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Which to p4 Get ? 2.53b or 2.5/400fsb ?

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i.t

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Jan 16, 2001
I've heard that the 2.5/400FSB is guaranteed to have c1 steeping.. but it only has 400FSB..

The 2.53b has higher FSB.. but not guaranteed C1 stepping..

I'm planning to built a P4 with the asus P4s533 board.. and samsung pc3200 512mb ram

Which one should i get ?
another option is to wait for the 2.66 to drop in price.

Any help will be greatly appreciated.
 
OP
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i.t

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Jan 16, 2001
so the fact that the 2.53 has 533 FSB doesn't really mean much..

and max overclocked 2.5 will perform better than the 2.53 max overclocked?
 

DDR-PIII

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well if you get the FSB on the CPU with C1 stepping higher than the CPU without the C1 stepping yeah it will perfrom better :)
 
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i.t

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Jan 16, 2001
hmm.. what are my chances ?

Can i also go to my local computer shop and ask them to search their stock for the 2.4 with C1 stepping code, or is that too much to ask for a shop to do that ?
 

BaldHeadedDork

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Aug 18, 2002
Okay, there are a couple of things to look at.

A 2.5/400 will be outperformed by a 2.53/533 at the default settings if the board supports the 533 FSB. But if you overclock all of that goes out the window, because you overclock a P4 by increasing the FSB.

For example, say you have that 2.53/533 and a 2.0/400 that you've run up the FSB to 533, which brings the proc speed to 2.53. The processor performance will be close to a dead heat.

This is why the multiplier is so important on a P4. Because its locked the multiplier set by Intel determines the chips potential for overclocking regardless of the default bus speed.

I don't know the multiplier on the 2.5A, but you should before you buy. You want the chip with the lower multiplier. If the chips have the same multiplier, choose the newer stepping. But if the spread between the multipliers is two or more I'd take whichever chip had the lower multiplier.


BHD
 

markodude

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Jul 15, 2002
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Europe
Have the 2.5 C1 at the moment, best Prime95 stable overclock is 2.8ghz at default.
I have reached higher with more vCore but you need a good board to get this baby to 3ghz+ Prime stable.
www.groveindependentschool.co.uk/benchie.htm for benchies of this processor at 3088mhz.
I would suggest going for a 533bus chip as this chip will not allow a high memory fsb unless you find a board with 1:2 or even 4:6 memory divider.
 
OP
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i.t

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Jan 16, 2001
Oh... good idea..
i'll just wait til nov 14.. when prices drop then maybe i'll get the 2.66 :)

thnx

Just to be sure: All 2.66 chips are C1 stepping right??
 

markodude

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Jul 15, 2002
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Yep all of the 2.66's are C1 stepping. I would wait though as the 2.4B SL6EF C1 steppings are showing up and soon the 2.26B's will be - the 2.26B C1 should allow the highest FSB (as it has lowest multi) for major memory bandwidth.
 

Divine-Madcat

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Oct 22, 2002
Assuming you got the good memory to go with it... not to be mean, but remember, not everybody has Corsair XMS 3500, and so lower Mult P4s arent always the best... really..
 

micamica1217

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Jun 1, 2002
I dont mean to argue but.....

the best chips to buy are the 1.8a, 2.26, and the 2.8......

the 1.8a can do up to 2.8-2.9ghz prime95 stable.
the 2.26 can do up to 2.9-3.0ghz prime95 stable.
the 2.8 can do up to 3.0-3.4ghz on air, prime95 stable.

the rest of the P4 line.....pot luck. some do great, some stink.

if you ask me....the 1.8a wins hands down.

at $140 it can OC to 1ghz over its rated speed...more then 60% faster.

how much does that 2.8 cost again???
and it can't do a 33% overclock????

oh by the way, the 1.8a is also the same multiplyer as a 2.4b, and the 2.4b does about 2.7ghz.
I'll pay less, and get more thank you.

mica
 

kamilkluczewski

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Oct 16, 2002
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Canada
2.4A suck anything 100FSB is a waste.

2.4A running at [email protected], 3:4 Mem for 154DDR, dont waste your time with at 100FSB CPU, in all honesty, greater CPU frequency does not equal better performance. Put it this way, my IT7 MOBO, Rad8500, corsair 3200, and that CPU ^ only give me 9984 on 3dmark2001, but with a 2.4b 533 and OC to 150FSB @ 2.706 and 3:4 mem ratio for 200DDR performance i get 11958 on 3dmark2001. So how does that work?

Simple math my friends, you see at the higher FSB you can send almost an extra gig persecond to the memory. So instead of 3.2Gbs @100FSB you get 4.3Gbs @133FSB, and even higher at 150FSB why do you think the P4 has a quad pumped bus? To allow max data rate through its channels. This allows your videocard, cpu, and all subcomponents to work at peak efficency.

As for the 1.8A, well its a nice CPU, dont get me wrong, 1.8 @ 2.4 is a great overclock, but how long will it last, how many 1.8A's do you see in the NSDS?

Bottom line is this, if you could get a 133FSB get it, even with lower OC you still will outperform any 100 and your games and apps will runs smoother.

Now for the holly grail, if anyone on this forum can get their 100 or 133 to the mother of FSBs, the 200 FSB, with maybe a peltier and watercooling not some LN2 or a fridge, let me know this is my next project that im working on.

Bon Chance in OCing.

Kam :cool:
 
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i.t

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Jan 16, 2001
So.. can i say that the 2.26b 553FSB(doesn't matter what prod code) is the best altnerative to the 2.4b (SL6EF) now ?

I don't have to look at the product code to get a good overclocking 2.26b ?
 
OP
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i.t

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Jan 16, 2001
Oh ya.. by the way..
i just got myself a 512MB corsair ram 3200 XMS
and a albatron 4200 turbo.
which CPU to use to maximize these stuff ?
 

kamilkluczewski

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Joined
Oct 16, 2002
Location
Canada
Definately the 533FSB

No ways around it, i can guarantee you wont hit 150FSB with any 2.0A+ core Northwood, they just cant do it, even the optically shrunk ones. Get your self a 533FSB CPU, OC it to 150FSB or 600FSB by intel terms :D , set your memory 3:4 and enjoy the lightning speed of the system:burn: . Paired with at Rad9700 I bet you can score around 16-17K in 3dMark2001.

Anywhoo, good luck and let us know what you ended up with.

Peace,

Kam:cool:
 
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james.miller

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Jun 8, 2002
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Dunstable, uk
so id the 2.26 the way to go?
(im asking because my next system will be a p4 - and i want maximum memory bandwidth out of it on ddr, i can forfeit a few mhz in processor speed - i dont mind)
 

nodsetse

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Oct 22, 2002
Location
San Diego, CA, USA
Re: Definately the 533FSB

kamilkluczewski said:
...i can guarantee you wont hit 150FSB with any 2.0A+ core Northwood, they just cant do it...
Well I know that's been the case with the 2.0a up to this point, but I'm really hoping the C1 stepping (whenever it's available for the 2.0a) changes that, as I intend to take a C1 2.0a up to 150fsb on a GB mobo. I don't know if we should consider it a positive indication or not, but I do have a C1 Celeron 2.0 that does 3GHz easily. :)