Zotac GeForce GT 640 2GB (ZT-60201-10L)
The smallest graphics card in this review, the Zotac GeForce GT 640 is packed into a compact box. The product’s key features are indicated on the top of the packaging.
This product comes with the same accessories as the Zotac GeForce GTX 650 Ti AMP! Edition excepting the power cable which is not necessary here.
Manufactured in China, the card comes with a 2-year warranty. Its retail price is $89.
Like a typical entry-level product, the Zotac GeForce GT 640 looks exceedingly simple. One half of its short 145mm PCB is covered by an aluminum heatsink with a small orange fan.
The single-slot design makes this card perfect for compact HTPCs which may be occasionally used for running some older games.
The Zotac GeForce GT 640 is equipped with two dual-link DVI outputs and one mini-HDMI 1.4a.
Its power requirements are so low that even the short PCB is largely uninhabited although the memory chips populate its face side.
The power system includes two phases whereas the GPU is equipped with a plastic frame to protect the fragile die which is a mere 118 sq. mm in size.
The GK107 is exactly one half of the GK106 with half the shader processors (384) and half the texture-mapping units (32). The number of ROPs has remained the same (16). The GPU is clocked at 902 MHz.
The Zotac GeForce GT 640 carries 2 gigabytes of DDR3 memory in four chips from Micron (2EK12 D9PRS).
The memory clock rate is 1782 MHz while the rest of the specs are as follows:
The card is cooled by a simple aluminum heatsink with a 60mm Everflow T126010SU fan.
It keeps the GPU as cool as 54°C at peak load, though.
As for overclocking potential, we managed to increase the GPU and memory frequencies of our Zotac GeForce GT 640 by 160 and 200 MHz, respectively.
The final frequencies of 1062/2182 MHz are good enough for such a simple and cheap graphics card with DDR3 memory.
The overclocked GPU grew 5°C hotter, reaching 59°C.