Difference between asrock z77 extreme4 and extreme6

The Extreme6 has an extra x16 PCIe 2.0 slot @ x4 and also a Display Port connector and Firewire.

In your opinion, is that worth $50?

Not really.

Then I just need to know if I can throw an i5 ivy bridge and a gtx670 on that board and I'll be all set!

I was originally planning on an ASUS sabertooth z77 for my build, but it seems like it will cost WAY more than what I need.

Oh yeah, you'll be just fine with those.  

Then thanks! You've just saved me some unnecessary spending.

You're welcome.  

Do you ever connect IEEE 1394/Firewire devices to your PC or do you have a need for the PCIe x16 @x4 slot or do you ever plan on using any mini-PCI Express cards?

If the answer is no to all of them then save the $50.

If the answer is yes, to any of them, then ask yourself if it's worth $50 to you.

Can you give an example of some devices that use those input methods? I really don't think I do, but I might in the future.

IEEE1394 devices:
- Some Digital Video Cameras
- Some older Printers
- Some older Scanners
- ad-hoc networking
- video frame grabbers

The IEEE1394 port is common on Apple devices. It was once offered on printers and scanners and digital cameras but has been displaced by the cheaper to implement USB port.

mini-PCI Express cards:
- SATA 6.0Gbps AHCI & RAID Controller Card
- Gigabit LAN Card
- Dual Gigabit LAN Card
- SD/SDHC Card
- wireless LAN Card
- H.264 Software Compression Card
- 4 or 8-Channel Video/Audio Capture Software Compression Module
- and several others

Thanks for the info. I don't use any of those now and doubt I will in the future.

Thanks for the addition! I wish I had this back when I was deciding between motherboards.

But right now I'm a proud owner of a gigabyte ud3h and I love it!