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Changing Clock multiplier vs. FSB
Name: mrplow350 Date: October 27, 2003 at 14:21:49 Pacific OS: Windows Server 2003 enter CPU/Ram: Dual P3 550/ 384 MB
Comment:
To gain performance, do you always have to change the clock multiplier. Right now, mine is set at 5.5 and I increased the FSB to 112mhz. I changed the jumpers on the motherboard to 6 and left the FSB the same. I used my little CPU utility and found that the computer still sees 5.5 as the clock multiplier. How do I change it to 6 insdead of of 5.5 or is it imbedded into the chip?
Name: jam Date: October 27, 2003 at 14:45:27 Pacific
Reply:
The Pentium multiplier is locked, so any change you make will be ignored...there is no way to unlock it. The only way you can overclock is by raising the FSB. When you raise the FSB, you also increase the speed of the memory, the PCI bus, the AGP, the HDD, etc. The normal PCI speed is 33mhz...the safe max PCI speed is considered to be about 37-38mhz. At 112mhz FSB, your PCI is running at 37.33mhz (112/3)...I doubt you'll get much more out of it without the system becoming unstable.
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Response Number 2
Name: Free Weasel Date: October 27, 2003 at 14:49:18 Pacific
Reply:
If you have a board that also supports 133MHz cpus it divides 133MHz FSB with 4 so you're back to 33MHz PCI again. But I doubt the cpu will do it at that speed!
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Response Number 3
Name: mrplow350 Date: October 27, 2003 at 15:56:04 Pacific
Reply:
I know that. I tried to run it at 133 and then it just locked up. That sucks that Intel locks the multiplier. Then why do they have it on the board?
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Response Number 4
Name: doughnut Date: October 28, 2003 at 07:06:31 Pacific
Reply:
i believe that you can get more performance out of keeping a low multiplyer and a high FSB
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