Silverstone Zeus ST56ZF
We tested the power supply out with the latest generation of CPUs and Video
Cards to ensure the “future-proofness” of it. Also, with the high
power consumption of the latest Dual Core CPU and Dual High-end 7800 GTX in
SLI, we can really test out the maximum capability of the power unit.
AMD Athlon 64 Dual Core X2 4800+, 2400Mhz
2 x NVIDIA 7800 GTX 256MB in SLI (430/1200Mhz)
We started out with a more basic system, running a single 7800 GTX
instead of 2.
First, we ran the system on a single threaded application 3D mark 05.As it
is only single threaded, running it alone only loads 1 core of the dual core
and the 7800GTX.
Measuring with a Clamp Amp meter from the AC current, we recorded
around 1.46Amps drawn by the power supply:
It is drawing around 320w of power. Assuming 80% efficiency, it is supplying
around 256w of power for the system when running 3d mark 05
with current setup.
Measuring with a multimeter, the 12v rail only drops a bit under
load, from 12.16v to 12.12v. This is quite decent and the with 12v rail staying
above 12v, this is a good sign.
This is with only 1 core loaded and 1 7800GTX. In order to load
both the cores, we ran 2 instances of prime 95 in the background. Then we started
3D Mark 05 in order to load the 7800GTX as well.
Current drawn goes up to 1.7Amps meaning about 374w of power drawn. Assuming
80% efficiency, 299w of power is supplied. System is stable
even after looping the benchmark for 2 hours.