is this pci internet card compatible?

[idkeidkk]

hello. i have a compaq presario sr1720nx desktop. would this:
http://www.newegg.com/Product/Product.aspx?Item=N82E16833180052
or
http://www.newegg.com/Product/Product.aspx?Item=N82E16833315082

be compatible??

basically how do i know what pci x.x i have??

the first one is pci 2.3 and the other it doesn't say. how can i figure out what pci slot i have? is it something i have to install or is it the hardware itself??

thanks.

 

[AlexR]

They bolth are