Overclocking the trio
We increased the power limit of each card by 15 per cent and then ramped the core and memory speeds until the cards couldn't complete our regular Far Cry 3 benchmark. Here's how the trio fared:
| GPU | Sapphire Radeon HD 7790 OC |
Gigabyte Radeon HD 7790 OC |
PowerColor Radeon HD 7790 OC |
|---|---|---|---|
| Default speed | 1,075/6,400 | 1,075/6,000 | 1,075/6,000 |
| OC speed | 1,200/6,832 | 1,180/6,700 | 1,190/6,750 |
| Core OC | 11.6 | 9.8 | 10.7 |
| Memory OC | 6.2 | 11.7 | 12.5 |
Sapphire's card is clocked in the highest default speed and manages to hit the highest overclocked speed, too. The memory percentage increase is the lowest because, at 6,400MHz, it starts at the fastest speed.
Looking from best to worst in terms of Radeon HD 7790s, Sapphire's card is around 15 per cent faster than a stock-clocked model. Yet, putting it all into context, a GTX 660 is 30 per cent faster than the Sapphire.
