Would it be possible to have Desktop Processor P4 on my A31p

[stingbandel]

I was wondering if I could change the processor to a desktop one.

I am thinking to get the P4 2.6 one.


Is it possible?

I see that it has different core voltage. The mobile one is 1.3 and the desktop one is 1.5.



maybe others have tried it before?

thank you

[wolfman]

There is a Pentium 4-M 2.6 gigahertz part available (rare, expensive) - here is a link to one for sale on ebay now:

http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... eName=WDVW

If you search here you can even find a benchmark posting that shows the difference in performance with PC Wizard 2005 beteen the P4-M 2.4 and the P4-M 2.6 to get an idea of what you feel the difference is worth as the P4-M 2.4 is a good clip cheaper.

There have been a number of posts here from A31 users that have upgraded to the P4-M 2.4/2.6 processor. I can't comment on the use of the P4 but I doubt it based on what I read here (assuming you have the i845MP chipset in your A31):

http://www.intel.com/products/chipsets/845mp/index.htm

It lists the Pentium 4-M as a related product, no mention of Pentium 4 mobile.

[stingbandel]

I am currently using P4 M 2.5. I was just thinking to get 2.8 one. One store near my place has it for sale. However, I can't test on it. Once I buy it then I can't return it.


That's why I ask if I could use the desktop one. It will be faster using 2.8 desktop one...

[daeojkim]

Is the socket for desktop and mobile version of P4 the same?

Even if it fits I would be worried about heat issue. I believe 2.6GHz already having hard time cooling and has to throttle down because cooling system cannot keep up.

[a31pguy]

The answer is no. The most of the models of Pentium 4 2.8 Ghz use a different FSB bus speed at least. 400 mhz vs 533 mhz. I also don't believe that it uses the same form factor. The Pentium 4-m 2.6 ghz is about all the horse power you're going to get on the a31p.

The G series uses a Pentium 4 desktop processor. The a31 is always the Pentium 4-M.

845 MP chipset design guide. Very useful information on the a31p mainboard.

http://www.intel.com/design/pentium4/gu ... 068802.pdf

The a31p uses the Intel i845 MP chipset. From the intel website:

" The Intel® 845MP and Intel® 845MZ chipsets are designed, validated and optimized for the Mobile Intel® Pentium® 4 Processor - M. The Intel® 845MP Chipset supports external graphics and Intel® 845MZ Chipset is optimized for value systems. These platforms deliver the benefits of Intel® quality, reliability and stability that businesses need to deploy mobile computers with maximum ROI and performance headroom for the future.

The ICH3-M (82801 CAM I/O Controller Hub 3) makes a direct connection to 845MP/MZ for smoother and faster access to peripherals, providing more benefit for extended PC usage models. Additionally, the chipset uses Intel's advanced mBGA packaging and supports 6 USB ports."

Intel's site for this chipset is found here:

http://www.intel.com/design/chipsets/mo ... n845mp.htm

[MrBean]

Hello GuysElectrically there are differences between P4M and std desktop P4. They use different pin counts, P4M=479, and P4 478. They are not pin/pin compatible, in other words, pins in the same locations are used for different things between these 2 processors.

Nowadays, us overclockers have found that especially the Dothans are very powerful for SuperPI benchmarking, and the board manufacturers have made a socket to allow plugging this cpu into some Asus desktop mobos.

But, in short, you cannot do what you plan, the only way is if you get a model IBM that was designed specifically for Desktop cpu's.....as mentioned elsewhere in this thread.

Br,
MrBean.

[stingbandel]

The answer is no. The most of the models of Pentium 4 2.8 Ghz use a different FSB bus speed at least. 400 mhz vs 533 mhz. I also don't believe that it uses the same form factor. The Pentium 4-m 2.6 ghz is about all the horse power you're going to get on the a31p.

The G series uses a Pentium 4 desktop processor. The a31 is always the Pentium 4-M.

845 MP chipset design guide. Very useful information on the a31p mainboard.

http://www.intel.com/design/pentium4/gu ... 068802.pdf

The a31p uses the Intel i845 MP chipset. From the intel website:

" The Intel® 845MP and Intel® 845MZ chipsets are designed, validated and optimized for the Mobile Intel® Pentium® 4 Processor - M. The Intel® 845MP Chipset supports external graphics and Intel® 845MZ Chipset is optimized for value systems. These platforms deliver the benefits of Intel® quality, reliability and stability that businesses need to deploy mobile computers with maximum ROI and performance headroom for the future.

The ICH3-M (82801 CAM I/O Controller Hub 3) makes a direct connection to 845MP/MZ for smoother and faster access to peripherals, providing more benefit for extended PC usage models. Additionally, the chipset uses Intel's advanced mBGA packaging and supports 6 USB ports."

Intel's site for this chipset is found here:

http://www.intel.com/design/chipsets/mo ... n845mp.htm

Hi,

what makes me wondering is my compaq presario also has the same type of chipset as my ibm. it has the ich3-m. but it uses desktop processor.

it has exactly everything the same. That's why I was wondering.

it would be faster to have desktop processor rather than the mobile one.


I feel my compaq that has only P4 2.0GB faster than my P4 2.5m.

that's why I was thingking to do it.

anyway, I'm gonna buy one and if it doesn't work then I'm gonna put it on my compaq.


I will post a result later on...

thanks

[a31pguy]

I know what you're thinking - but you'd be overlooking that the i845MP chipset isn't the same as the i845D. The i845MP is a mobile chipset. The i845D is for a desktop. The reason it has the same ICH is because the 845 family's hallmark is the IO Controller Hub and Memory Controller Hub (ICH and MCH) - it's part of what is called the "hub interface". All i845 chipsets have this - but the i845MP is specifically a Mobile Platform designed for the Pentium 4-M. But if you can use it in another computer! Great!

[MrBean]

stingbandel:

Hello GuysElectrically there are differences between P4M and std desktop P4. They use different pin counts, P4M=479, and P4 478. They are not pin/pin compatible, in other words, pins in the same locations are used for different things between these 2 processors.

Please read what I have replied to you. It is impossible to do a direct drop in of the cpu's, because of:
1) a Difference in physical design-most important, together with 2)
2)a Difference in electrical design, eg pin-locations/functions.
3)a Difference in thermal design of your case.

Unless you use a convertor, which in my mind doesn't exsist, you can forget it. There are convertors for 479pin Dothan to 478pin Desktop cpu sockets, but not the other way around.

Another possible problem you might face, is if your onboard vreg will allow adjustment of vcore to cater for the desktop cpu.

Have fun.
MrBean.

[stingbandel]

I know what you're thinking - but you'd be overlooking that the i845MP chipset isn't the same as the i845D. The i845MP is a mobile chipset. The i845D is for a desktop. The reason it has the same ICH is because the 845 family's hallmark is the IO Controller Hub and Memory Controller Hub (ICH and MCH) - it's part of what is called the "hub interface". All i845 chipsets have this - but the i845MP is specifically a Mobile Platform designed for the Pentium 4-M. But if you can use it in another computer! Great!

wow... it's strange... I run CPU ID and it detects my mainboard has i845D instead of the MP one.

Is the cpu-z wrong in detecting the chipset?

that's why I was so sure that it would work...

could someone confirm me please... thanks

[a31pguy]

Yup - CPUID is wrong. Mine comes up as a 845D but PC Wizard 2005 comes back with the right one - i845MP - interesting bug.

Just to confirm here is an article which supports the PC Wizard 2005 results.

http://www6.tomshardware.com/mobile/200 ... 1p-03.html

Other differences can be seen between the 845D and 845MP chipsets. The original 845 chipset was designed around Rambus RDRAM having a higher throughput (3200 MB or 3.2 GB). The 845 chipset has a 3200 MB bandwidth - notice the 845MP uses DDR-SDRAM that has a limit of 2100 MB (2.1 GB).