that website says that amd hd 5970 is super powerful. and when i say powerful i mean that it is almost more powerful than a gtx titan.
heres the link to hd 5970 vs titan : http://www.hwcompare.com/13981/geforce-gtx-titan-vs-radeon-hd-5970/
and here it is vs a gtx 690 : http://www.hwcompare.com/12679/geforce-gtx-690-vs-radeon-hd-5970/
heres the link to hd 5970 vs titan : http://www.hwcompare.com/13981/geforce-gtx-titan-vs-radeon-hd-5970/
and here it is vs a gtx 690 : http://www.hwcompare.com/12679/geforce-gtx-690-vs-radeon-hd-5970/