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GeForce GT 240 GDDR5 vs GeForce GT 640 DDR3

Intro

The GeForce GT 240 GDDR5 comes with core speeds of 550 MHz on the GPU, and 850 MHz on the 512 MB of GDDR5 RAM. It features 96 SPUs as well as 32 Texture Address Units and 8 ROPs.

Compare all that to the GeForce GT 640 DDR3, which has a clock frequency of 900 MHz and a DDR3 memory frequency of 1782 MHz. It also makes use of a 128-bit memory bus, and makes use of a 28 nm design. It is made up of 384 SPUs, 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 240 GDDR5 70 Watts
Difference: 5 Watts (8%)

Memory Bandwidth

As far as performance goes, the GeForce GT 640 DDR3 should in theory be just a bit superior to the GeForce GT 240 GDDR5 in general. (explain)

GeForce GT 640 DDR3 57024 MB/sec
GeForce GT 240 GDDR5 54400 MB/sec
Difference: 2624 (5%)

Texel Rate

The GeForce GT 640 DDR3 should be quite a bit (approximately 64%) more effective at anisotropic filtering than the GeForce GT 240 GDDR5. (explain)

GeForce GT 640 DDR3 28800 Mtexels/sec
GeForce GT 240 GDDR5 17600 Mtexels/sec
Difference: 11200 (64%)

Pixel Rate

The GeForce GT 640 DDR3 is much (more or less 227%) better at FSAA than the GeForce GT 240 GDDR5, and also will be able to handle higher resolutions without slowing down too much. (explain)

GeForce GT 640 DDR3 14400 Mpixels/sec
GeForce GT 240 GDDR5 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 240 GDDR5

Amazon.com

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GeForce GT 640 DDR3

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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 240 GDDR5 GeForce GT 640 DDR3
Manufacturer nVidia nVidia
Year Novermber 2009 June 2012
Code Name GT215 GK107
Memory 512 MB 2048 MB
Core Speed 550 MHz 900 MHz
Memory Speed 3400 MHz 3564 MHz
Power (Max TDP) 70 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 289 million 1300 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 11.0
OpenGL Version OpenGL 3.2 OpenGL 4.2

Memory Bandwidth: Bandwidth is the largest amount of information (in units of MB per second) that can be transferred across the external memory interface in one second. It is calculated by multiplying the interface width by its memory clock speed. If the card has DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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GeForce GT 240 GDDR5

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.

Comments

2 Responses to “GeForce GT 240 GDDR5 vs GeForce GT 640 DDR3”
Kakkarot says:

You have an error in GT640 description... 1782MHz of RAM speed is... its effective performance, not a real one. So its real memory bandwith is much lower than that of DDR5 GT240

dbzsucks says:

leave it to a db fanboy to say something isn't so and offer no actual proof or numbers to back it up. must still be sore he got whupped by superman.

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