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GeForce GT 240 GDDR5 1GB vs GeForce GT 420

Intro

The GeForce GT 240 GDDR5 1GB uses a 40 nm design. nVidia has set the core speed at 550 MHz. The GDDR5 memory is set to run at a frequency of 850 MHz on this specific card. It features 96 SPUs along with 32 Texture Address Units and 8 Rasterization Operator Units.

Compare that to the GeForce GT 420, which features core clock speeds of 700 MHz on the GPU, and 900 MHz on the 2048 MB of GDDR3 RAM. It features 48 SPUs along with 8 Texture Address Units and 4 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420 50 Watts
GeForce GT 240 GDDR5 1GB 70 Watts
Difference: 20 Watts (40%)

Memory Bandwidth

As far as performance goes, the GeForce GT 240 GDDR5 1GB should in theory be much better than the GeForce GT 420 in general. (explain)

GeForce GT 240 GDDR5 1GB 54400 MB/sec
GeForce GT 420 28800 MB/sec
Difference: 25600 (89%)

Texel Rate

The GeForce GT 240 GDDR5 1GB should be quite a bit (approximately 214%) faster with regards to AF than the GeForce GT 420. (explain)

GeForce GT 240 GDDR5 1GB 17600 Mtexels/sec
GeForce GT 420 5600 Mtexels/sec
Difference: 12000 (214%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce GT 240 GDDR5 1GB is a better choice, and very much so. (explain)

GeForce GT 240 GDDR5 1GB 4400 Mpixels/sec
GeForce GT 420 2800 Mpixels/sec
Difference: 1600 (57%)

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 1GB

Amazon.com

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GeForce GT 420

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 1GB GeForce GT 420
Manufacturer nVidia nVidia
Year November 2009 September 2010
Code Name GT215 GF108
Memory 1024 MB 2048 MB
Core Speed 550 MHz 700 MHz
Memory Speed 3400 MHz 1800 MHz
Power (Max TDP) 70 watts 50 watts
Bandwidth 54400 MB/sec 28800 MB/sec
Texel Rate 17600 Mtexels/sec 5600 Mtexels/sec
Pixel Rate 4400 Mpixels/sec 2800 Mpixels/sec
Unified Shaders 96 48
Texture Mapping Units 32 8
Render Output Units 8 4
Bus Type GDDR5 GDDR3
Bus Width 128-bit 128-bit
Fab Process 40 nm 40 nm
Transistors 289 million 585 million
Bus PCIe x16 PCIe x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.2 OpenGL 4.1

Memory Bandwidth: Bandwidth is the maximum amount of data (measured in megabytes per second) that can be transported past the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This figure is calculated by multiplying the total amount of texture units by the core 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 applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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GeForce GT 240 GDDR5 1GB

Amazon.com

Check prices at:

GeForce GT 420

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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