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Radeon HD 5450 vs Radeon HD 5870

Intro

The Radeon HD 5450 uses a 40 nm design. AMD has set the core speed at 650 MHz. The DDR3 RAM runs at a frequency of 800 MHz on this specific model. It features 80(16x5) SPUs as well as 8 Texture Address Units and 4 Rasterization Operator Units.

Compare those specifications to the Radeon HD 5870, which has core clock speeds of 850 MHz on the GPU, and 1200 MHz on the 1024 MB of GDDR5 RAM. It features 1600(320x5) SPUs as well as 80 TAUs and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5450 19 Watts
Radeon HD 5870 188 Watts
Difference: 169 Watts (889%)

Memory Bandwidth

In theory, the Radeon HD 5870 is 1100% faster than the Radeon HD 5450 overall, because of its higher data rate. (explain)

Radeon HD 5870 153600 MB/sec
Radeon HD 5450 12800 MB/sec
Difference: 140800 (1100%)

Texel Rate

The Radeon HD 5870 is a lot (more or less 1208%) faster with regards to anisotropic filtering than the Radeon HD 5450. (explain)

Radeon HD 5870 68000 Mtexels/sec
Radeon HD 5450 5200 Mtexels/sec
Difference: 62800 (1208%)

Pixel Rate

The Radeon HD 5870 will be quite a bit (more or less 946%) better at FSAA than the Radeon HD 5450, and also should be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon HD 5870 27200 Mpixels/sec
Radeon HD 5450 2600 Mpixels/sec
Difference: 24600 (946%)

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 5450

Amazon.com

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Radeon HD 5870

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 5450 Radeon HD 5870
Manufacturer AMD AMD
Year February 4, 2010 September 23, 2009
Code Name Cedar PRO Cypress XT
Memory 512 MB 1024 MB
Core Speed 650 MHz 850 MHz
Memory Speed 1600 MHz 4800 MHz
Power (Max TDP) 19 watts 188 watts
Bandwidth 12800 MB/sec 153600 MB/sec
Texel Rate 5200 Mtexels/sec 68000 Mtexels/sec
Pixel Rate 2600 Mpixels/sec 27200 Mpixels/sec
Unified Shaders 80(16x5) 1600(320x5)
Texture Mapping Units 8 80
Render Output Units 4 32
Bus Type DDR3 GDDR5
Bus Width 64-bit 256-bit
Fab Process 40 nm 40 nm
Transistors 292 million 2154 million
Bus PCIe 2.1 x16 PCIe 2.1 x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 3.2 OpenGL 3.2

Memory Bandwidth: Bandwidth is the maximum amount of information (in units of megabytes per second) that can be transferred past the external memory interface in a second. It's calculated by multiplying the bus width by its memory speed. In the case of DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's 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 texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total texture units 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 the video card could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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Radeon HD 5450

Amazon.com

Check prices at:

Radeon HD 5870

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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