Sapphire will soon release its Radeon HD 4890 Atomic graphics card, this card has a better cooling solution and will feature a 1000MHz core and 4200MHz GDDR5 memory. Standard cards have a 850MHz core and 3900MHz memory, and most of them can't be overclocked all the way to 1000MHz.
Hmm. What's this? Sapphire's cajoled the Radeon HD 4890 core to 1GHz but has used extra voltage to do so, it seems. We reckon this is the case because the PCB features both an eight-pin and six-pin PCIe power connector. The reference card uses dual six-pin connectors. Plug two six-pin connectors in and the system fails to POST.