I have northwood motherboard with a 2.80 ghz/512/533 processor i buy a new processor 3.40 ghz/533/800 how i can let it work my new processor 3.40 ghz i have windows 7 on my computer, and it works very good with 2.8ghz. i installed my 3.40 ghz processor, and its says on my desktop 3.40-1.70ghz and it works very slow now, i putt my old processor 2.80 back, and it works very good, can you help me please thank you very match

Here are the CPU specs that will help you find a new CPU for your desktop:

Socket 478 for Intel P4 Williamette and Northwood processors

• Supports Intel Pentium 4 processor up to 2.8 GHz
• Supports Intel Celeron processor up to 3.06 GHz (Prescott based Celeron with 533MHz FSB)

Hi
The specs for this machine state that it is a motherboard with
"Socket 478 for Intel P4 Williamette and Northwood processors
Supports Intel Pentium 4 processor up to 2.8 GHz
Supports Intel Celeron processor up to 3.06 GHz (Prescott based Celeron with 533MHz FSB)"
In other words, any CPU that is not socket 478 ( a fairly old socket now) will not even fit on the board. You do not mention your current CPU so you need to compare it with the spec above to see if you can improve it. It is an old machine/motherboard, so your money might be better going towards a motherboard or system box upgrade.
Cheers

That's because your motherboard only supports Northwood chips that have a L2 cache of 512 K. The chip you are trying to use is a Prescott chip with 1MB of L2 cache.

Your best bet would be to buy an INTEL Pentium 4 3.20GHz/512/800 Processor SL6WG Socket 478. It is a Northwood chip with an 800 fsb and has hyperthreading. There is a 3.40ghz model, but you can get the 3.20ghz chip much cheaper.

Here is your motherboards specs page:

http://support.lenovo.com/en_US/detail.page?LegacyDocID=MIGR-51078

That's because your motherboard only supports Northwood chips that have a L2 cache of 512 K. The chip you are trying to use is a Prescott chip with 1MB of L2 cache.

Your best bet would be to buy an INTEL Pentium 4 3.20GHz/512/800 Processor SL6WG Socket 478. It is a Northwood chip with an 800 fsb and has hyperthreading. There is a 3.40ghz model, but you can get the 3.20ghz chip much cheaper.


Here's your motherboards specs page:

http://support.lenovo.com/en_US/detail.page?LegacyDocID=MIGR-51078

pentium 4 2ghz socket 478, either a northwood or prescott type of processor, visit this link for your reference when buying a processor for your motherboard,

http://www.cpu-world.com/Sockets/Socket%20478%20(mPGA478B).html

Your motherboard supports 2 different fsb's.
look these up @ cpu-world
you can use:
Intel Pentium 4 processor (478-pin)
- 533MHz system data bus - supports up to 2.8 GHz
- 400MHz system data bus - supports up to 2.4 GHz

Intel Celeron processor
- 400MHz system data bus - supports up to 2.0 GHz CPU speed
and here are the suppoted cpus:
Intel Celeron RK80531RC029128 BX80531P170G128 1.7 GHz 17 x 400 MHz, Willamette Any A RK80531RC033128 BX80531P180G128 1.8 GHz 18 x 400 MHz, Willamette Any A RK80531RC037128 BX80531P190G128 1.9 GHz 19 x 400 MHz, Willamette Any A RK80532RC041128 BX80532RC2000B 2.0 GHz 20 x 400 MHz, Northwood A 1.525V not supported RK80532RC045128 BX80532RC2100B 2.1 GHz 21 x 400 MHz, Northwood A 1.525V not supported Intel Pentium 4 RK80532PC021512 1.5 GHz 15 x 400 MHz, Northwood Any A RK80532PC025512 BX80532PC1600D 1.6 GHz 16 x 400 MHz, Northwood Any A RK80532PC029512 1.7 GHz 17 x 400 MHz, Northwood Any A RK80532PC033512 BX80532PC1800D 1.8 GHz 18 x 400 MHz, Northwood Any A RK80532PC037512 1.9 GHz 19 x 400 MHz, Northwood Any A RK80532PC041512 BX80532PC2000D 2.0 GHz 20 x 400 MHz, Northwood A 1.525V not supported 2.1 GHz 21 x 400 MHz, Northwood A 1.525V not supported RK80532PC049512 BX80532PC2200D 2.2 GHz 22 x 400 MHz, Northwood A 1.525V not supported RK80532PE051512 BX80532PE2266D 2.26 GHz 19 x 533 MHz, Northwood A 1.525V not supported RK80532PE056512 BX80532PE2400D 2.4 GHz 18 x 533 MHz, Northwood A 1.525V not supported RK80532PC056512 BX80532PC2400D 2.4 GHz 24 x 400 MHz, Northwood A 1.525V not supported RK80532PC060512 BX80532PC2500D 2.5 GHz 25 x 400 MHz, Northwood A 1.525V not supported RK80532PE061512 BX80532PE2533D 2.53 GHz 19 x 533 MHz, Northwood A 1.525V not supported RK80532PC064512 BX80532PC2600D 2.6 GHz 26 x 400 MHz, Northwood A 1.525V not supported RK80532PE067512 BX80532PE2667D 2.66 GHz 20 x 533 MHz, Northwood A 1.525V not supported RK80532PE072512 BX80532PE2800D 2.8 GHz 21 x 533 MHz, Northwood A 1.525V not supported

where are you getting your CPU from you cant just buy any CPU laptop cpu's are made for laptops only and a desktop CPU wont work in a laptop. also what is the FSB of you original cpu if its 400 or 533 it probably wont take a processor that need 800mhz fsb

what does it have currently? i know that motherboard can handle a 478 pin pentium 4 chips. they can be either willamette or northwood processors. i believe they made those lines up to at least 2.8 ghz. just go to newegg.com and look up pentium 4 and either northwood or willamette and you should find something you like.

if you need help installing, here is a helpful site provided by hp.

http://h10025.www1.hp.com/ewfrf/wc/document?docname=bph07139&lc=en&cc=pe&product=424182&dlc=es

I saw the specifications for the MB in the epox site you should not have problem installing winXP sp2, What errors or problem you get when installing SP2.

Usually you can use Northwood-core CPU-s on mobos with Willamatte-core CPU. But is important (exept core) - FSB support of your new processor. Which model of your CPU? What the mainboard use (model)?