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GeForce GT 420 vs Radeon HD 5830

Intro

The GeForce GT 420 uses a 40 nm design. nVidia has clocked the core speed at 700 MHz. The GDDR3 memory is set to run at a speed of 900 MHz on this particular model. It features 48 SPUs as well as 8 Texture Address Units and 4 Rasterization Operator Units.

Compare all that to the Radeon HD 5830, which has a core clock speed of 800 MHz and a GDDR5 memory frequency of 1000 MHz. It also features a 256-bit memory bus, and uses a 40 nm design. It is comprised of 1120(224x5) SPUs, 56 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420 50 Watts
Radeon HD 5830 175 Watts
Difference: 125 Watts (250%)

Memory Bandwidth

In theory, the Radeon HD 5830 should be much faster than the GeForce GT 420 overall. (explain)

Radeon HD 5830 128000 MB/sec
GeForce GT 420 28800 MB/sec
Difference: 99200 (344%)

Texel Rate

The Radeon HD 5830 is quite a bit (about 700%) better at anisotropic filtering than the GeForce GT 420. (explain)

Radeon HD 5830 44800 Mtexels/sec
GeForce GT 420 5600 Mtexels/sec
Difference: 39200 (700%)

Pixel Rate

The Radeon HD 5830 will be a lot (more or less 357%) better at FSAA than the GeForce GT 420, and also should be capable of handling higher resolutions better. (explain)

Radeon HD 5830 12800 Mpixels/sec
GeForce GT 420 2800 Mpixels/sec
Difference: 10000 (357%)

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 HD 5830

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 HD 5830
Manufacturer nVidia AMD
Year September 2010 February 25, 2010
Code Name GF108 Cypress LE
Memory 2048 MB 1024 MB
Core Speed 700 MHz 800 MHz
Memory Speed 1800 MHz 4000 MHz
Power (Max TDP) 50 watts 175 watts
Bandwidth 28800 MB/sec 128000 MB/sec
Texel Rate 5600 Mtexels/sec 44800 Mtexels/sec
Pixel Rate 2800 Mpixels/sec 12800 Mpixels/sec
Unified Shaders 48 1120(224x5)
Texture Mapping Units 8 56
Render Output Units 4 16
Bus Type GDDR3 GDDR5
Bus Width 128-bit 256-bit
Fab Process 40 nm 40 nm
Transistors 585 million 2154 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 (counted in MB per second) that can be moved past the external memory interface in a second. It's calculated by multiplying the bus width by the speed of its memory. If it uses DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory 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 HD 5830

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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