On the front side of the PCB, under heating
pads, there are 12 FCBGA chipsets of GDDR5 memory with a total capacity of 3
gigabytes. Samsung's semiconductor chip is marked K4G20325FD-FC03
Samsung's
Semiconductor Chip
In 3D mode, the GeForce GTX 780 has memory
frequency of 6008 MHz. Doubles with 384-bit bus, this gives maximum bandwidth
of 288.4GB/s, as the Titan.
The
parameters of the Nvidia GeForce GTX 780
The cooling system is also a copy of
Titan's. It has a vapor chamber in its base, an aluminum radiator, a metal
frame and a radial fan with optimum rotational speed.
The
cooling system
Hot air from the cooling escapes through
the computer case.
The
hot air escapes through the computer case
The GeForce GTX 780 has a fan compatible
with the adjustment of the algorithm, so the fan changes its speed smoothly
under 3D loads.
The
fan changes its speed smoothly under 3D loads
To check the temperature of the card we
used 5 runs of Alien vs Predator (2010) benchmark at the highest quality
images, at a resolution of 2560x1440 pixels, and with 16x anisotropic filtering
and MSAA 4x.
Alien
vs Predator (2010) benchmark
We used the MSI Afterburn 3.0.0 beta 10 and
GPU-Z 0.7.1 for monitoring the temperature inside a closed system case, with
the configuration will be discussed in detail in following chapters of review.
All tests were conducted at room temperature of 25°C.
With the cooling fan is adjusted
automatically, the GPU quickly heats up to a temperature of 82°C and maintains
at that level during the test session. The fans rose to 2350 RPM to avoid an
increase in temperature.
Automatic
and maximum fan speed mode
When radial fan rotates at max 4,270 RPM;
the GPU only heats at 57°C. We can also note that the highest GPU clock rate is
1,006 instead of 902 MHz during our testing session (power source and the
target temperature is set at the maximum level). That's GPU Boost 2.0 for you.
The noise level of the cooling device was
measured between 1:00 and 3:00 PM in a big closed room about 20 m2 by using
CENTER-321 electronic noise meter. The noise level of each cooler was tested
outside the system case when the only noise sources in the lab were the cooler
and its fan. The noise meter was mounted on a tripod and 150mm away from the
fan impeller. The examined cooling system was placed at the edge of the table
on a sheet of polyurethane foam. The lowest noise parameter that our noise
meter can read is 29.8 dBA and the subjectively comfortable noise level in
these testing conditions was around 36 dBA (do not mix it up with low noise
level). The rotational speed of the impellers was adjusted in entire supported
range of in-house controller by changing the voltage with 0.5 V increment.
The noise level of the Nvidia GeForce GTX
780 is compared in the following chart with the AMD Radeon HD 7970 GHz Edition.
Noise
level comparison chart of Nvidia GeForce GTX 780 with the AMD Redeon HD 7970
GHz Edition
In fact, Nvidia was quiet in the entire
speed range. Even at the maximum speed of the impeller, the GeForce GTX 780
wasn't as noisy as Radeon 7970 GHz Editon. On the other hand, the new card
can't be called quiet for 3D applications, for 3-5 minutes in the benchmark or
3D games, the sound of the GTX 780's cooler will rise above the noise of the
computer. At 2350 RPM as we saw above in the noise level test was too high for
the card to be called comfortable. Only in 2D mode, the new GeForce GTX 780 was
quiet and got lost in the noise of the computer. Hopefully the original GeForce
GTX 780 with a replacement cooler that was recently announced will be both cool
and quiet.
Overclocking capability
We tested the overclocking capability of
our GeForce GTX 780 using EVGA Precision X version 4.2.0. Power and the
temperature goal are set at the maximum level.
The
overclocking settings
For the temperature not to interfere with
our overclocking experiments, we set the fan at 75% speed, which was about 3200
RPM. With a cooler like this, the GPU's temperature was no higher than 71°C,
even at a very high level of noise.
Finally, we try to increase the frequency
of the graphics card to 1,018/1,057/7,168 MHz.
The
parameters of the Nvidia GeForce GTX 780
The overclocked GPU will run at 1150 MHz in
our test session.
The
overclocked GPU will run at 1150 MHz
We predict that the results are quite good,
though not a record-breaking, the results of GeForce GTX 780 didn't have any
change.
Power Consumption
We've measured the power consumption of our
test, which is equipped with multiple graphics cards use the multifunction
Zalman ZM-MFC3 which can record the power that a PC (no monitor ) drawled out
from a wall outlet. There are two prototypes: 2D (edit text in Microsoft Word
or surf the web) and 3D. In the latter case, loads were generated by four plays
running in the "Swamp" demo scene of Crysis 3 at 2,560x1,440 with
maximum visual settings but there is no MSAA.
Power consumption of the GeForce GTX 780's
configuration is compared with the configuration includes an ASUS GeForce GTX
680 DirectCU II TOP (at GTX 680's standard clock rate) and a reference NVIDIA
GeForce GTX Titan model.
Power
Consumption graph
The GeForce GTX 780 needs more power than
its predecessor, its configuration consumes 74 watts more than the GTX 680's
configuration. When GTX 780 was overclocked, its configuration can almost be
comparable to the GeForce GTX Titan in terms of power consumption. The
difference between the Radeon HD GHz Edition is not large, only 18 watts under
maximum load.
