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533mhz FSB P4

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October 15, 2003 12:09:51 PM

Quick question, can a Pentium 4 with FSB 533mhz (socket 478) be run in a socket 478 400mhz FSB motherboard?

<P ID="edit"><FONT SIZE=-1><EM>Edited by kingius on 10/15/03 09:55 AM.</EM></FONT></P>

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October 15, 2003 2:37:20 PM

no, it will only be able to run underclocked with 100mhz fsb (400mhz)


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October 15, 2003 3:00:36 PM

It's maybe possible the board will support it, although as an overclocked setting. Specify exactly which mobo and someone might be able to tell you.

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October 15, 2003 3:06:20 PM

The board is an 845GL and Im looking at upgrade options for the processor.

If i were to buy a 533mhz FSB P4 processor and not overclock the board, what speed would it run at? E.g. if the processor was 2.6ghz, for example.

<P ID="edit"><FONT SIZE=-1><EM>Edited by kingius on 10/15/03 11:08 AM.</EM></FONT></P>
October 15, 2003 3:18:51 PM

It would run @ ~2Ghz.

you'd get 75% rated speed.
if you put a 800FSB chip in you'd get 50% rated speed.

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October 15, 2003 3:27:39 PM

what make is the motherboard? if it's actually an Intel mobo then you'll not have much joy with overclocking anyway (Intel build good quality boards, but they won't support people pushing them beyond their own specs happily... They just don't really give OC options even though the components can probably handle it, IIRC)

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October 15, 2003 3:30:12 PM

Thanks for the info guys.

The board is an intel board.

So really, getting a 2.2ghz P4 @ 400FSB is the best option because 75% of anything with a 533FSB is going to be less, I think, and 50% of 800FSB is even worse.
October 15, 2003 3:36:13 PM

well... if you put a 3.06Ghz in there you'd get 2.3Ghz :eek:  ..

there is a 400FSB 2.4Ghz P4 I believe, so you could get that one.

Why do you need to upgrade? It's just buying another 400FSB chip will mean buying yet another new processor if you upgrade again later on, whereas getting a new mobo now means you could get stuff like dual channel RAM & 800FSB, and be able to support the first couple of prescott chips when they arrive.

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October 15, 2003 4:07:43 PM

3.0ghz @ 800mhz / 2 = 1.5ghz, or am I misunderstanding? Is there a 3ghz @ 533 chip?

Im just after a quick performance boost, Im running a 1.7ghz chip at present and jumping to 2.2 / 2.4 is quite a bit (1700 + 500 = 2.2 = 33% faster)
October 15, 2003 4:20:01 PM

Yup, there's a 3.06Ghz, 533FSB P4 chip. its the only non-800 bus P4 with hyperthreading IIRC.

What do you want the extra perf. for? if it's gaming you'd be better off spending the $$$ on a better Gfx card.

Apart from that it'll probably give a reasonable speed boost in quite a few apps. Especially if that 1.7 is a celeron. (can't remember if they made a 1.7 P4? definitely a 1.6 & a 1.8, but don't recall a 1.7)

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October 15, 2003 4:24:05 PM

Yep its a celeron. I dont think I would get hyperthreading support because doesnt the board have to support that too, and I bet mine doesnt.

The machine is used for application and games development, programming and 3d model building, as well as regular tasks like surfing the net
<P ID="edit"><FONT SIZE=-1><EM>Edited by kingius on 10/15/03 12:26 PM.</EM></FONT></P>
October 15, 2003 4:59:59 PM

Over a celeron, you'll get MUCH more raw processing power with the 2.2P4. probably nearer 45% than 33%. the P4 based celerons are not held in very high regard.

Stuff like compiling and 3d rendering will get a good boost from that upgrade. I'd only advise against it if you think you'll upgrade again within 6 months or something, for the reasons I outlined above somewhere. If you've got the cash, you may as well go ahead.

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October 15, 2003 6:43:47 PM

Thanks for your help, its been invaluable! :) 
a b à CPUs
a b V Motherboard
October 16, 2003 2:40:59 AM

There are P4 2.6GHz processors with "400MHz" bus, they are a bit harder to find than the 533 or 800 versions, but they do exist.

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