PCI slot and graphics card

Okay so I have been looking around for a while and found 2 graphics cards I like and I was wondering what slot my motherboard has. Here are the CPU-Z details. I really need to know if it is a PCI-E x16
Graphics Cards:
-http://www.nvidia.com/page/geforce_7800.html (NVIDIA GeForce 7800 PCIE x16)
-http://www.nvidia.com/page/geforce_6600.html (NVIDIA GeForce 6600 PCIE x16)
CPU-Z:
-http://valid.canardpc.com/show_oc.php?id=2400457
Thank you so much in advance! If you have any answers, questions, comments, or concerns leave me a comment and I will try to get back to you ASAP.
 
A search indicates that NVIDIA recommends a power supply of at least 350W with 22amps on the 12V rail. I don't know what power supply you currently have but if you open the PC case and find the sticker on the power supply it should tell you this information.
 
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