GeForce GT 640 

Released June, 2012
  • 902 MHz
  • 1 GB DDR3
6.2 Out of 10

Explore 8 desktops with the GeForce GT 640
ZOTAC's cooler is a basic piece of metal, no fancy heatpipes.
by techPowerUp! (Jul, 2012)
Instead of going for a full-size HDMI output, ZOTAC chose to use a mini-HDMI output, adding a second dual-link DVI connector to the card.
by techPowerUp! (Jul, 2012)

GPUBoss Review Our evaluation of the GeForce GT 640 among Desktop GPUs


GeForce GT 640
Battlefield 3, Battlefield 4, Bioshock Infinite and 21 more


GeForce GT 640
T-Rex, Manhattan, Cloud Gate Factor, Sky Diver Factor and 1 more


GeForce GT 640
Face Detection, Ocean Surface Simulation and 3 more

Performance per Watt

GeForce GT 640
Battlefield 3, Battlefield 4, Bioshock Infinite and 32 more


GeForce GT 640
Battlefield 3, Battlefield 4, Bioshock Infinite and 32 more

Noise and Power

GeForce GT 640
TDP, Idle Power Consumption, Load Power Consumption and 2 more


Overall Score

GeForce GT 640

Benchmarks Real world tests of the GeForce GT 640

Bitcoin mining Data courtesy CompuBench

GeForce GT 640
25.61 mHash/s
GeForce GT 630
9.97 mHash/s
GeForce GT 730
35.62 mHash/s

Face detection Data courtesy CompuBench

GeForce GT 640
11.45 mPixels/s
GeForce GT 630
4.89 mPixels/s
GeForce GT 730
7.91 mPixels/s

Ocean surface simulation Data courtesy CompuBench

GeForce GT 640
295.41 frames/s
GeForce GT 730
166.83 frames/s
GeForce GT 630
203.54 frames/s

Fire Strike Factor Data courtesy FutureMark

GeForce GT 640

Sky Diver Factor Data courtesy FutureMark

GeForce GT 640

Cloud Gate Factor Data courtesy FutureMark

GeForce GT 640

Battlefield 4

GeForce GT 640

Metro: Last Light

GeForce GT 640

Reviews Word on the street for the GeForce GT 640

The orange port is a DVI-I port and the white port is a DVI-D port, and only the orange DVI-I port can be used to with an adapter to provide a VGA signal.

What People Are Saying Give it to me straight


Our benchmarks conclusively show that GT 640 is not a graphics card for gamers.
by techPowerUp! (Jul, 2012)
If you want to spend less, go for the HD 6670, which offers similar performance but costs only $65.
by techPowerUp! (Jul, 2012)
It seems that ZOTAC forgot to fine-tune the fan settings to the capabilities of their cooler, or they decided that low noise is not for low-end graphics card users.
by techPowerUp! (Jul, 2012)


While there are variants with 1 GB memory, ZOTAC has put 2 GB on the card, whether this makes much sense is something we will know at the end of the review.
by techPowerUp! (Jul, 2012)
They are specified to run at 933 MHz (1866 MHz DDR3 effective).
by techPowerUp! (Jul, 2012)
Clocks have remained at the NVIDIA default of 891 MHz GPU and 900 MHz memory.
by techPowerUp! (Jul, 2012)


As a result the card is one of the most power efficient options if you want to build an eco-friendly non-gaming system.
by techPowerUp! (Jul, 2012)
It's not NVIDIA's fault though, their design is power efficient.
by techPowerUp! (Jul, 2012)
Gaming power consumption is very reasonable too, but the card doesn't offer much in terms of gaming power, so these numbers are only of secondary importance here.
by techPowerUp! (Jul, 2012)

Memory Type

The DDR3 memory chips are made by Micron, and carry the model number MT41J128M16JT-107.
by techPowerUp! (Jul, 2012)
Unlike its high-end brethren, the card uses cheaper, but slower DDR3 memory, which you would also find on your mobo's memory modules, for example.
by techPowerUp! (Jul, 2012)


While it can handle some basic gaming at lower resolutions and low details, it has a hard time competing even with cards at a similar price point.
by techPowerUp! (Jul, 2012)
It makes perfect sense from a business standpoint though, because people still buy cards that have big numbers written on the package.
by techPowerUp! (Jul, 2012)

Specifications Full list of technical specs


GPU brand Nvidia
GPU name GK107
Market Desktop
Clock speed 902 MHz
Is dual GPU No
Reference card Nvidia GeForce GT 640 902 MHz 2 GB

raw performance

Shading units 384
Texture mapping units 32
Render output processors 16
SMX units 2
Pixel rate 7.22 GPixel/s
Texture rate 28.86 GTexel/s
Floating-point performance 692.7 GFLOPS


Memory clock speed 900 MHz
Effective memory clock speed 1,800 MHz
Memory bus 128 bit
Memory 1,024 MB
Memory type DDR3
Memory bandwidth 28.8 GB/s

noise and power

Idle noise level 46.4 dB
Load noise level 46.4 dB
Idle power consumption 104W
Load power consumption 208W
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Showing 1 comment.
Pretty nice card for a Budget fancy cases, too enclosed vents and low wattage PSU, i own the 1GB version, unfortunately you can't OC too much not matter what software you use. Still can play most of games up to date except for those IP's that demands (in my opinion) ridiculous specs, i could play BF4 with all in low and native res (1600 x 900), i know its just the kind of person who think: "why would i pay more money for something that i can accomplish with my current set"...maybe im saying this because im not a big fan of the HD hype, anyway its a matter of preferences, for example, right now im in the position of change my rig or maybe just the card only and only if i cant play SW Battlefront...XD (and thats why im here checking updated card specs lol).
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