A look at general-purpose performance
Graphics cards are more than mere pushers of pixels. Look back to the first page and you'll note the HD 7730 has a 20 per cent GFLOPS throughput deficit when compared to HD 6670, yet the newer card does enjoy a reasonable memory-bandwidth advantage.
What the two GPGPU graphs are showing you is the relative strength of the GCN architecture vs. AMD's older VLIW4. The HD 7730's performance is substantially better than the card it should find hard to beat. Newer 7-series architecture and continual software improvements help explain why the HD 7730 is very solid here, and is likely to remain good over the next six months to a year, at the very least.
