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The answer is yes, or no, depending on if you have some knowledge of oc. see link: http://www.hardforum.com/showthread.php?t=903623

After i bumped up fsb to 200, and increase Vcore, my dell booted but failed to load os. i basically did bsel pin mod and VID pin mod. the volage was increase to 1.450. i think the voltage was still too low to load OS and programs. Also, based on current psu, which is only 305 w, even i increased...

why don't you go for the same mobo used by toms, and get one cool fan like zalman. i have dell's mobo and i am trying to figure out if it's worse than yours :D

You are right. Tom got Zalman 9500 to hit 3.9g then went to water cooling. But i knew someone used another kind air cooler (heating pipe kind) to run 4.0g smoothly. That's for retail PD 805

Yes, Tom Did increase the voltage to 1.475?...I will do it too. I will do the pin mod to increase Vcore coz i have dell mobo

I know PD 805 could have run 4.0 ghz as long as heat problem solved. What makes the difference between dell's pd 805 and retail's pd 805? http://www.tomshardware.com/2006/05/10/dual_41_ghz_cores/index.html

Thanks for help, don't you think the memory frequency is the issue? i currently have stock 533MHz DDR2

I totally agree. but, somehow, i feel to overclock prebuilts is more challenging, and thus more exciting. if you just sit there to do bios change, that easy cake has no fun coz any kids can do it

i am overclocking my PD 805 using pin mod. because i have dell dimension which is not allowed to change fsb in bios. It seems only way to overclock for dell is to do pin mod. i did the following way trying raise cpu from 2.66 to 3.33ghz. i covered bsel 1 (pin h30) with tape and made it high...

i am overclocking my PD 805 using pin mod. because i have dell dimension which is not allowed to change fsb in bios. It seems only way to overclock for dell is to do pin mod. i did the following way trying raise cpu from 2.66 to 3.33ghz. i covered bsel 1 (pin h30) using a small piece of tape...

I think FSB 166 should work. if the mobo works with 133MHz, and works with 200Mhz, it should work with 166 too. See the chart below. But why did my try fail? Could it be memory? i have 533MHz DDR2 512Mb right now. It's dell mobo, so it might have fixed fsb:memory divider, but i can't change...

So what method did you use? coz dell wont' give you the chance to do anything in bios

What kinda mobo are you using? did you change fsb in bios or went to do pins mod. let me know, i am overclocking PD 805 too

Oops. It's not working. i took out Pentium D 805 from mobo. I checked and found Bsel 1 was L. Since my first target is to overcloce PD 805 from 2.66 to 3.33, i have to bump up fsb from 133 to 166. i had to make the pin H. I used a small piece of tape to cover the Bsel 1 (H30). When i put the...

Anyone konw how fast we can overclock Athlon fx-55 without water cooling?

For safety reason, i just want to overclock the cpu PD 805 from 2.66 to 3.33 first. It should not need to change dell stock fan. what i just need is to bump the fsb from 133 to 166mhz (166x20=3.33ghz). To do that, i just need to isolate the bsel 1. I don't think i need to increase cpu voltage...

If the heat is the issue, i can put a good heatsink like Zalman 9500. I think Dimension 5150 has enough case room. Dimenison 5150 has Pentium D 805, which is slight cooler than PD 820 (95w vs 130w?). I can't wait...i will do it soon

I just ordered Dimension 5150. It has pentium d 805 with intel 945 mobo. trying to overclock to 4G by mod pins. is it possible that i can still use original heat sink? anyone did this?