The description suggests it isn't a monster card. ATI must be
pretty ashamed of it, to give so few details. It's a "secret".
http://www.amd.com/us/products/workstation/graphics/ati-firemv-2d/2260-pci/Pages/2260-pci.aspx
From this, it looks like it is based on an RV610.
http://www.pcidatabase.com/reports.php?type=tab-delimeted
That's the same chip used on an HD 2400. I'm using this web
page, to get some statistics, for comparison to your
integrated graphics.
http://www.gpureview.com/videocards.php
Memory Bandwidth: 6.4 GB/sec
Shader Processors: 40
Pipeline Layout: Super-scalar MADDx5
Texture Units: 4
Raster Operators 4
Maybe you can learn more about the existing integrated graphics
with a copy of GPU-Z.
http://www.techpowerup.com/downloads/SysInfo/GPU-Z/
One benefit of a separate card, is the frame buffer refreshes are
on card, so no bus bandwidth is used when the graphics aren't being
updated. Integrated graphics are UMA (unified memory architecture),
and use system memory for a lot of things (including refreshing the
screen 60 times a second). There are exceptions, such as some ATI
chipsets that had a "sideport" memory chip, but nobody benchmarking
those, could tell the sideport memory chip was present or absent.
Due to its limited bandwidth, that memory chip feature was a waste.
If your integrated graphics chip was really old, it might be
worth upgrading. Or if you need the connector type provided
by the add-in video card, that might be worth something to you.
According to the ATI advertisement, they make cards with either PCI
or PCI Express edge connectors. If the card was PCI, I wouldn't
install it (bus bottleneck). If the card is PCI Express, then,
it's a coin toss (hard to make up your mind what to do).