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GeForce GT 340 1GB vs GeForce GT 640 DDR3

Intro

The GeForce GT 340 1GB has a GPU clock speed of 550 MHz, and the 1024 MB of GDDR5 RAM is set to run at 850 MHz through a 128-bit bus. It also is comprised of 96 SPUs, 32 Texture Address Units, and 8 ROPs.

Compare all of that to the GeForce GT 640 DDR3, which makes use of a 28 nm design. nVidia has set the core speed at 900 MHz. The DDR3 RAM runs at a frequency of 1782 MHz on this specific card. It features 384 SPUs as well as 32 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3 65 Watts
GeForce GT 340 1GB 69 Watts
Difference: 4 Watts (6%)

Memory Bandwidth

Theoretically speaking, the GeForce GT 640 DDR3 is 5% quicker than the GeForce GT 340 1GB in general, because of its greater bandwidth. (explain)

GeForce GT 640 DDR3 57024 MB/sec
GeForce GT 340 1GB 54400 MB/sec
Difference: 2624 (5%)

Texel Rate

The GeForce GT 640 DDR3 will be quite a bit (about 64%) more effective at anisotropic filtering than the GeForce GT 340 1GB. (explain)

GeForce GT 640 DDR3 28800 Mtexels/sec
GeForce GT 340 1GB 17600 Mtexels/sec
Difference: 11200 (64%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce GT 640 DDR3 is superior to the GeForce GT 340 1GB, by a large margin. (explain)

GeForce GT 640 DDR3 14400 Mpixels/sec
GeForce GT 340 1GB 4400 Mpixels/sec
Difference: 10000 (227%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

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GeForce GT 340 1GB

Amazon.com

Check prices at:

GeForce GT 640 DDR3

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model GeForce GT 340 1GB GeForce GT 640 DDR3
Manufacturer nVidia nVidia
Year February 2010 June 2012
Code Name GT215 GK107
Memory 1024 MB 2048 MB
Core Speed 550 MHz 900 MHz
Memory Speed 3400 MHz 3564 MHz
Power (Max TDP) 69 watts 65 watts
Bandwidth 54400 MB/sec 57024 MB/sec
Texel Rate 17600 Mtexels/sec 28800 Mtexels/sec
Pixel Rate 4400 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 96 384
Texture Mapping Units 32 32
Render Output Units 8 16
Bus Type GDDR5 DDR3
Bus Width 128-bit 128-bit
Fab Process 40 nm 28 nm
Transistors 727 million 1300 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 11.0
OpenGL Version OpenGL 3.3 OpenGL 4.2

Memory Bandwidth: Bandwidth is the maximum amount of information (in units of MB per second) that can be moved across the external memory interface in one second. It's calculated by multiplying the bus width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This number is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

Hide Prices

GeForce GT 340 1GB

Amazon.com

Check prices at:

GeForce GT 640 DDR3

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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