Overclocking
Here's the predicament facing partners building AMD-based cards. The stock frequencies are quite close to the maximum, so Sapphire has to judge just how high it can go without compromising yields. 1,050MHz core, as specified on this model, is sensible given that we topped out at 1,135MHz when the card was set to the performance BIOS mode. The memory overclocks, too, and another 10 per cent on the HBM front can't do any harm.
You're seeing a six per cent rise. Doesn't sound like a great deal, but the close proximity of results means it jumps up a few notches. Of course, other cards can also be overclocked.
Is it worth overclocking? Yes, if every last morsel matters. Can you tell the difference when playing games? No.
This is where newer architectures will prove much more worthwhile than overclocking present ones.