On the reverse side of the PCB we can see an aluminum cover and a steel back-plate of the GPU heatsink.
The graphics cards and their coolers following the reference design, we can’t add anything new to our earlier reviews.
The Cayman GPUs of our cards were manufactured on the 43rd and 44th weeks of 2010.
We can remind you that the Radeon HD 6950 has 1408 unified shader processors and 88 texture-mapping units whereas the Radeon HD 6970 has 1536 unified shader processors and 96 texture-mapping units. The number of raster operators is the same at 32. The GPU frequency of the HD 6950 and HD 6970 is 800 and 880 MHz, respectively, in 3D mode. In 2D mode each GPU is clocked at 250 MHz.
Each of these cards comes with 2 gigabytes of GDDR5 memory manufactured by Hynix Semiconductor.
The chips installed on the Radeon HD 6970 are labeled as H5GQ2H24MFR R0C. They have a voltage of 1.5 volts and a rated frequency of 6000 MHz. The Radeon HD 6950 is equipped with H5GQ2H24MFR T2C chips that have a voltage of 1.5 volts and a rated frequency of 5000 MHz. The actual memory frequency of the HD 6970 and HD 6950 is 5500 MHz and 5000 MHz, respectively. Thus, these XFX products do not differ from the reference products in this respect. Each card lowers its memory frequency to 600 MHz in 2D mode. The memory bus width is 256 bits.
Let’s compare the cards using GPU-Z:
We examined the cooling system installed on the Radeon HD 6970 (and 6950) in our earlier review, so we will limit ourselves to just posting its photo here.
It should be noted that the contact surface of the copper base of the XFX Radeon HD 6950's cooler was convex, and the cooler's blower wouldn't work smoothly. Its speed would increase or decrease abruptly.
Replacing the thermal interface on the GPU die and applying a thicker layer of it didn't help much. This is quite a common problem, so we didn't try to overclock that card. As for the XFX Radeon HD 6970, we could speed it up to 930/6000 MHz without increasing its voltage or tweaking its cooling. This is a normal result for such cards.