Slashdot Mirror
Pentium 4 Overclocked to 7.1GHz, Sets World Record
Netmonger writes "This Japanese guy
overclocked a Pentium 4 to 7.132GHz!! The system managed to calculate pi to 1 million decimal places in 18.516 seconds, setting the world's record." The article notes that a Pentium 4 had been overclocked faster earlier this year, but at that speed it was not possible for the machine to function beyond BIOS. Of course, they'd yet to try diverting power from the dilthium crystal reactor to the deflector array.
Link to the actual forum posting, complete with pics.
p ?t=70225&page=5&pp=25
http://www.xtremesystems.org/forums/showthread.ph
Here you go Clicky
There is another kind of evil which we must fear most, and that is the indifference of good men. -- Boondock Saints
That's not exactly true, you can compute the Nth binary digit of PI without the need of the previous one. Here is the guy who discover it : http://fabrice.bellard.free.fr/pi/
Calculating pi is a series of mathematical operations where you can't do the next one without the prior because you need the remainders. Supercomputers are super due to a heck of a lot of CPUs all working on different parts of a problem that can be broken into chunks. How exactly do you break a series of operations that depend on the priors into chunks for a supercomputer to rip through?
Use the BBP Formula. Pifast is just a benchark, like all benchmarks it's rather silly. The record is for PCs, the top 500 supercomputers are benchmarked using another silly benchmark (LINPACK).
SCO employee? Check out the bounty
Someone has already clocked up an extra 150MHz!
p ?p=1001108#post1001108
Calculating 1m decimal places of Pi now down to 18.093s...
http://www.xtremesystems.org/forums/showthread.ph
it's just two paragraphs for $DEITY sake.
Ok, I'll tell you, lazy boy: besides cooling with liquid N2, they tweaked the processor and the memory voltages.
It's better to be the foot on the boot than the face on the pavement. ~~ tkx Kadin2048
Calculating pi is a series of mathematical operations where you can't do the next one without the prior because you need the remainders.
Leaving aside the BBP algorithm which several other people have mentioned, you're mostly correct here.
How exactly do you break a series of operations that depend on the priors into chunks for a supercomputer to rip through?
But you're going a bit astray here. Large classical computations of Pi are exercises in performing big Fast Fourier Transforms; and there are very good algorithms for doing those in parallel. Using the AGM or a Borwein iteration, computing a million digits of Pi requires approximately 200 full-length FFTs plus some additional linear-time trivially parallelizable work.
So anyway, it looks like this calculating pi is a record in general, not for just a PC.
Give me a 4 processor 3.8GHz Pentium 4 system, and I can beat the reported time by a factor of two. If you can do parallel FFTs, you can do a parallel classical computation of Pi.
Tarsnap: Online backups for the truly paranoid
I know you are joking, but try adobe liposuction
It worked for me. I can open a pdf in less than the time it takes a politician to go from idealistic young upstart to corporate whore.
The last set of great overclocked CPU's were the Celeron 300's. Many of those went to 450-500 MHz with no problem. A very few could be made to hit 600 MHz, though it is questionable on how reliable they were at that point. Certainly reliable enough to calculate the value of PI quickly; but you wouldn't want one for reliable web server.
Granted, some of the one's which could do 450-500 MHz were made for that speed, and then sold as 300's. But certainly not all of them.
The bottom line is that cherry-picking your CPU's helps lead to a better chance of success with overclocking.
The best way to predict the future is to create it. - Peter Drucker.