Overclocking Pentium D 820 Processor

AbhMkh

Ambassador of Buzz
Hey Guys,

I have a 8 yr old Compaq desktop with a Pentium D 820 processor running at 2.8 Ghz with this motherboard

Motherboard Specifications, RC410-M (Asterope2) | HP® Support


Just for fun and some research purposes I want to overclock this CPU to above 3 Ghz. Now it has been a long time since I touched the desktop market(have been using laptops since) and I have a few doubts regarding the OC process.

1. How should I OC it since the Bios does not have any OC options ?

2. When I OC it, will I need any extra cooling apart from what is already there ?

3. Do I need a new PSU in order to match the OC'ed processors power demands.

4. Auxillary Question : Can I install a GPU on this motherboard ? , If yes, which one ?

5. Auxillary question 2 : Can I replace the MOBO altogether and keep the cabinet ?

TIA,
Cheers !
Abhijit
 
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AbhMkh

Ambassador of Buzz
buy a new pc. you will see miles better performance.

I already have a laptop with the latest specs, this is just for some overclocking experiments.

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So nobody ? ...so much for a tech forum !

Anyways, I did some research of my own and despite having a locked BIOS, I overclocked my Pentium D 820 from 2.8 Ghz to 3.3 Ghz thereby achieving a performance boost of 30 % with stock cooling and PSU

Cheers !
Abhijit
 

whitestar_999

Super Moderator
Staff member
overclocking pentium D requires 'old school' fsb tweaking while now-a-days with intel 'k' series & amd cpu multiplier is the way to go hence the lack of replies.it also means that your experience won't help much with current gen overclocking.
 
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AbhMkh

Ambassador of Buzz
overclocking pentium D requires 'old school' fsb tweaking while now-a-days with intel 'k' series & amd cpu multiplier is the way to go hence the lack of replies.it also means that your experience won't help much with current gen overclocking.

And what makes you think I don't have experience in now--days Cpu multiplier overclocking ?, problem is those methods work only if your BIOS is unlocked or your processor is supported by Intel XTU Utility.

If BIOS is locked, old school "FSB Tweaking" is the way to go !
 

kkn13

Cyber Genius FTW
And what makes you think I don't have experience in now--days Cpu multiplier overclocking ?, problem is those methods work only if your BIOS is unlocked or your processor is supported by Intel XTU Utility.

If BIOS is locked, old school "FSB Tweaking" is the way to go !

why overclock such a old cpu anyway? just curious
i overclocked my pentium 4 HT (530) 3ghz to 3.4ghz with stock stuff on an unlocked msi board didnt see much difference so i brought it back to stock (still works fine)
u wont see a difference in performance as such
 
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AbhMkh

Ambassador of Buzz
why overclock such a old cpu anyway? just curious
i overclocked my pentium 4 HT (530) 3ghz to 3.4ghz with stock stuff on an unlocked msi board didnt see much difference so i brought it back to stock (still works fine)
u wont see a difference in performance as such

For fun and research, you see you overclocked on an "Unlocked" motherboard whereas I overclocked on a "Locked" motherboard.So now I know how to overclock on a motherboard with a locked BIOS :) aka RESEARCH
 

whitestar_999

Super Moderator
Staff member
one usually does experiments to gain experience/find something to try later on in different situations so i assumed your purpose was to gain some experience.my earlier post was about lack of replies here regarding 'old school' overclocking.
 

kkn13

Cyber Genius FTW
For fun and research, you see you overclocked on an "Unlocked" motherboard whereas I overclocked on a "Locked" motherboard.So now I know how to overclock on a motherboard with a locked BIOS :) aka RESEARCH

i have overclocked both types :p
i only mentioned the pentium since u are also trying to overclock a pentium
 

topgear

Super Moderator
Staff member
The only way you may OC is using Set FSB software - if it does not support your motherboard / chipset / clock gen. then there's not much you can do unless you get a OC friendly motherboard that supports your cpu.
 
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AbhMkh

Ambassador of Buzz
i have overclocked both types :p
i only mentioned the pentium since u are also trying to overclock a pentium

Then why didn't you reply to the thread earlier when I was asking ?

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The only way you may OC is using Set FSB software - if it does not support your motherboard / chipset / clock gen. then there's not much you can do unless you get a OC friendly motherboard that supports your cpu.

No need to get an OC friendly motherboard, The PLL IC on the present motherboard is unlocked and I using a software called clockgen tweaked the FSB speed thereby overclocking the Pentium D.
 

kkn13

Cyber Genius FTW
I mean If you had experience in OC'ing a Pentium 4 on both locked/unlocked motherboards why didn't you help me out the first time or hadn't you noticed this thread ?

when i noticed this thread i immediately replied if thats what ur asking
 

topgear

Super Moderator
Staff member
Then why didn't you reply to the thread earlier when I was asking ?

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No need to get an OC friendly motherboard, The PLL IC on the present motherboard is unlocked and I using a software called clockgen tweaked the FSB speed thereby overclocking the Pentium D.

so how far you reached .. post a cpu-z pic :D
 
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AbhMkh

Ambassador of Buzz
so how far you reached .. post a cpu-z pic :D

Here you go....

Pentium D at stock clocks

CSPIsTZ.jpg



Overclocked Pentium D


7EbMsbV.jpg



3.3 Ghz is the max I could get out of it, if I increase the FSB speed beyond 240 MHZ the screen goes black and the system crashes.

I found this to be quite strange because AFAIK we can increase the FSB speed upto atleast the memory speed which is 266 Mhz in this case.

Cheers!
Abhijit
 

whitestar_999

Super Moderator
Staff member
that is why old school overclocking was more difficult.now-a-days anyone with an unlocked cpu multiplier(amd),a budget mobo(though not recommended),a decent power supply & cpu cooler can overclock.
 
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