That's an odd looking beast. I've used a Scythe Ninja and an HR01 fanless on a QX9650 so fanless can work fine on a hot chip if the case has decent ventilation, but both those seem to have better airflow through the fins that that Zalman.
Having used (and still use) an HR-01 I'd be more interested in this
FanlessTech: Thermalright HR-22 preview