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Radeon HD 4870 512MB vs Radeon HD 5450

Intro

The Radeon HD 4870 512MB comes with a clock frequency of 750 MHz and a GDDR5 memory frequency of 900 MHz. It also uses a 256-bit bus, and makes use of a 55 nm design. It is comprised of 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

Compare those specs to the Radeon HD 5450, which uses a 40 nm design. AMD has set the core frequency at 650 MHz. The DDR3 RAM is set to run at a frequency of 800 MHz on this model. It features 80(16x5) SPUs along with 8 Texture Address Units and 4 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5450 19 Watts
Radeon HD 4870 512MB 150 Watts
Difference: 131 Watts (689%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4870 512MB is 800% faster than the Radeon HD 5450 overall, because of its higher data rate. (explain)

Radeon HD 4870 512MB 115200 MB/sec
Radeon HD 5450 12800 MB/sec
Difference: 102400 (800%)

Texel Rate

The Radeon HD 4870 512MB should be a lot (approximately 477%) more effective at AF than the Radeon HD 5450. (explain)

Radeon HD 4870 512MB 30000 Mtexels/sec
Radeon HD 5450 5200 Mtexels/sec
Difference: 24800 (477%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 4870 512MB is a better choice, by a large margin. (explain)

Radeon HD 4870 512MB 12000 Mpixels/sec
Radeon HD 5450 2600 Mpixels/sec
Difference: 9400 (362%)

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 4870 512MB

Amazon.com

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Radeon HD 5450

Amazon.com

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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 4870 512MB Radeon HD 5450
Manufacturer AMD AMD
Year Jun 25, 2008 February 4, 2010
Code Name RV770 XT Cedar PRO
Memory 512 MB 512 MB
Core Speed 750 MHz 650 MHz
Memory Speed 3600 MHz 1600 MHz
Power (Max TDP) 150 watts 19 watts
Bandwidth 115200 MB/sec 12800 MB/sec
Texel Rate 30000 Mtexels/sec 5200 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 2600 Mpixels/sec
Unified Shaders 800(160x5) 80(16x5)
Texture Mapping Units 40 8
Render Output Units 16 4
Bus Type GDDR5 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: Bandwidth is the maximum amount of data (counted in megabytes per second) that can be transferred past the external memory interface within a second. It's calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR RAM, it should 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, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines 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 fill rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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Radeon HD 4870 512MB

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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