Temperatures

For temperature testing, we set the fans to 100% manual speed and power control to +20% to mitigate the effects of any throttling 

thermalabilities Sapphire Radeon HD 7950 3GB OC Edition Review: GCN For A Better Price

 

Dual Fan cooler result: 59 degrees (which is very good). We must also give praise that even at 100% the fans are still within reasonable noise levels especially if it is installed inside a sealed enclosure.

stock thermals Sapphire Radeon HD 7950 3GB OC Edition Review: GCN For A Better Price

 

Overclocking

 

On stock voltage, we only managed a unimpressive 40MHz raise on the core (4.4%)

ccc pussyoc Sapphire Radeon HD 7950 3GB OC Edition Review: GCN For A Better Price

 

When voltages were raised to 1200mV, we could push the core clocks to a more respectable 1150MHz. Any more on the core voltage results in some kind of OCP/OVP kicking in causing the system to lock up. We left the memory clock at 1575MHz.

oc settings Sapphire Radeon HD 7950 3GB OC Edition Review: GCN For A Better Price

 

Test Setup:

 

CPU: Intel Core i7-3960X @ 4679MHz 1.48v
Motherboard: ASUS Rampage IV Extreme (bios version 1101)
Memory: G.Skills RipJawsZ 2133Mhz DDR3 16GB  Kit
Power Supply: Antec TruePower Quattro Pro 1200W
Storage: Intel 510 series 250GB SSD
Graphics Cards / Drivers:

Sapphire HD 7950 3GB (Catalyst 11.12 RC11 8.921.2)

AMD Reference Radeon HD 7970 3GB (Catalyst 11.12 RC11 8.921.2)

ASUS Radeon HD 6970 DirectCU II 2GB (Catalyst 11.12 WHQL)

AMD Reference Radeon HD 6990 4GB (Catalyst 11.12 WHQL)

MSI N580GTX Lightning Xtreme Edition 3GB (Nvidia 290.36)