LanOC Reviews published a review on the XFX R7 250E Core Edition
A quote from the article:
These days even a lot of the low power cards still require dual PCI slots. So if you have a setup that requires a single slot video card solution it can be a little hard to find something that performs well and will also fit in your case. I don't think people realize it, but XFX does a great job of creating a wide selection of cards to cover special uses like this. In the past we have seen models from them for people who need half height cards and even silent models. So it wasn't a big shock when they sent over their R7 250 Core Edition single slot card. Really, the only question is how does it compare to the dual slot cards. If it's anything like their past cards it should perform well, but the only way to find out for sure it to run it through our benchmark suite and see how it performs.XFX R7 250E Core Edition @ LanOC Reviews