ZOTAC GeForce GT 640 ZONE Edition Fanless GPU

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Noise & Cooling

Comparison: GPU Test System (Load)
Model
GPU Temp
SPL @1m
Sapphire HD 7750 Ultimate*
77°C
12~13 dBA
ZOTAC GT 640 ZONE Edition*
(sys. fans on med)
98°C
18 dBA
ASUS GTS 450 DirectCU
66°C
26 dBA
ZOTAC GT 640 ZONE Edition*
(sys. fans on high)
89°C
26 dBA
AMD HD 6570
90°C
27~28 dBA
System fans on low (12~13 dBA@1m) unless otherwise noted.
Ambient temperature: 22°C
*passively cooled

The passively-cooled Sapphire HD 7750 Ultimate occupies the same price-point as the GT 640 ZONE Edition, making an appropriate card for a direct comparison. It simply puts the GT 640 to shame, maintaining a load temperature under 80°C with our silent 12~13 dBA@1m fan speed setting. The GT 640 ran more than 21°C hotter with our quiet 18 dBA@1m setting, and was still 12°C behind using our loud 26 dBA@1m setting.

The ASUS GTS 450 DirectCU, which is in a similar class as the GT 640, was also more noise efficient. Despite having an an over-aggressive fan, its system noise level on load also hit 26 dBA@1m but it had the advantage of having 23°C of headroom.

3D Performance

Our synthetic benchmarks paint the GT 640 as a solid budget contender, falling somewhere between the GDDR5-equipped Radeon HD 6570 and GeForce GTS 450 in performance.

In our two easier game benchmarks, Crysis and Lost Planet 2, the GT 640 managed to produce playable frame rates at 1680x1050 resolution with medium detail. The results were disappointing however when you consider how well the HD 6570 managed to keep up.

Sniper Elite V2 and Aliens vs. Predator presented more difficult challenges for the GT 640, requiring us to reduce the detail level in Sniper Elite V2 to low and drop the Aliens vs. Predator resolution to 1440x900. And once again, the GT 640 was unable to beat the HD 6570.



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