- Sep 5, 2003
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For Cross-fire, the cards can run at different speeds. You can even cross-fire HD7950 with HD7970. You can bump the memory voltage from 5.7ghz to 6.0ghz in CCC (AMD's driver control panel go to Performance ---> AMD Overdrive --> Move the memory to 1500, press Apply). For $360, it's going to be hard to find an HD7970 with 1.05ghz GPU clocks at this time. The GPU clock matters much more than the memory clock. It's a 15 second fix in AMD drivers anyway if you enable AMD Overdrive and move the slider to full 1500mhz.