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GeForce GT 420 vs Radeon HD 5450

Intro

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

Compare all that to the Radeon HD 5450, which comes with 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 Texture Address Units and 4 ROPs.

(No game benchmarks for this combination yet.)

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

As far as performance goes, the GeForce GT 420 should theoretically be a lot superior to 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 will be a little bit (approximately 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 should be a little bit (approximately 8%) more effective at FSAA than the Radeon HD 5450, and 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

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

Model GeForce GT 420 Radeon HD 5450
Manufacturer nVidia AMD
Year September 2010 February 4, 2010
Code Name GF108 Cedar PRO
Fab Process 40 nm 40 nm
Bus PCIe x16 PCIe 2.1 x16
Memory 2048 MB 512 MB
Core Speed 700 MHz 650 MHz
Shader Speed 1400 MHz (N/A) MHz
Memory Speed 900 MHz (1800 MHz effective) 800 MHz (1600 MHz effective)
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
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 4.1 OpenGL 3.2
Power (Max TDP) 50 watts 19 watts
Shader Model 5.0 5.0
Bandwidth 28800 MB/sec 12800 MB/sec
Texel Rate 5600 Mtexels/sec 5200 Mtexels/sec
Pixel Rate 2800 Mpixels/sec 2600 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the maximum amount of information (in units of MB per second) that can be transferred across the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better 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 is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the card will be at handling 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 that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

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