A 270x will not play bf4 on ultra, it will do 60fps on high/med, a 280x is need for 60fps ultra, I look up charts, and don't just guess like the guy above
*edit
Check out this link http://www.bf4blog.com/battlefield-4-beta-gpu-cpu-benchmarks/
A r9 270x (a rebadged 7870) gets 47fps average on ultra no msaa
A r9 280x (a rebadged 7970) gets 60fps average on ultra no msaa
A 270x will not play bf4 on ultra, it will do 60fps on high/med, a 280x is need for 60fps ultra, I look up charts, and don't just guess like the guy above
*edit
Check out this link http://www.bf4blog.com/battlefield-4-beta-gpu-cpu-benchmarks/
A r9 270x (a rebadged 7870) gets 47fps average on ultra no msaa
A r9 280x (a rebadged 7970) gets 60fps average on ultra no msaa
There is a difference between ultra and ultra + msaa, having it on just ultra will get around 60fps, but i should have said ultra and no msaa.
+ depends on the resolution, so your uploaded scores may be incorrect for his current setup.
True, resolution does matter, either he will use 1080p and the scores are relevant, or he will use 900p or lower, and will be getting solid fps.
I do agree that the difference between MSAA and none is about 10 fps.
However the 47fps I pulled from the chart the first time was with no MSAA. I looked back over the chart, and with MSAA on it does 37fps.