I cannot find the specifications for an EMachine 1161-05 desktop. Just want to know if the motherboard will take a PCI sound card.

U need a card that will fit either the pci or pci e slots on motherboard.
So a card and corresponding software will do the trick.

Absolutely!

The Ethernet port on your eMachines is part of the motherboard.
It is attached directly to the motherboard.

The eMachines T3626 Desktop PC, is supposed to use an
ECS MCP61-P (AM2) motherboard. (Cannot verify)
(Elitegroup Computer Systems. (AM2) refers to the processor socket )

http://www.ebay.com/itm/MotherBoard-eMachines-T3626-T5062-T5234-W3622-/320528791641

(Also scroll down for a larger photo of the motherboard )

The Ethernet port is in the group signified by the letter A, on the left.
The group signified by the letter A, is in the I/O area.

Input/Output area. This is where Input, and Output devices are attached, TO the motherboard. (Using the motherboard's chipset)

Now look down the motherboard, to the two long white slots.
These are PCI slots. Signified by the letter I ( i )
If one of these slots is not being used, plug in an Ethernet Card, that is PCI.

If both of these PCI slots are being used, use the small white slot above them, signified by the letter H.

This is a PCI-Express x1 slot. If it is available, use it.
Use an Ethernet Card designed to fit, in a PCI-Express x1 slot.

Example;

PCI Ethernet Adapter Card,

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=771339&CatId=1175

PCI-Express x1 Ethernet Adapter Card,

http://www.newegg.com/Product/Product.aspx?Item=N82E16833106033

[ Note*
The PCI-Express x16 slot that you have, (Orange in color, above the white PCI-Express x1 slot), is for a graphics card.

It is ONLY for a graphics card.
The PCI-Express x1 slot is NOT used for a graphics card ]

For additional questions please post in a Comment.
(If you would like the proper procedure for installing a Ethernet Adapter Card, in your eMachines T3626, also state in a Comment)

Regards,
joecoolvette

No, at least I wouldn't recommend it.

Chip and Chipset are slang terms for I.C.
Integrated Circuit.

http://en.wikipedia.org/wiki/Integrated_circuit

The mounting of an audio chip uses a style of surface mount.
BGA.
Ball Grid Array.

http://en.wikipedia.org/wiki/Ball_Grid_Array

Referring back to the older Processor's, they used pins on the bottom.
These pins mated up to socket holes in the processor socket.

With a BGA surface mount there are no pins.
Solder balls take the place of the pins.
The motherboard has matching copper pads for mating the solder balls.

The chip is set correctly in place on top of the copper pads, and the chip is then properly heated until the solder balls melt, and solder the chip to the copper pads.

It would be Much easier to just install a Sound Card.
The Sound Card can be installed in any available PCI or PCI-E x1 slot.

Gateway 506GR motherboard,

http://support.gateway.com/s//PC/R/3724/4367nv.shtml

Click on Components in the list.
On this page scroll down to the Motherboard heading, and click on -
102007 - Intel (Ausberg) No CPU Motherboard R0

Now click on - Specifications

To the right of the Add-n Cards heading we can see,

1) The motherboard has two PCI expansion slots. {Two PCI Conventional bus connectors)
These expansion slots are White in color.

2) One PCI-Express x1 slot.
(One PCI Express x1 bus add-in card connector)

View of Gateway Intel (Ausberg) motherboard used in a Gateway 506GR desktop computer,

http://www.ascendtech.us/itemdesc.asp?ic=mb4gwaugsburg

Scroll down towards the bottom of the page, and view the motherboard photo, and matching chart underneath.

Z1 points to the two long White PCI slots.
Z points to the shorter Black PCI-E x1 slot.

When the Sound Card is installed one of the expansion slot covers will have to be removed.
(Expansion slot area is shown as D in this rear view,

http://support.gateway.com/s/PC/R/3724/3724rv.shtml )

You may want to just use a Sound Card, that has basically the same specifications as the OnBoard audio you had before, (Integrated Audio), or you may wish to upgrade your sound system a bit with a better Sound Card, and be able to use satellite speakers, and a woofer.

To be continued in a Comment.

First, yes, you can upgrade to a dual core pentium 2.93 GHZ..model E6500
as for video, yes, you can use a 2.0 pci-e video card as long as it is a 1x or a 16x standard. Those are the only standards supported by your computer, so if it is a pci-e 4x then it won't work, at least not for long...incompatible bus architecture.
I hope this helps !

The eMachines W3400 desktop computer has an MSI MS-7145 motherboard.
(MSI = Micro Star International, Inc)

This is the MSI MS-7145 motherboard,

http://www.e4allupgraders.info/dir1/motherboards/socket754/msi7145.shtml

The MSI MS-7145 motherboard, has one PCI Express x16 expansion slot, which is used for a graphics card.

Viewing the bottom left of the photo, you will see three white PCI slots.

Right above them is a longer white slot.
This is a PCI Express x16, expansion slot.

Scrolling down to the subheading - Expansion Slots,
You will see - One PCI Express 16x slot, listed.

Should you require information in installing a PCI Express graphics card, or information on which PCI Express graphics card may fit your needs, state so in a Comment.
(Believe upper right of your page)

ya u can check if u have a pci expressed x1 slot it is small slot along the pci slots...

That particular model has PCI-Express slot for optional upgrades. So if you decide to upgrade the graphics look for anything with a PCI-E label or PCI-Ex16. If you do get a new card make sure to disable the onboard graphics in the system BIOS prior to installing new card. Instructions can be found via google search

nope. Doesn't exist. PCI-e also has a different power output than PCI.

Check out this site provided for a program called SIW. Download the free english version and install. It will tell you everything about your computer that you ever needed to know. Check the motherboard section for your specifics, and try the sound card section to see teh specifics on your card. This will help you in your search for the correct drivers.

www.gtopala.com

SAMMY44,I have the same computer,and the same problem...we need to find the right AC-97 codecs for this type of computer...I found this out by typing the motherboard number on google..Its a real pain in the but to find the codecs for the onboard sound card...your best bet is to buy a pci slotted sound card,or other wise,,you can be like me,,and try try to know your computer on the inside.and try to find the codecs yourself that way if you ever run into this problem again,,you'll know what to do!!!