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GeForce GT 420 vs Radeon HD 5450


Intro

The GeForce GT 420 has a GPU clock speed of 700 MHz, and the 2048 MB of GDDR3 RAM runs at 900 MHz through a 128-bit bus. It also features 48 SPUs, 8 TAUs, and 4 Raster Operation Units.

Compare all of that to the Radeon HD 5450, which comes with a core clock frequency of 650 MHz and a DDR3 memory speed of 800 MHz. It also features a 64-bit memory bus, and uses a 40 nm design. It features 80(16x5) SPUs, 8 Texture Address Units, and 4 Raster Operation 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

Performance-wise, the GeForce GT 420 should theoretically be quite a bit better than the Radeon HD 5450 in general. (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%) faster with regards to 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 will be a little bit (about 8%) faster with regards to full screen anti-aliasing than the Radeon HD 5450, and also should be able to handle higher 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

GeForce GT 420

Radeon HD 5450

Specifications

Display 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: Bandwidth is the largest amount of information (in units of MB per second) that can be moved across the external memory interface in a second. It is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR memory, 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 AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

GeForce GT 420

Radeon HD 5450

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