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GeForce GT 240 GDDR5 vs GeForce GT 640 DDR3

Intro

The GeForce GT 240 GDDR5 uses a 40 nm design. nVidia has set the core speed at 550 MHz. The GDDR5 memory runs at a speed of 850 MHz on this particular card. It features 96 SPUs as well as 32 TAUs and 8 ROPs.

Compare that to the GeForce GT 640 DDR3, which comes with a clock speed of 900 MHz and a DDR3 memory speed of 1782 MHz. It also uses a 128-bit bus, and uses a 28 nm design. It is made up of 384 SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

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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

Theoretically, the GeForce GT 640 DDR3 should perform a little bit faster than the GeForce GT 240 GDDR5 overall. (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 will be a lot (approximately 64%) better at texture 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 will be much (about 227%) more effective at anti-aliasing than the GeForce GT 240 GDDR5, and capable of handling higher screen resolutions without losing too much performance. (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

Amazon.com

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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: Memory bandwidth is the maximum amount of data (in units of megabytes per second) that can be transferred across the external memory interface within a second. It's worked out by multiplying the interface width by the speed of its memory. If the card has DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

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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