Sapphire Radeon HD5870 Vapor-X
Temperatures & Noise
To test temperatures, it is a simple matter of firing up FurMark and letting it run for awhile until the temperatures level out. FurMark pushes GPU thermal loads extremely high, and can be considered a worst-case scenario.
As far as temperatures go, with the 40nm chip you expect lower temperatures overall than previous Radeon series cards, and the 5870 does not disappoint in this regard, despite the fact that it is a monster card with some massive horsepower under the hood.
Wow. Clearly, Sapphire’s Vapor-X technology is successfully doing its job, allowing the 5870 to run astoundingly cool for a flagship card of this caliber. Posting temperatures of 36°C idle / 69°C load is outstanding. We’re not used to seeing such low temperatures on high performance ATI cards, but it appears they’ve turned the corner, and Sapphire’s Vapor-X seems to be leading the way.
No less significant is the fact that the fan doesn’t need to ramp up in RPMs since the card is running cooler to begin with. This translates into lower noise levels, and the Sapphire 5870 Vapor-X is barely audible even under full load. Historically when we’ve seen top performance from ATI, it has come at the cost of high noise levels, with ATI coolers known for being almost as loud as hair dryers. That’s no longer the case here with the Vapor-X; it runs very quiet and very cool while maintaining top performance.