They have different drivers I know... but for the same price, the specs are different. That's sort of what I was wondering. For example
GeForce 480:
$450
CUDA Cores 480
Graphics Clock (MHz) 700 MHz
Processor Clock (MHz) 1401 MHz
Memory Clock (MHz) 1848
Standard Memory Config 1536 MB GDDR5
Memory Interface Width 384-bit
Memory Bandwidth (GB/sec) 177.4

Quadro FX 1800:
$450
CUDA Cores 64
Core Clock (MHz) 550 MHz
Memory Clock (MHz) 800 MHz
Memory Size Total 768 MB GDDR3
Memory Interface 192-bit
Memory Bandwidth (GB/sec) 38.4

So.... yeah.