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GeForce GT 420 vs Radeon HD 5450

Intro

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

Compare those specs to the Radeon HD 5450, which comes with GPU core speed of 650 MHz, and 512 MB of DDR3 RAM running at 800 MHz through a 64-bit bus. It also features 80(16x5) SPUs, 8 TAUs, and 4 ROPs.

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

The GeForce GT 420, in theory, should be much faster 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 should be a small bit (about 8%) more effective at AF than the Radeon HD 5450. (explain)

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

Pixel Rate

If running with a high resolution is important to you, then the GeForce GT 420 is the winner, but it probably won't make a huge difference. (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 data (measured in MB per second) that can be moved over the external memory interface within a second. The number is calculated by multiplying the bus width by its memory speed. If the card has DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

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