Sapphire gives its new flagship graphics card 6 GB of very fast memory, compared to the mere 3 GB on AMD's reference card. Does this give Sapphire's Toxic HD 7970 GHz Edition a real-world speed boost? We connect it to an epic six-screen array to find out.
We're measuring power consumption at three different settings: Sapphire's 1100 MHz factory core clock, the 1200 MHz Lethal Boost mode, and a fixed 1201 MHz frequency that disables PowerTune.
Using Sapphire's factory setting, the Toxic HD 7970 GHz Edition 6 GB quickly drops to 1050 MHz and stays there, affected by the duress of a very demanding workload. Under the effects of Lethal Boost, the GPU clock rate alternates between 1100 and 1200 MHz. At 1201 MHz, it doesn't budge, of course.
Power consumption at Sapphire's factory clock rate is about 296 W, though it spikes up and down as well. Lethal Boost takes the card to about 314 W. The fixed 1201 MHz GPU frequency adds another two watts to the Lethal Boost setting. In other words, the variable clock rate and TDP limits introduced with the Radeon HD 7970 GHz Edition are basically pointless.
- Sapphire Toxic HD 7970 GHz Edition: 6 GB At 1600 MHz
- Board, Cooler, And Power Supply
- Clock Rates And Lethal Boost Mode
- Clock Rates And Power Consumption: Full Load
- Clock Frequencies And Power Consumption: Gaming
- Temperatures And Fan Speed
- Noise Level Comparison Videos
- Building An Eyefinity-Capable System
- Setting Up And Benchmarking Eyefinity 6
- Setting Up And Benchmarking Eyefinity 4
- If You Like Sapphire's Vapor-X, Stick With The 3 GB Card