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GeForce GT 420 vs Radeon R9 380 4G

Intro

The GeForce GT 420 has a clock speed of 700 MHz and a GDDR3 memory speed of 900 MHz. It also makes use of a 128-bit memory bus, and uses a 40 nm design. It features 48 SPUs, 8 Texture Address Units, and 4 ROPs.

Compare those specifications to the Radeon R9 380 4G, which makes use of a 28 nm design. AMD has clocked the core frequency at 970 MHz. The GDDR5 memory is set to run at a frequency of 1425 MHz on this model. It features 1792 SPUs along with 112 Texture Address Units and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420 50 Watts
Radeon R9 380 4G 190 Watts
Difference: 140 Watts (280%)

Memory Bandwidth

In theory, the Radeon R9 380 4G will be 533% faster than the GeForce GT 420 in general, due to its higher bandwidth. (explain)

Radeon R9 380 4G 182400 MB/sec
GeForce GT 420 28800 MB/sec
Difference: 153600 (533%)

Texel Rate

The Radeon R9 380 4G will be a lot (more or less 1840%) faster with regards to AF than the GeForce GT 420. (explain)

Radeon R9 380 4G 108640 Mtexels/sec
GeForce GT 420 5600 Mtexels/sec
Difference: 103040 (1840%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon R9 380 4G is superior to the GeForce GT 420, and very much so. (explain)

Radeon R9 380 4G 31040 Mpixels/sec
GeForce GT 420 2800 Mpixels/sec
Difference: 28240 (1009%)

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 R9 380 4G

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 R9 380 4G
Manufacturer nVidia AMD
Year September 2010 June 2015
Code Name GF108 Antigua PRO
Memory 2048 MB 4096 MB
Core Speed 700 MHz 970 MHz
Memory Speed 1800 MHz 5700 MHz
Power (Max TDP) 50 watts 190 watts
Bandwidth 28800 MB/sec 182400 MB/sec
Texel Rate 5600 Mtexels/sec 108640 Mtexels/sec
Pixel Rate 2800 Mpixels/sec 31040 Mpixels/sec
Unified Shaders 48 1792
Texture Mapping Units 8 112
Render Output Units 4 32
Bus Type GDDR3 GDDR5
Bus Width 128-bit 256-bit
Fab Process 40 nm 28 nm
Transistors 585 million 5000 million
Bus PCIe x16 PCIe 3.0 ×16
DirectX Version DirectX 11 DirectX 12.0
OpenGL Version OpenGL 4.1 OpenGL 4.5

Memory Bandwidth: Bandwidth is the max amount of information (counted in megabytes per second) that can be transported over the external memory interface in one second. The number is calculated by multiplying the interface width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's 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 are applied per second. This is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

GeForce GT 420

Amazon.com

Check prices at:

Radeon R9 380 4G

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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