Im looking for a PCI Express 2.0 or 3.0 x16 to USB converter

[HIT2K]

Is there a PCI Express 2.0 or 3.0 x16 to USB converter that will fit and run a Radeon HD 7870 Graphics card to connect to a Laptop?

 

[ZionZA]

AFAIK a USB port doesn't have the required bandwidth etc to run a card like that.

 

[HIT2K]

How about a something a bit smaller like the Radeon HD 7770 would that work?

 

[ZionZA]

Are you talking about doing something like this?

http://www.techradar.com/news/computing-components/graphics-cards/how-to-make-an-external-laptop-graphics-adaptor-915616

I would not recommend this at all. The amount of money you are going to spend on this might as well be used to buy a better laptop or desktop pc

 

[manofchalk]

Nope.
The 5Gb/s that a USB3 port can handle is nowhere near enough for a graphics card, for a graphics card you want a PCIe Gen2 8x slot which is about 4GB/s of bandwidth (note that 5Gb = 0.625GB).

If you want to run an external graphics card, the only viable solution right now is either a low performance card connected via Mini-PCIe or Thunderbolt-PCIe enclosure.