Question: Just a quick question, I've got a DELL T3400 CN-0TP412 Motherboard, and I was wondering if:

* it is compatible with "PCI-E 3.0" video cards?
* Are there any performance implications (if PCI-E is backwards
compatible)?

Specifically the 'Sapphire Radeon R9 270X Vapor-X 2GB'.

<http://www.pccasegear.com/index.php?main_page=product_info&cPath=193_1560&products_id=25511>

How would I determine this myself by looking at the specs?

* 3 x PCI Connectors
* 1 x PCI-E x1 Connector
* 2 x PCI-E x4/x8 Connector

Thanks!

Answer: 
We’re talking about this thing, right?
![Board](https://i.stack.imgur.com/ifI9i.jpg)

If so, there’s no problem. Performance might be limited somewhat, but considering the CPUs that fit, that won’t matter anyway.
I have this computer and this motherboard and "CharlieRB's" answer (above) is incorrect, with regards to it not having a x16 lane PCi express lot. 

Not only does the 0TP412 motherboard have a x16 lane slot for PCi express, IT HAS TWO - and both are PCi express 2 slots. You can spot them even in the picture above. On the top left quadrant, that long blue slot is called "SLOT2" and the long black slot is called "Slot4" - both are x16 lane slot PCi express 2 slots.

• 2x PCI Express x16

• 1x PCI Express x8

• 3x PCI 

And if you don't have a 500 watt power, then get one. They're easy to install -you'll need it.