Despite its price and small build, this little sucker packs a mean punch. Just enough room for small 4x GPU. 16x slot also available. It's a tight squeeze but not impossible. I use this thing for emulation. It's attached to a CRT and flawlessly runs nearly all retro titles. I don't even need a GPU. You may also run into trouble with power if too low for GPU. I love this thing. No regrets thus far.