Thermo-electric fans are not all created equal. There is a massive variation in power required and thus air moved. Even for fans that look pretty much the same.
They also need to be fully shrouded to suck air through the whole radiator. Unshrouded fans just recirculate hot air.
The one major advantage of electric fans is being able to move maximum air at low engine speeds. Viscous fans of course move most of the air at higher rpm.
Just be careful, many fans from non reputable brands claim fictitious airflow numbers. If anyone is serious then download a SPAL fan catalogue and have a dig through. They list power draw and air flow curves for all their fans. You can at least trust their figures.
You'll find Spal fans on most ferraris. Probably mafia connections.
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