Who's Stronger?

Hello =)
I recently got my Desktop repaired,it got a new motherboard =)
Now with this new motherboard,there's an intergrated video card(GeForce 7 series),or at least thats what the box says.
I'm having a hard time choosing between which one of my two video cards to use.

My ATI Radeon 1600x Saffire Crossfire or the intergrated GeForce 7150?Is there any ways to know which video card is stronger?
My Motherboard is MSI P6NGM(Nvidia MCP73 Series Chipset Based,if that can help)

NOTE:Apparently because the GeForce 7 is intergrated into the motherboard,it will have to use memory directly from my computer,so that might be a con.

Sorry for bad english,
-Kyosuki

I'd pick your ATI Radeon x1600 over the integrated/onboard videocard as what you have stated yourself it takes a chunk of your memory in order for it to be able to render polygons, videos and stuff. the good thing of having an onboard/integrated vidcard is that you can use it if (god forbid) your videocard suddenly malfunctions or gets "fried"

Except for the fact that the Onboard GeForce use the system memory,which one has a "better picture"?

I can't think of any onboard videocard being better than a loose one of its time; go for the Ati card.

integrated = "next"

The GeForce 7150 is a very basic graphics controller. The x1600 would outperform it.