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GeForce GT 420 vs Radeon HD 5450

Intro

The GeForce GT 420 has a GPU core speed of 700 MHz, and the 2048 MB of GDDR3 RAM is set to run at 900 MHz through a 128-bit bus. It also features 48 Stream Processors, 8 Texture Address Units, and 4 ROPs.

Compare all of that to the Radeon HD 5450, which has core speeds of 650 MHz on the GPU, and 800 MHz on the 512 MB of DDR3 RAM. It features 80(16x5) SPUs along with 8 TAUs and 4 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5450 19 Watts
GeForce GT 420 50 Watts
Difference: 31 Watts (163%)

Memory Bandwidth

Theoretically, the GeForce GT 420 should be a lot faster than the Radeon HD 5450 overall. (explain)

GeForce GT 420 28800 MB/sec
Radeon HD 5450 12800 MB/sec
Difference: 16000 (125%)

Texel Rate

The GeForce GT 420 is a small bit (about 8%) more effective at texture filtering than the Radeon HD 5450. (explain)

GeForce GT 420 5600 Mtexels/sec
Radeon HD 5450 5200 Mtexels/sec
Difference: 400 (8%)

Pixel Rate

The GeForce GT 420 should be just a bit (approximately 8%) more effective at full screen anti-aliasing than the Radeon HD 5450, and should be capable of handling higher screen resolutions without slowing down too much. (explain)

GeForce GT 420 2800 Mpixels/sec
Radeon HD 5450 2600 Mpixels/sec
Difference: 200 (8%)

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

Radeon HD 5450

Amazon.com

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 HD 5450
Manufacturer nVidia AMD
Year September 2010 February 4, 2010
Code Name GF108 Cedar PRO
Memory 2048 MB 512 MB
Core Speed 700 MHz 650 MHz
Memory Speed 1800 MHz 1600 MHz
Power (Max TDP) 50 watts 19 watts
Bandwidth 28800 MB/sec 12800 MB/sec
Texel Rate 5600 Mtexels/sec 5200 Mtexels/sec
Pixel Rate 2800 Mpixels/sec 2600 Mpixels/sec
Unified Shaders 48 80(16x5)
Texture Mapping Units 8 8
Render Output Units 4 4
Bus Type GDDR3 DDR3
Bus Width 128-bit 64-bit
Fab Process 40 nm 40 nm
Transistors 585 million 292 million
Bus PCIe x16 PCIe 2.1 x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 4.1 OpenGL 3.2

Memory Bandwidth: Memory bandwidth is the largest amount of information (measured in megabytes per second) that can be transferred past the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the video card will be at handling 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 could possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

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