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)
Answers & Comments
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)