I'm not familiar with model numbers but I know this: if you have two monitor ports on your graphics card(and it sounds like you have an ADC and DVI-I output) you can run two monitors, either mirrored or extended desktop. I have a g5 at my house and work, which have the ADC and DVI-I outputs from the single card, and these both run with dual monitors. So yes that first item is exactly what you need, and the second one looks like the same thing with a longer wire. I'm pretty sure your computer came with it though...look in all the boxes..ours came with it.