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GeForce GT 420 vs Radeon R7 240

Intro

The GeForce GT 420 uses a 40 nm design. nVidia has clocked the core frequency at 700 MHz. The GDDR3 memory is set to run at a speed of 900 MHz on this specific model. It features 48 SPUs along with 8 Texture Address Units and 4 Rasterization Operator Units.

Compare those specs to the Radeon R7 240, which comes with GPU clock speed of 730 MHz, and 2048 MB of DDR3 RAM running at 900 MHz through a 128-bit bus. It also is made up of 320 Stream Processors, 20 TAUs, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 240 30 Watts
GeForce GT 420 50 Watts
Difference: 20 Watts (67%)

Memory Bandwidth

Both cards have exactly the same bandwidth, so in theory they should perform the same. (explain)

Texel Rate

The Radeon R7 240 is quite a bit (approximately 161%) faster with regards to texture filtering than the GeForce GT 420. (explain)

Radeon R7 240 14600 Mtexels/sec
GeForce GT 420 5600 Mtexels/sec
Difference: 9000 (161%)

Pixel Rate

The Radeon R7 240 should be much (more or less 109%) more effective at FSAA than the GeForce GT 420, and also should be capable of handling higher resolutions more effectively. (explain)

Radeon R7 240 5840 Mpixels/sec
GeForce GT 420 2800 Mpixels/sec
Difference: 3040 (109%)

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 420

Amazon.com

Check prices at:

Radeon R7 240

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 420 Radeon R7 240
Manufacturer nVidia AMD
Year September 2010 October 2013
Code Name GF108 Oland PRO
Memory 2048 MB 2048 MB
Core Speed 700 MHz 730 MHz
Memory Speed 1800 MHz 1800 MHz
Power (Max TDP) 50 watts 30 watts
Bandwidth 28800 MB/sec 28800 MB/sec
Texel Rate 5600 Mtexels/sec 14600 Mtexels/sec
Pixel Rate 2800 Mpixels/sec 5840 Mpixels/sec
Unified Shaders 48 320
Texture Mapping Units 8 20
Render Output Units 4 8
Bus Type GDDR3 DDR3
Bus Width 128-bit 128-bit
Fab Process 40 nm 28 nm
Transistors 585 million 1040 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.2
OpenGL Version OpenGL 4.1 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the largest amount of information (in units of MB per second) that can be moved across the external memory interface within a second. It's calculated by multiplying the bus width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total number of texture units by the core speed of the chip. The better this number, 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 maximum amount of pixels that 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 colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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GeForce GT 420

Amazon.com

Check prices at:

Radeon R7 240

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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