What's stops OC?
- Thread starter mkn100
- Start date
I'm no expert, but I think it all depends on the motherboard, CPU, and memory. The thing is, you don't want to push it too far or you run the chance of burning out your processor. Give us some specs and I'm sure someone that knows more than I can help you.
Skip everything between 100 and 133. If you have average/good cooling go straight to 133FSB. That should run easily. Then start up from there.
When everything is set at 133, all components other than the cpu will be running in spec. Since you can get to 875 Mhz, (125 FSB right?) you are doing great. The odds are that your system will run happily at 1G plus.
Set it up to run 133FSB, if it doesn't boot, increase the core voltage a smidge and try again. Final count is unlikely to require more than 1.85V to get over 1G.
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When everything is set at 133, all components other than the cpu will be running in spec. Since you can get to 875 Mhz, (125 FSB right?) you are doing great. The odds are that your system will run happily at 1G plus.
Set it up to run 133FSB, if it doesn't boot, increase the core voltage a smidge and try again. Final count is unlikely to require more than 1.85V to get over 1G.
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peteb is right,
the reason is 100fsb cpu
=> 100 * 1/3 = 33 pci, 100 * 2/3 = 66 agp
when you o/c to 133fsb mobo changes pci and agp to this
=> 133 * 1/4 = 33 & 133 * 1/2 = 66 apg
@ 125fsb mobo still has 1/3pci, 2/3agp
=> 125 * 1/3 = 41 & 125 * 2/3 = 83
this is probably to much for pci and agp slots...
good luck
however, we all start at the end and finish at the begining
the reason is 100fsb cpu
=> 100 * 1/3 = 33 pci, 100 * 2/3 = 66 agp
when you o/c to 133fsb mobo changes pci and agp to this
=> 133 * 1/4 = 33 & 133 * 1/2 = 66 apg
@ 125fsb mobo still has 1/3pci, 2/3agp
=> 125 * 1/3 = 41 & 125 * 2/3 = 83
this is probably to much for pci and agp slots...
good luck
however, we all start at the end and finish at the begining
only correction I can think of is that the Asus boards I have flip to 1/4 divider at 120FSB, so 125FSB is actually underclocked mem/pci/agp, not overclocked. Don't have a cus2 so I cannot confirm this on that particular board, but it holds true for my others.
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very interesting indeed, my ABIT mobos are at 124/41, 127/42, 133/44 (133/33), 136/34, 140/35, and so it continues.
what chipset is on cus2?
is change over set by chipset or manuf.????
however, we all start at the end and finish at the begining
what chipset is on cus2?
is change over set by chipset or manuf.????
however, we all start at the end and finish at the begining
- Dec 31, 2007
- 48,557
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Most likely you are having difficulaties with ALL your cards because you DID NOT GO FAR ENOUGH! AT 875MHz your PCI bus is running at 42MHz and your AGP at 84! Your PCI cards are DEFINATELY getting abused! Their is NO good choice between 100 and 133. You must go to 133! At 133 your memory timing will return to its faster settings, your AGP bus will return from 2x to 4x, your PCI cards will return to 33MHz, and your AGP bus will return to 66MHz. You will see an increadible increase in performance, stablity, and heat reduction.
Go into BIOS. increase your core voltage to 1.75v, increase your bus speed to 133/133 (unless your using PC100), and enjoy.
Cast not thine pearls before the swine
Go into BIOS. increase your core voltage to 1.75v, increase your bus speed to 133/133 (unless your using PC100), and enjoy.
Cast not thine pearls before the swine
AT 875MHz my PCI bus is running at 42MHz and my AGP at 84. Isn't that a good thing since I overclock them as well?
I tried to overlock my CPU to 133 mhz bus @ 1.75V , but it won't POST. What is the recommend max voltage I should apply to the CPU (before it's fried)?
I tried to overlock my CPU to 133 mhz bus @ 1.75V , but it won't POST. What is the recommend max voltage I should apply to the CPU (before it's fried)?
<A HREF="http://forumz.tomshardware.com/hardware/modules.php?name=Forums&file=viewtopic&p=635262#635262" target="_new">http://forumz.tomshardware.com/hardware/modules.php?name=Forums&file=viewtopic&p=635262#635262</A>
<font color=red>Gasoline + Fire</font color=red> Can be a lot of fun
<font color=red>Gasoline + Fire</font color=red> Can be a lot of fun
- Dec 31, 2007
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Your memory is the most important thing and it's still running slower that 133. You do not get a significant performance increase from overclocking the PCI and it can cause instability. For long term use I recommend 1.90v or less for the PIII. There is a phenomena called "electron errosion" which causes all electical components to wear out. Even household wirering has a limmited lifespan, even if that lifespan is measured in 1000's of years. Increased voltage and heat accelerates the process, and the circuites of a procesor are very small and made of a simiconductive material, accelerating it more. So while I have not seen any hard figures on where to stop, I feel that 1.90v leaves plenty of room for error.
Cast not thine pearls before the swine
Cast not thine pearls before the swine
Bad news! I try to run my P700 on 133 mhz bus, and boost the CPU voltage up to 1.95V, it still doesn't POST. Is there anything else I can do? I have a golden orb on my CPU and 2 fans at the back... Should I run my computer on 700 Mhz or should I overclock my bus speed to 125 mhz as I am using right now?
The AGP could take 83MHz....... (depending on card)
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I am, you know I am. I am Canadian.
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I am, you know I am. I am Canadian.
unless we have missed something it seems you may be a very unlucky sole who's 700 will not do it. It seems very infrequent that this would happen - but always possible.
If you increase the voltage to the chip, set it for 133 FSB and everything else is compatible for 133 (is your RAM CL2 or CL3 and what timing setting do you have it at?) there is usually no problem - it seems yours _may_ be a poor chip batch.
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If you increase the voltage to the chip, set it for 133 FSB and everything else is compatible for 133 (is your RAM CL2 or CL3 and what timing setting do you have it at?) there is usually no problem - it seems yours _may_ be a poor chip batch.
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