Help required on 2.0ghz processor upgrade

[Gizmotech]

Firstly I know this is a desktop forum and not a laptop forum but I could do with your expertise. Can someone please tell me if a C1 stepping CPU be replaced with a D1 stepping CPU.

I really wan't to know what is the fastest CPU that will go in my laptop. Another forum mentioned a 2.8GHZ Northwood would be compatible, but according to intels CPU specs, all 2.8GHZ CPU has a D1 Stepping. My CPUID dump is as below. Any help appreciated.

Processors Information
------------------------------------------------------------------------------------

Processor 1 (ID = 0)
Number of cores 1 (max 1)
Number of threads 1 (max 1)
Name Intel Pentium 4
Codename Northwood
Specification Mobile Intel(R) Pentium(R) 4 - M CPU 2.00GHz
Package Socket 478 mPGA (platform ID = 3h)
CPUID F.2.7
Extended CPUID F.2
Brand ID 14
Core Stepping C1
Technology 0.13 um
Core Speed 1196.2 MHz (12.0 x 99.7 MHz)
Rated Bus speed 398.7 MHz
Stock frequency 2000 MHz
Instructions sets MMX, SSE, SSE2
L1 Data cache 8 KBytes, 4-way set associative, 64-byte line size
Trace cache 12 Kuops, 8-way set associative
L2 cache 512 KBytes, 8-way set associative, 64-byte line size
FID/VID Control no
Features

[vicaphit]

Feel free to correct me if I am wrong, but as long as the socket is the same it should work.

[Gizmotech]

Initially, thats what i thought. Only later on for someone to tell me that that's not so. Then even later for another forum telling me the maximum I can go upto is 2.8ghz and so long as it is the northwood processor and not the prescott version.

I am so confused and would like to hear everyones views or even maybe from their own experiences before splashing out for a CPU. I'd be gutted if ot don't work hence I'm doing prior research.

[martini161]

Feel free to correct me if I am wrong, but as long as the socket is the same it should work.

ok, i will. even if it is the same socket, if its the chipset doesnt support it then it wont work

[Gizmotech]

so how will i know which ones compatible with my chipset?? is their a list anywhere?