Gateway Support, and the main support page for the Gateway 510x R4 desktop computer. (It's a Legacy computer)
http://support.gateway.com/s/PC/510Series/2900456/2900456nv.shtml Left-click on - Components
Now left-click on -
2521362 - Intel (Midway 2 GV) Motherboard No CPU RO
(Under the Motherboards heading)
Here you will see a photo of the Gateway 510X R4 motherboard.
[You can enlarge this photo for more clarity in viewing.
Right-click on the photo.
Now left-click on - Save Image As
In the File name: box, you will see - 2521362nv
This will be the file name you will look for.
You can add to this file name, so that it is easier to find.
Left-click twice after the v in 2521362nv
Make one space with your space bar.
Type Gateway 510X motherboard.
Now go below to the right, and click on - Save.
This will go to your My Pictures folder. Open My Pictures, (Start>My Pictures), and double-click on the motherboard photo.
Now go below, and left-click on the Zoom In icon.
The Plus ( + ) sign]
In the main menu left-click on Specifications.
Scroll down to the heading - Expansion Capabilities
Here you will see listed -
Three PCI Bus add-in card connectors (SMbus routed to PCI bus connector 2)
This means you have a PCI slot for a graphics card slot.
Looking at the motherboard photo, you will see three white PCI slots.
In the motherboard photo, these are the three white long slots, towards the bottom left.
Use any open, unused PCI slot. Doesn't matter which one you use.
You need a graphics card that fits in a PCI slot.
These are examples of PCI graphics cards,
http://www.tigerdirect.com/applications/Category/guidedSearch.asp?CatId=28&sel=Detail;55_158_2872_2872My suggestion would be for a graphics card like this,
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=5071671&CatId=3670(You have a 250 Watt power supply in your computer. In the Components list, it is listed under Power Supplies. You have one of those 250 Watt power supply's)
I wouldn't suggest spending more, or going for a better graphics card.
The single core Intel Pentium 4 (3.0GHz) processor, won't handle newer games that require a dual core processor.
No reason to waste your money.
Any questions please state in a Comment.
JCV