lots of talk, but barely anybody has a 5870 lol...
im really curious about this myself, 5870 SHOULD be much faster than a 4890 considering ati doubled everything except for mem bw, which is still improved notably over a 4890... so its really odd the perf is only 40% higher than a 4890 on average... it could be that the shader cores are less efficient now that dx11 is added?

w1zzard disabled some sps on his 5870 to simulate a 5850, it would be really cool if we could disable half the sps and connected rops and ideally tmus, to basically have a 5870 cut down to the same specs as a 4890 and we can do a clock for clock compare...