ZOTAC GeForce GT 520 1 GB 11

ZOTAC GeForce GT 520 1 GB Review

Value & Conclusion »


To find the maximum overclock of our card we used a combination of GPUTool and our benchmarking suite.
The overclocks listed in this section were achieved with the default fan and voltage settings as defined in the VGA BIOS. Please note that every single sample overclocks differently, that's why our results here can only serve as a guideline for what you can expect from your card.

Overclocks of our card are 995 MHz core (23% overclock) and 885 MHz Memory (11% overclock). GPU overclocking potential is pretty amazing, I think the chip might actually be able to overclock a bit more, to around 1020 MHz. But every clock speed above 995 MHz resulted in the card switching to clocks of 810 MHz in 3D.
Memory overclocking is limited by the DDR3 memory chips.

Overclocked Performance

Using these clock frequencies we ran a quick test of Call of Duty 4 to evaluate the gains from overclocking.

Actual 3D performance gained from overclocking is 17.6%.


Temperatures in both idle and load are low, which means ZOTAC could have quietened down the fan some more to provide an outstanding low noise office PC / HTPC experience.

Clock Profiles

Modern graphics cards have several clock profiles that are selected to balance power draw and performance requirements.
The following table lists the clock settings for major performance scenarios and the GPU voltage that we measured. We measure on the pins of a coil or capacitor near the GPU voltage regulator.

GPU Voltage
Desktop270 MHz405 MHz0.95 V
Blu-ray Playback270 MHz405 MHz0.95 V
3D Load810 MHz800 MHz1.13 V
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