Can I fit GTX 970 into my desktop?

Solution
Your desktop doesn't give us any indication of the available interior space. You'll have to open it up and measure from the rear expansion slot to the first obstruction (often the disk drive bay). As long as it's more than 28cm, that graphics card should fit.

That power supply should be sufficient for your system.

-Wolf sends
Your desktop doesn't give us any indication of the available interior space. You'll have to open it up and measure from the rear expansion slot to the first obstruction (often the disk drive bay). As long as it's more than 28cm, that graphics card should fit.

That power supply should be sufficient for your system.

-Wolf sends
 
Solution
Yes, that site does give the dimensions of the exterior of your case. Again, you have to open the case and measure the interior space where the PCI-Ex16 expansion slot is.

-Wolf sends

Measure the red line:

Graphics%20Card%20Measure_zps3ftv4rrg.jpg