|Pentium III Overclocking|
A overclocked PIII450 actually outperforms a stock PIII at same speed by good margin.. Why is that?. One reason is that FSB speed's other than the standard 100MHz and 66MHz raises PCI and AGP clocks to higher speeds than normal - and you actually overclock your peripherals. ( see the example for BH6 pci speeds in the help section). But the main reason is that you also overclock the L2 cache - If you manage to overclock the CPU to 630MHz (140MHzFSB ) the onboard L2 memory (cache) that were supposed to run at 250MHz suddenly runs at 315MHz giving a huge performance boost. Picture Another thing to consider when overclocking : The 100-MHz system bus transfers up to 50% more data per second versus. 66 MHz to the processor - grab the calculator ! On the other hand if you don't manage to keep the CPU temperature at a acceptable level this will slow down the performance again. All temperatures above 35'celsius is as a good rule too high.....Components used by Intel are high quality/solid state - and are stable at much higher temperatures - but lower temperatures gives higher performance. You will experience temperatures well above 35' celsius - even if you don't overclock... This only prove one thing - the way of cooling from the CPU manufacturers is not good enough. And odd enough if you take of the inadequate cooler that came with the CPU and install a decent cooler - you loose your guarantee ! I recommend to keep the supplied cooler - for a couple of weeks. If you dont experience that your CPU suddenly fails during this time the chance it will later is small.
* Difficult to achieve without exotic cooling such as VapoChill, there is more/different frontside bus speed than mentioned above - can be : 66MHz, 75MHz, 79MHz, 83MHz, 100MHz, 103MHz, 110MHz, 112MHz, 115MHz, 117MHz, 120MHz, 124MHz, 129MHz, 133MHz, 138MHz, 143MHz, 148MHz, 150, 153MHz depending upon your motherboard.
Overclocking a Pentum 3 is impossible ; You actually overbuss them to achieve higher cpuspeed.
All PIII's are multiplier locked.
PIII 450MHz is multiplier locked at 4.5
PIII 500MHz is multiplier locked at 5
PIII 550MHz is multiplier locked at 5,5
PIII 600 is multiplier locked at 6.0
PIII's are all intended to run at 100 MHz bus speed !
Q : Can I disable the multiplier lock ? A : No one has been able to do this so far J
CPU's used for these test's:
tips for first time overclocking :
Your bios setting may contain more or less settings than mentioned here - READ the manual...
Disabling L2 Cache :
Not recommended at all - only for testpurposes - here's the proof that shows a performance drop of almost 50% !
Too much too handle ?
If you feel that you still don't understand how to crank up your PIII ,and feel insecure how to do it - just leave it as it is. The PIII (and especially PIII450) is still a excellent performer . And until AMD has sorted out their problems with Athlon it's the best processor you can get - taking in concern price/performance. If you really want to crank it up anyway - get someone to help you with it. In the download section you'll find a utility that let you change the bus speed from your desktop ! It's always a chance that you destroy something when you push your system to the edge ; that's the price of overclocking. And in the feedback section I have answered a lot of questions fro, you readers Visit the windows section too - these tip's and tricks will give you more performance too.
Thermal specifications for S.E.C.C.2 CPU's :
Press the thumbnail too see a bigger picture (will open in new window)
What we achieved with a "supertuned" system using PIII450