The current motherboard for my desktop compaq presario s4010om can only hold 1 gig. I would like to know if there are other motherboards out there with the same dimensions and upgradeable to at least 2 gigs, that would work in this housing.

The 400W PSU is going to limit your CPU selection to dual-core at best, although you might be able to get away with a higher-end dual-core CPU if your RAM is not ECC and not dual-channel, and you're not running anything serious in terms of a graphics or sound card or a SCSI array.

Given your current setup I'd really look for a 1.6Ghz dual-core Athlon which has a decent amount of KB in its Level 1 and Level 2 cache, but 3MB for its Level 3 cache.

Anything beyond that ballpark of a CPU upgrade is certainly well within the bounds of diminishing returns, and you should look at getting a new PSU, motherboard, and probably RAM (I'm guessing you're using DDR2 RAM currently).

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/andrew_7b5641a71b84cd85

Form factor is your main concern. This dictates screw holes and case alignment. ATX standard is the most common over counter mobo.

there is a compaq part number printed on all HP/compaq components. if you search for that in google. you can find replacement parts

Ram may not be compatible with the motherboard. Best to contact the maker when upgrading components.

Just about any Socket A / 462 Motherboard in the mATX form factor will work. make sure your memory and CPU are compatible with the motherboard before you buy.

I hope you realize the manufacturer recommends a maximum of 1GB of RAM in this system.

Since the system only has PCI slots, any kind of PCI video card should work without a problem.

You'll find the information you seek at both the processor company and the motherboard company. As for remounting it in a Compaq case you may run into some issues of the On/Off Switch, power lead, reset button ect...matching up. You might be suprised at how inexpensive a new computer case is. I've seen some as low as $25. Your power supply can be removed and it will fit in your new case. You may just have a easier go of it. Good luck...please leave a rating, thank you kindly

Find your manuals here

Actual Motherboard specs in that system is an
DF215-69002 Hp Motherboard (system board) - Echo-GL
Hope that helps, if so please rate my answer.

Thank you

If you do not get the right memory for your computer it will not work. the memory you need is listed in the table below. And pay attention to the max amount of ram. Your system can only hold 2 gig and it comes with one gig installed

Component Attributes Memory Installed 1 GB Maximum allowed 2 GB (2 x 1 GB) Speed supported PC2-4200 MB/sec Type 240 pin, DDR2 SDRAM

Question#1 is my current processor duel core or single core , how can I know?

Intel Celerons are Single Core. You can also download and run CPUID (free) from http://www.cpuid.com/ No installation needed either , just run it!

Question#2 What kind of duel core processor in combination with new ram should I install?

I dont think your computer supports dual core. I cannot be sure without you giving me the make and model of the motherboard. Besides , a 3.33ghz Celeron D is a great processor!!!!

Memory - See http://www.crucial.com/store/listparts.aspx?model=Presario%20SR2150NX you can have a max of 2gb. You have 2 slots on the motherboard so its 1 gb per slot and the board takes DDR2 PC2-5300.

Here , you can expand to your max of DDR2 PC2-5300 2gb (2x1gb) for $24 and theres free shipping too!!!

http://www.crucial.com/store/mpartspecs.aspx?mtbpoid=03AC4AE5A5CA7304