[Oni]

Power Supply 450 Watt and my current GPU only uses 75Watt. Most of the new GPU's  use 300+ i guess.
Any recommendations? Need one that's better than the 1050TI Gaming 4G and doesn't use to much Power Supply

If you're against upgrading the PSU, you should be able to run a 1070:
https://www.zotac.com/us/product/graphic...070-mini-0

Even then, you may be able to scrape by with a 1080. Would need to know your current power consumption.

Thanks you, are you sure i can only have the 'mini' GPU's for my desktop?

You might be able to use full size ones. The reason I recommended those, is because the case looked smaller than most.