overclocked P4 @ 1862

[stonerboy]

I overclocked my P4 1.4 last night to 1862 MHz, and it worked just great. I increased the FSB to 133, decreased the RAM to 3x (it is PC-800, so 3 x 133 = 400, times that by 2 and you get 800 so the memory is still in spec), and increased the voltage on the CPU. It works great. My temp. on the core went from 38 C to about 51 C and stayed around 51 C. I can't wait to try the benchmarks now.

 

[Guest]

Can you tell me how you o/c your board. i have a dell p4 1.3ghz and i believe i can get it up to 1.5ghz. thanks for any info

 

[ejsmith2]

You're aircooling, or watercooling? And isn't the max. spec. temp on those around 62C?

I'd like to see what kind of numbers you get on the sandra bench.....

 

[Guest]

Yes, the max temp is about 62C.

 

[peteb]

Is the RDRAM sensitive to run over spec? What does the board hold the PCI bus at with this FSB? Does it step down to 33mhz again?



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[stonerboy]

To overclock it (I am using an Asus P4T), I went into the BIOS and set CPU the manual and then set the FSB to 133. This gives you a CPU speed of 133 X 14 = 1862. The first time I did it, I left the RDRAM at 4x mode, which basically takes your PC-800 to 133 x 4 = 532 and then that is double pumped so it puts it at 1064. But I couldn't even get the thing to POST at this speed, so I decreased the RAM back to 3x mode which puts it at 133 x 3 x 2 = 799. So this keeps your RAM at its default. The highest I could get the RAM to go keeping it at 4x is the FSB at 115. This put the processor at 1610 MHz and the RAM at 920 MHz. It ran stable at this. Keep in mind that the quality of the RAM will highly affect this. I am using Samsung ECC PC-800 memory. As soon as I went about 115 on the FSB and kept the RAM at 4x then it would not post. I also had to increase the voltage to the CPU from 1.70 to 1.775. This accounts for the heat increase. I hope this all makes sense.

 

[stonerboy]

I am just using a HSF. I am using a coolermaster and it seems to work great. I also keep it in a cool room (about 60 f). I will try to post sandra scores this weekend.

 

[stonerboy]

Yes, the RDRAM is sensitive to run over spec. Once I took the FSB above 115 (that would make PC-920) then it would not post (if I kept it in 4x mode). But at 115 it ran fine. And I do believe that once you hit 133, then the PCI does go back to default. Otherwise I don't think I could have loaded windows. But honestly I am not completely sure on that.

 

[peteb]

Presumeably Sisoft Sandra will tell you what your bus speeds are?

Thanks for the info.

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[Hitman]

I ordered my P4 1.4 Asus P4T,with 512 RAM Samsung.
Looks the same as yours. Is it stable at 1862MHz.Do you have any other advises?
Thanks for the info I needed badly!!!

 

[stonerboy]

When I first overclocked it to 1862 it seemed stable. But finally over the weekend I was able to run it for longer amounts of time with full loads on the memory and CPU and come to find out that it isn't too stable. It would crash quite often giving me multiple errors. I scaled it down a little bit to find the most stable place. It seems that the best performance and stability is when the FSB is at 115. This gives you 1610 MHz. I also left my RAM at 4x, in effect giving you PC-920. The voltage I increased to 1.725. After running many different benchmarks it seems at least for my system that this is the best configuration for performance and stability.