow.


ha. see what you did there.

well done you.
July 26, 2006 5:22:24 PM

ikjadoon, do you know this stuff or is that just some educated guessing?

And 400MHz BUS P4s cost more than anything else according to pricewatch. Forget that. I might as well get a new Mobo/Proc combo at those prices...
July 26, 2006 5:31:05 PM

Hi,

Unfortunately you can not use any processor besides a northwood 400mhz proc. You may even be limited to a 2.4ghz speed rather than the 2.8 top end proc. in the 400mhz line.

I know this after plenty of research when trying to upgrade my 2.0ghz northwood (finally went with a 2.6 on ebay). These processors have been out of production for a long time and command high prices on ebay, and even higher prices at the stores that still have them.

If you can afford it, you ought to just build a new system while scavaging as much as possible from the old, ie., monitor, cd-rom, floppy, etc. You could even use your memory on a cheap socket 939 build.

Good luck.
July 26, 2006 5:32:24 PM

Quote:
ikjadoon, do you know this stuff or is that just some educated guessing?

And 400MHz BUS P4s cost more than anything else according to pricewatch. Forget that. I might as well get a new Mobo/Proc combo at those prices...

Don't use Pricewatch. Use NewEgg.com.
July 26, 2006 5:33:39 PM

no guessing he's right. for the most part ...

Quote:
ikjadoon, do you know this stuff or is that just some educated guessing?

And 400MHz BUS P4s cost more than anything else according to pricewatch. Forget that. I might as well get a new Mobo/Proc combo at those prices...
July 26, 2006 5:35:20 PM

What about a P4 2.8B Northwood with 533MHz bus and 512mb cache? Will that downclock the CPU as well?
July 26, 2006 5:58:22 PM

I know this stuff, but I am on occasion incorrect, but I'm pretty sure I'm right here.

Well, with a 533Mhz you are still not getting what you pay for. It is an interesting FSB speed because you don't get an whole or a half multiplier. In that case, you would get a 2.1Ghz clock over a 2.8Ghz clock. So yes, it will still downclock.

There are few 400Mhz FSB processors left, most have jumped ship either to 533 or 800...Sorry.

~Ibrahim~
July 26, 2006 6:00:21 PM

damnit!

I see 1 2.8Ghz P4 400Mhz bus on newegg for $85... That may be my only option :( 
July 26, 2006 6:04:10 PM

Quote:
And don't even go near the Preshott, I have the 2.8 and I don't recommend it. Its hot and slow.


ha. see what you did there.

well done you.

I can't take credit for it as the originator, but I don't mind propigating it.
July 26, 2006 6:15:12 PM

yeah, the 1.9 isnt much of an option :p 
July 26, 2006 6:15:20 PM

Quote:
damnit!

I see 1 2.8Ghz P4 400Mhz bus on newegg for $85... That may be my only option :( 


Well, thats not that bad is it? Were you hoping for Northwood?
July 26, 2006 7:03:50 PM

lol, no I did notice. It was the only one I could find. I think it is only half a multi up, lol...

Wait, there is a 400Mhz S478 P4 on NewEgg? I searched, couldn't find ANY S478 400MHz CPU's. And NO, I was not looking in the AMD section. :lol: 

~Ibrahim~
July 26, 2006 7:22:42 PM

There are no 400mhz FSB P4's on NewEgg.

If he got the 2.8ghz 533mhz FSB Northwood, would that be compatible?
July 26, 2006 7:25:02 PM

your right, I was mistaken when looking on newegg...

Any idea on how high I can jump in speed with my old 478 socket? I ask because I figure for the same money as a 2.4/2.6GHz w/400MHz I can buy a 3GHz w/533MHz. Does the extra cache from a 533MHz proc (512kb compaired to 256kb) help? Or is that also disabled from downclocking?
July 26, 2006 7:33:09 PM

I doubt the L2 cache would be affected by a slower FSB. I was going to comment that you look for a CPU with a larger cache. However, I don't think buying a CPU with a higher FSB that is supported on your mobo, a smart idea. Are you sure you don't want to just buy a cheapo LGA775 motherboard and then take full advantage of recent/near-future Intel price cuts. Im sure your performance boost would be most satisfying. However, then you have to take into mind your RAM and other components to make sure they can transfer over okay.
July 26, 2006 7:36:33 PM

Well then... Imma need a solid CPU/MOBO/RAM setup for sub-$250 that is AGP ready and will last....
July 26, 2006 7:38:04 PM

Quote:
Well then... Imma need a solid CPU/MOBO/RAM setup for sub-$250 that is AGP ready and will last....

Define "will last".
July 26, 2006 7:39:54 PM

It will get me through maybe 2 years of gaming...

Considering I will spend most of my FPS time with HL2 games and outside of that some RTSs... Probably not so much the latest and greatest in games...
July 26, 2006 7:44:02 PM

@Gary

Well, yes it would work, but his clock speed would be lower than what the processor is rated for. A 3Ghz processor would get you a 2.2Ghz clock. You would have to buy a 3.73Ghz 533FSB model JUST TO GET TO 2.8GHz. And I don't think they even make 533FSB models that high. At least it'll be nice and cool, lol....

@420

AGP is going to be tough. There might be an board that supports PCI-e and AGP, but it will be PCI-e lite or something. On a LGA775 supporting Core 2 Duo will be even tougher.

I say you hold out as long as you can on this CPU and then save up for Core 2 Duo build...

~Ibrahim~
July 26, 2006 7:45:45 PM

For sub-$250? Do some searching. Cheap mobos can run you around $40-$50. A decent upgrade from your current CPU would probably run around $100-$120. Then RAM is left to around $80-$100 which definitely sufficient for 1 gig. Just do some research on newegg. Shouldn't be too difficult. Goodluck!
July 26, 2006 7:48:18 PM

well right now I am on a P4 1.8GHz and 512mb of ram, with a 6800XT AGP. I need some sort of boost in my ram or CPU to be able to play games properly, but apparently I can't make a move because my PC2700 memory wont be cross-compatible with anything I upgrade too in the future (CPU/MOBO). The only option I can think about is a new proc/mobo/ram for under $250, considering I am upgrading to SAVE money by staying at home (so I wont be spending more to get even better)...
July 26, 2006 7:48:35 PM

Quote:
@Gary

Well, yes it would work, but his clock speed would be lower than what the processor is rated for. A 3Ghz processor would get you a 2.2Ghz clock. You would have to buy a 3.73Ghz 533FSB model JUST TO GET TO 2.8GHz. And I don't think they even make 533FSB models that high. At least it'll be nice and cool, lol....

@420

AGP is going to be tough. There might be an board that supports PCI-e and AGP, but it will be PCI-e lite or something. On a LGA775 supporting Core 2 Duo will be even tougher.

I say you hold out as long as you can on this CPU and then save up for Core 2 Duo build...

~Ibrahim~


Yes, he could wait a few months until he has enough money for Core 2 Duo. Thats what I would do because I don't upgrade often. That would be an expectable upgrade. I mean his 1.8ghz P4 is probably four to six years old? Who knows, it is all up to him. Older Intel CPU's will be pretty darn cheap in the next few months though...
July 26, 2006 7:51:39 PM

I am looking to get a fix within the next 2 weeks... I cannot afford to keep going out and spending money, or buying pot, to keep myself occupied. And my PS2 broke :( ... I might be stuck getting a new PS2 if I can't find a good computer resolution, but I wont my HL2 and RTSs, and I am gonna get the PS3 soon after release so a PS2 would be a short-term waste...
July 26, 2006 7:54:16 PM

Ah, all right. Good luck with it!

~Ibrahim~
July 26, 2006 7:55:10 PM

Quote:
I am looking to get a fix within the next 2 weeks... I cannot afford to keep going out and spending money, or buying pot, to keep myself occupied. And my PS2 broke :( ... I might be stuck getting a new PS2 if I can't find a good computer resolution, but I wont my HL2 and RTSs, and I am gonna get the PS3 soon after release so a PS2 would be a short-term waste...


Okay well.. I just did a quick check and I can't find any LGA775 boards on Newegg that support PC2700 RAM. I only did a very quick search. You may have more luck on other sites. But thats the best I could say. Also, I was only looking in the 25-50 dollar range. So do what you think is best. Goodluck.
July 26, 2006 7:56:04 PM

what processor ranges does a 775 support?
July 26, 2006 7:57:10 PM

Sub 250 you can do if you don't mind not playing games on "high" settings. I'm still running my P4 2.8/1 gig DDR400/FX 5900XT, and I can play current games now on medium settings. Its starting to suffer though, which is why I've got a 7900GT sitting in my living room, ready to go in the next machine ;) 

Actually, you could get a pretty decent socket 939 system for that same 250...just a thought. Depends on how you want to upgrade. If you don't mind completely replacing the system when that two years is up, the 939 is going to be the most cost effective performance. If you want some "next gen" capability, a cheap LGA775 setup wouldn't be bad.

EDIT: And you could also get one of those 939 boards that has both AGP and PCI-E, and you'd have a system that's upgradable for the next 2-3 years easy.
July 26, 2006 8:15:14 PM

Here's one suggestion if you wanted to keep using the RAM you have:

Mobo: http://www.newegg.com/Product/Product.asp?Item=N82E1681... - $48.99

CPU: http://www.newegg.com/Product/Product.asp?Item=N82E1681... - $107

CPU Cooler: http://www.newegg.com/Product/Product.asp?Item=N82E1683... - $30

RAM: http://www.newegg.com/Product/Product.asp?Item=N82E1682... - $45

or if you wanted to spend a few extra bucks and get another 1GB instead of a 512mb stick:

http://www.newegg.com/Product/Product.asp?Item=N82E1682... - $84

Total: ~$230 or ~$270

I have a system pretty much just like that and it games pretty good. Again, that's just one suggestion. With only $250 to spend, your options are way limited.
July 26, 2006 8:20:09 PM

If I upgrade I will probably be looking for an AGP/PCI-e hybrid...

Is there anything that supports PC2700 ram AND PC3200?
July 26, 2006 8:23:10 PM

Quote:
If I upgrade I will probably be looking for an AGP/PCI-e hybrid...

Is there anything that supports PC2700 ram AND PC3200?

I don't think so. For what you're wanting, I don't think keeping it under $250 is possible.
July 26, 2006 8:28:28 PM

You also need to figure out what motherboard form factors your case support. My guess is it's MicroATX, and if that's the case, there's only one motherboard on NewEgg that has AGP and PCI-e that's MicroATX, and it's a pretty shitty brand.
July 26, 2006 8:39:42 PM

I actually have 3 cases, and I think they are all different...
July 26, 2006 8:44:57 PM

Find out if any of them are ATX compatible.
July 26, 2006 9:06:28 PM

Quote:
Well then... Imma need a solid CPU/MOBO/RAM setup for sub-$250 that is AGP ready and will last....


http://www.tigerdirect.com/applications/SearchTools/ite...
AMD 3500+ 939
and a Machspeed Mobo that has AGP and PCI-Express
$120
Tiger direct is bad but I think it's the best choice for your "will last" wish since it even has Pci-express

My friend has this mobo and he's fine w/ it no real probs.
and then just get a 1-2gbs of 3200 ram for rest of $1XX dollars
July 26, 2006 9:08:11 PM

sweet!

Now, does this MB support PC2700?
July 26, 2006 9:10:23 PM

yeh, try not to use ur old ram if its a 2700 since if you buy a new 3200 and use it with the 2700, its going to work as 2700 as well.

*btw, 6800xt is pretty bad :p 
July 26, 2006 9:12:50 PM

I just need a temporary solution untill I can buy some PC3200 ram... This seems PERFECT!

Now let me find out if it fits any of my cases...

Anything I am missing here? I have a SoundBlaster 5.1, a CD-r and DVD-r, an ethernet card, 512mb of PC2700 ram, GF 6800XT, 60GB HD, and a case/power supply. Anything else I would need with his Mobo/CPU?
July 26, 2006 9:16:03 PM

Quote:
I just need a temporary solution untill I can buy some PC3200 ram... This seems PERFECT!

Now let me find out if it fits any of my cases...

Anything I am missing here? I have a SoundBlaster 5.1, a CD-r and DVD-r, an ethernet card, 512mb of PC2700 ram, GF 6800XT, 60GB HD, and a case/power supply. Anything else I would need with his Mobo/CPU?


thts all! but does ur case support ATX mobos? cuz compaq/hp usually comes with mATX cases
July 26, 2006 9:18:06 PM

I gotta couple different cases... If it doesnt work, I wont mind spending $20 on a used case...

So how will this run?

AMD 3500+ 939
1GB PC3200
GF 6800XT
SB Live 5.1

Will it keep me gaming for the next year to two? Considering I aint all into the best of the best games...
July 26, 2006 9:18:37 PM

btw everyone... thanks for all the help! You guys rock!
July 26, 2006 9:19:53 PM

Quote:
I gotta couple different cases... If it doesnt work, I wont mind spending $20 on a used case...

So how will this run?

AMD 3500+ 939
1GB PC3200
GF 6800XT
SB Live 5.1

Will it keep me gaming for the next year to two? Considering I aint all into the best of the best games...


That would be pretty good for cs:s, not too good and not too bad.
and like nearly perfect for counterstrike 1.6.

It's not the worst system.
Good Luck
July 26, 2006 11:43:15 PM

Quote:
Well then... Imma need a solid CPU/MOBO/RAM setup for sub-$250 that is AGP ready and will last....


I hate to say it, but the 6800XT sucks. If I were you, I'd return that sh!t and get a 7600GT so that you're not limited to mobos with AGP. However, if returning your card isn't an option, ASRock sells a socket 939 AMD motherboard with AGP and PCIe. Best of all, it's only $67 at newegg. Pair it with an Athlon 64 3000+ Venice ($77 plus free shipping from newegg!). That brings you to $144, leaving $104 for the RAM. Which means that you can get 1GB Corsair XMS DDR400 and still have $22 left in your pocket (before $6.67 for shipping).
July 27, 2006 2:15:02 PM

The 6800XT is an inbetween card of yestergeneration.... The 7600GT will keep you gaming for a year or so...

~Ibrahim~
July 27, 2006 2:16:02 PM

I was on a $80 budget when I bought it :p  I thought it was the same as the GT because the clock speeds were the same. I didnt notice the pipelines :( 

Does ewize allow open-box returns/exchanges?
!