"As per Sapphire's 512MB TOXIC variant, Sapphire have chosen to up both core and memory clocks to the same degree on the Radeon HD 4870 TOXIC 1GB. The board's RV770 core gets a very modest rise of just 30MHz to leave us with a core clock speed of 780MHz, while the board's GDDR5 memory gets more attention lavished upon it, increasing the clock speed from 900MHz to 1GHz, giving us an effective speed of 4GHz considering the properties of GDDR5 memory.

Once again, this Radeon HD 4870 TOXIC offering rolls out Sapphire's dual-slot, vapour chamber cooling technology, coupled with three heat pipes to handle the heat from the board's RV770 core and memory, while hot air is exhausted from the rear of the card to keep it out of your chassis."