I'm using this mobo

http://www.giga-byte.com/MotherBoard/Products/Products_8S648FXP-RZ.htm#

It currently runs a Pentium 4 3.2Ghtz Prescott socket 478,
and 1 GB (2 X 512) PC 3200 OCZ brand memory.

It originally had a Geforce FX5700LE but I went online and bought a 7800GS AGP to upgrade it.

To my dissapointment, I cannot succesfully install the video card because the close proximity of the memory slots makes it impossible to seat the card in the AGP slot ( as you can see in the picture), and the large size of the 7800GS.

I'm so sad now, I have to get a new mobo

edit: The picture is actually false, the securing clips on my mobo extend to the middle portion of the AGP slot and that's the problem.