The Club3D Radeon HD 6870 X2 is clocked at 900MHz on the core and 1050Mhz on the memory by default. Voltage control was also available with MSI Afterburner. Unfortunately much like the behaviour of the original single HD6870, we could barely get a 10MHz increase on the core at stock voltage (1.175v) and temperatures were too hot (>100 degrees) causing thermal throttling when we increased the voltage. We could not get anything tangible out of the memory either.

Test Setup


CPU: Intel Core i7-3960X @ 4679MHz 1.48v
Motherboard: ASUS Rampage IV Extreme (latest 1004 bios with CPU Microcode/PCIe 3.0 fixes)
Memory: G.Skills RipJawsX 2133Mhz DDR3 16GB  Kit
Power Supply: Cooler Master Silent M Pro 1000W
Storage: Intel 520 series 250GB SSD
Graphics Cards / Drivers:

Club3D Radeon HD 6870 X2 (Catalyst 11.12 WHQL)

AMD Reference Radeon HD 7970 3GB (Catalyst 11.12 Dec 20 Build)

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)

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