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General Forums => Hardware and Software => Topic started by: LLv34_Snefens on January 15, 2001, 09:32:00 AM

Title: Overclocking
Post by: LLv34_Snefens on January 15, 2001, 09:32:00 AM
Specs:
I was looking into overclocking this, not that I really need it right now, but just to be prepared in the future.
In the BIOS-setup I can either choose the internal frequency automatic where it leaps about 6 MHz per step, or I can manually go down and select the FSB:SDRAM:PCI Frequency and ratio.

The following is listed when doing this:
"Recommendation: If trying to overclock FSB frequency up to 145MHZ or above, select [133:100:33] for the FSB:SDRAM:PCI freq. ratio, and choose the appropiate FSB frequency from FSB/SDRAM/PCI Freq. field"

Now what effect will it have to use the the [133:100:33] ratio instead of the [133:133:33] that I am currently using and, if keeping inside their recommendation, only can keep using up to a total of 864 MHZ (x6 CPU freq. multiplier)? (example, what difference between 800MHZ at [133:133:33] and at [133:100:33]

Why is it recommended to change ratio above 145 MHz and what can happen if you don't?

Thanks,
Snefens
Title: Overclocking
Post by: Lephturn on January 15, 2001, 09:47:00 AM
Basically, the PCI clock runs at FSB (Front Side Bus) speed with a devider.  So a machine running 100 Mhz FSB runs the PCI bus at 100 / 3.  If you boost the FSB to 145 and don't change the PCI clock devider, you are running the PCI bus at 48 1/3, way out of the 33 Mhz spec for PCI devices and some of them will likely flip out and not work.

As you increase the FSB speed, if your mainboard allows you can increase the devider the PCI bus uses.  145 / 4 is 36 1/4, a number MUCH closer to design speed for your PCI devices.  Hence, as you push your FSB speed up, you should up the PCI devider to keep your PCI bus as close to spec as possible.   (http://bbs.hitechcreations.com/smf/Smileys/default/smile.gif)

In the case of your board they do the math for you.  You can select a combination of memory speed, FSB speed, and PCI bus speed.  I think they are saying that if you want to run 145 FSB, you need to pick the slower RAM bus timings to get a lower multiplier for your RAM speed so you don't drive it to hard.  It seems to imply that at 133/133/33 if you push the FSB to 145 your RAM speed won't de-couple and you'll drive your RAM too hard.  If you have some really good CAS2 capable Corsair or Mushkin Ram, you might get away with it.

------------------
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"A pig is a jolly companion, Boar, sow, barrow, or gilt --
A pig is a pal, who'll boost your morale, Though mountains may topple and tilt.
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You'll never go wrong with a pig!" -- Thomas Pynchon, "Gravity's Rainbow"

[This message has been edited by Lephturn (edited 01-15-2001).]
Title: Overclocking
Post by: LLv34_Snefens on January 15, 2001, 11:40:00 AM
thx, guess I won't try exceeding the 145Mhz  (http://bbs.hitechcreations.com/smf/Smileys/default/smile.gif)

So what you are saying is that there really isn't any performance differences between the two, just a change of multiplier? (in my case done automatic)
Title: Overclocking
Post by: straffo on January 15, 2001, 02:06:00 PM
I've bad news for you snef  (http://bbs.hitechcreations.com/smf/Smileys/default/frown.gif)

It would be very hard to overclock your PC because the FSB is already high (133mhz) and on the PIII the multiplier is locked so you can just increase the FSB to something like 145mhz (if by chance your memory accept this frequency)
It will give you something like a 870mhz CPU but with the cost of the stability for a marginal increase of performance  (http://bbs.hitechcreations.com/smf/Smileys/default/frown.gif)

but I my be wrong ,try to find a site dedicaced to overclock it will be more helpfull than I am.
Title: Overclocking
Post by: Staga on January 15, 2001, 04:07:00 PM
In your case the answer might be that GeForce.
Get a proggie called NVMax and give that GeForce something to do  (http://bbs.hitechcreations.com/smf/Smileys/default/wink.gif)
Title: Overclocking
Post by: Camel on January 18, 2001, 06:15:00 PM
looks like Leph explained things well.

I have a Celery 733@958 on the same Asus CUSL2(great board) My thoughts behind the Celery was to take advantage of the last of the 66MHz FSB's celerons with the high multiplyer (11) not to mention $120 price tag.

Here is a great link for CUSL2 owners www.cusl2.com (http://www.cusl2.com)

Dont bother with the Asus UBB, its awful.