How wide is the 8800GTS & X1950XTX?

Is the 8800GTS 320MB wider than the X1950XTX 512MB? Are they the same size? I used to perfectly fit easily an X1900XT, but it was almost near to the capacitor on the motherboard. I don't remember though if the capacitor was higher than the PCIe slot, so this may or may not be a worry for me.

Also, which is the better buy and perform the best in most gaming benchmarks? I live in the Toronto area and the 8800GTS ($470) cost relatively the same to the X1950XTX ($500). For some reason, there is no Radeon X1950XTX in stock anymore!?

I had a hard time deciding because the X1950XTX's fast GDDR4 memory is sweet, and the 8800GTS I am buying only has a mere 320MB. I am planning to game at a resolution of 1280x1024 32bit and set all of the texture details, shader settings, and anti-aliasing + anisotropic filtering to the max! So will the 512MB GDDR4 memory on the X1950XTX help out a lot in that case, or will the 8800GTS 320MB still perform better with high-playable framerates?

Now if only someone can tell me if both of these cards have similar lengths, and if they are both wider than the X1900XT...?

The GeForce 8800GTS 320MB got owned by the Radeon X1900XT 256MB in Quake 4, now how's that even possible?

Quake 4 is a strange game on graphics cards IMO.

I'll go with the 8800gts then. So what's the size of it... is it more wider than the X1950XTX/X1900XT?