Articles: Graphics

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The GPU was manufactured in Taiwan on the 19th week of 2013 (early May). It is revision A2:

As opposed to the standard GeForce GTX 770 which clocks its GPU at 1046/1085 MHz in 3D applications, the EVGA GeForce GTX 770 Superclocked ACX has its GPU running at 1111/1163 MHz (+6.2%). So, we’ve got some factory overclocking here. Moreover, according to our monitoring data, the GPU clock rate would peak up to 1215 MHz after we had set the Power Target at its maximum. The GPU die of our sample of the EVGA card has a very high ASIC quality of 85.5%.

It is the highest quality among all GeForce GTX 770s we've tested so far.

The graphics card is equipped with two gigabytes of GDDR5 memory in eight chips located on the face side of the PCB. These are Samsung Semiconductor's K4G20325FD-FC28 chips:

Their clock rate in 3D mode is 7000 MHz. The memory bus is 256-bit. In 2D mode the clock rate is dropped to 648 MHz. So, the EVGA is not pre-overclocked in terms of graphics memory.

We discussed EVGA’s Active Cooling Xtreme system in our review of the EVGA GeForce GTX 780 Superclocked ACX. The cooler is absolutely the same here.


It consists of a nickel-plated heatsink with four 8mm and one 6mm heat pipe, two fans, a plastic casing, and a heat-spreading plate on the memory chips and power components.

The outermost plates are perforated:

So, the cooler is identical to the one we saw on the top-end EVGA card. It has the same fans working at the same speed.

Hereinafter, to check out the cards temperatures we used five runs of the pretty resource-hungry Aliens vs. Predator (2010) benchmark at the highest visual quality settings, at a resolution of 2560x1440 pixels. We used 16x anisotropic filtering but no MSAA 4x. We used MSI Afterburner 3.0.0 beta 14 and GPU-Z version 0.7.2 for monitoring of temperatures inside the closed system case, which configuration is discussed in detail in the corresponding chapter of the roundup. All tests were performed at 24-25°C room temperature.

It was highly efficient on EVGA’s version of GeForce GTX 780. Now let’s see how it copes with the GTX 770 when its fans are regulated automatically or work at their maximum speed.

Automatic fan mode

Maximum fan speed

The ACX cooler does better on the colder GTX 770 than on the GTX 780, as might be expected. When regulated automatically, the fans work at 1950 RPM and the GPU is no hotter than 70°C. At the maximum speed of 3330 RPM, the GPU is only 59°C hot. The cooler is highly efficient without any doubt.

It would be wrong not to overclock a graphics card with such a high-performance cooler, so we managed to increase the GPU frequency by 90 MHz and the memory frequency by 980 MHz. The GPU voltage was left at its default level.

The resulting frequencies of our EVGA GeForce GTX 770 Superclocked ACX were 1201/1253/7992 MHz.

In 3D mode the GPU frequency would peak up to 1293 MHz, but the cooler didn’t have any problems.

The temperature of 72°C at a fan speed of 2040 RPM is an excellent result for such a fast graphics card. We can only add that increasing the GPU voltage by the permissible maximum of 120 mV helped us raise the frequency by a mere 20 MHz. That’s why we didn’t test the card at the increased voltage.

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