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RE: super Pi plus hyperthreading on P4

Reditus — Tue, 10 Jun 2008 18:59:28 GMT

[quote][b]chappers (10/06/2008)[/b][hr]how the hell [sorry - but] have you overclocked to 3.92Ghz?

Is it the same chip as mine - Prescott - Family F - Model 4 - Stepping 1 - Revision E0??[/quote]

Basically i upped the core voltage from 1.3375 to 1.4125 and then slowly upped the fsb from 200.00mhz to 261.82mhz but sadly any higher i went i ether got BSOD or instability.:angry:
I had to overclock the RAM as well but i have forgotten what from and too as i have had a couple of changes in the last few days, but if you are overclocking a lot, then the likelihood of having to overclock the ram is very high otherwise you computer may become unstable or crash

Red

RE: super Pi plus hyperthreading on P4

chappers — Tue, 10 Jun 2008 18:32:11 GMT

how the hell [sorry - but] have you overclocked to 3.92Ghz?

Is it the same chip as mine - Prescott - Family F - Model 4 - Stepping 1 - Revision E0??

RE: super Pi plus hyperthreading on P4

Spedley — Thu, 29 May 2008 00:25:24 GMT

Hyperthreading was designed for when there is a "cache miss" and data has to be accessed from slower memory. During the waiting period, the CPU can run another task which [b]is[/b] resident in the cache.

Running Super PI does not require much memory access and so the cache missing won't occur and mutli-threading will be of little use. I believe it is mainly used for small I/O interrupts which can be serviced while the CPU is busy, i.e. whilst encoding a movie your mouse should stay responsive and usable.

RE: super Pi plus hyperthreading on P4

FreakShow! — Wed, 28 May 2008 23:14:53 GMT

That's hyperthreading for you. It's not the same as having two proper cores. With a multithreaded superpi it will be (most likely) slower anyway. As you are only running one thread of superpi the P4 will effectively run as one and all the power will go to superpi. When running two it splits itself up so both things (whatever they are) are running at half the speed of the P4.

RE: super Pi plus hyperthreading on P4

Reditus — Wed, 28 May 2008 23:09:43 GMT

[quote][b]-Wiz!- (28/05/2008)[/b][hr]You could run two instances of super pi if you like. :)[/quote]

If i run two instences of pi, i would still get the same result or worse because they dont work together so they will be just slowing each other down

RE: super Pi plus hyperthreading on P4

-Wiz!- — Wed, 28 May 2008 22:54:00 GMT

You could run two instances of super pi if you like. :)

RE: super Pi plus hyperthreading on P4

Reditus — Wed, 28 May 2008 13:18:44 GMT

[quote][b]FreakShow! (28/05/2008)[/b][hr][url]http://www.xtremesystems.org/forums/showthread.php?t=111462[/url]

Theres a version of SuperPi that can run on more than one core. Hyperthreading is using one core as two, so you may find that it is a little slower.

I'm not sure on max temps, but with your P4 at 3.92GHz, it looks to be pretty on the limit of what it can do.[/quote]
Damn, the link in the thread you sent me is a 404error

it can go higher but it gets too hot as i am only aircooling it.
i have pushed it just short of 5.00Ghz before but not recomended without watercooling

Thanks
Red

RE: super Pi plus hyperthreading on P4

FreakShow! — Wed, 28 May 2008 13:16:05 GMT

[url]http://www.xtremesystems.org/forums/showthread.php?t=111462[/url]

Theres a version of SuperPi that can run on more than one core. Hyperthreading is using one core as two, so you may find that it is a little slower.

I'm not sure on max temps, but with your P4 at 3.92GHz, it looks to be pretty on the limit of what it can do.

super Pi plus hyperthreading on P4

Reditus — Wed, 28 May 2008 11:36:48 GMT

Hi everyone, i have a Intel Pentium 4 cpu which is using hyperthreading technology. when i run super Pi i get a result of 35.989s on 1M but it only uses one thread, so what is the REAL result when using both threads.
Is there a way of getting super Pi working on both threads or is there a way of working out the actual result
Plus also, does anyone know what temp a pentium 4 prescott edition chip can handle

Thanks
Red :hehe::hehe::hehe: