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Radeon HD 4830 1GB vs Radeon HD 5450

Intro

The Radeon HD 4830 1GB features clock speeds of 575 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR4 RAM. It features 640(128x5) SPUs along with 32 TAUs and 16 ROPs.

Compare all that to the Radeon HD 5450, which comes with a core clock speed 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 is made up of 80(16x5) SPUs, 8 TAUs, and 4 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5450 19 Watts
Radeon HD 4830 1GB 95 Watts
Difference: 76 Watts (400%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4830 1GB should in theory be quite a bit superior to the Radeon HD 5450 in general. (explain)

Radeon HD 4830 1GB 57600 MB/sec
Radeon HD 5450 12800 MB/sec
Difference: 44800 (350%)

Texel Rate

The Radeon HD 4830 1GB should be a lot (more or less 254%) more effective at anisotropic filtering than the Radeon HD 5450. (explain)

Radeon HD 4830 1GB 18400 Mtexels/sec
Radeon HD 5450 5200 Mtexels/sec
Difference: 13200 (254%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 4830 1GB is the winner, by a large margin. (explain)

Radeon HD 4830 1GB 9200 Mpixels/sec
Radeon HD 5450 2600 Mpixels/sec
Difference: 6600 (254%)

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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Radeon HD 4830 1GB

Amazon.com

Check prices at:

Radeon HD 5450

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 Radeon HD 4830 1GB Radeon HD 5450
Manufacturer AMD AMD
Year Oct 21, 2008 February 4, 2010
Code Name RV770 LE Cedar PRO
Memory 1024 MB 512 MB
Core Speed 575 MHz 650 MHz
Memory Speed 1800 MHz 1600 MHz
Power (Max TDP) 95 watts 19 watts
Bandwidth 57600 MB/sec 12800 MB/sec
Texel Rate 18400 Mtexels/sec 5200 Mtexels/sec
Pixel Rate 9200 Mpixels/sec 2600 Mpixels/sec
Unified Shaders 640(128x5) 80(16x5)
Texture Mapping Units 32 8
Render Output Units 16 4
Bus Type GDDR4 DDR3
Bus Width 256-bit 64-bit
Fab Process 55 nm 40 nm
Transistors 956 million 292 million
Bus PCIe 2.0 x16 PCIe 2.1 x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 3.2

Memory Bandwidth: Memory bandwidth is the max amount of data (in units of megabytes per second) that can be moved across the external memory interface in one second. It's calculated by multiplying the bus width by its memory clock speed. If the card has DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number 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 is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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Radeon HD 4830 1GB

Amazon.com

Check prices at:

Radeon HD 5450

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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