There's some serious power on tap with the HD 5970 when it comes to overclocking. We just hope that the high clock speeds and the voltage software is obtainable by anyone who's interested in attacking the HD 5970.
Looking at the performance numbers, we're seeing the best gains come at the higher resolution. This isn't really too much of a surprise considering you'll probably be running something like 2560 x 1600 or 1920 x 1200 with some pretty high image detail.
Simply put, there's some massive performance to be had here and if you really want to get the most out of the new model from ATI you're going to want to overclock it. Saying that, it doesn't mean that you have to overclock the card; there's still no denying that out of the box the HD 5970 offers some serious numbers.
Overclocking is pretty easy; the clocks you're able to get are insane and the performance increase that we receive when overclocked is nothing short of fantastic. With a bit of time and patience you're going to get better performance than a HD 5870 CF setup for a cheaper price.
If you're going to purchase a HD 5970, there's no rule that says you have to overclock it. But the simple fact is that if you want to make that grin on your face even bigger, you probably will be firing up Overdrive in no time.