Just about everyone knows that Nvidia’s hot new Fermi graphics chip is literally hot. So, when Asus bundled its new ENGTX480 card with a custom voltage tweaker for overclocking, we wondered if it was such a good idea.After all, do you really need the card to run hotter? And with the speed of the ENGTX480, you probably don’t need the higher clocks anyway. The ENGTX480 ships with 32 shader processors (what Nvidia calls “CUDA cores”) disabled, yet the card still manages to be the fastest single-GPU card you can buy today.