How to tell how many PCI-E lanes?

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I had to put my graphics card into the second slot in my Asus P7P55D Deluxe. The fanless cooler conflicts with my CPU cooler when it's in the first slot.

Is there a way to tell how many lanes are actually available to it in that slot? The manual doesn't mention what happens with a single card in any slot other than the first.

The card is a Sapphire Radeon HD 3650 512MB DDR2. Okay, it's not the fastest and it probably can't max out 8 lanes, but it's silent.

 
Solution
You can download free software called GPU-z, it will tell you how many lanes are available at bus interface section.

http://www.techpowerup.com/gpuz/
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