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Radeon HD 5450 vs Radeon HD 7870

Intro

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

Compare those specs to the Radeon HD 7870, which makes use of a 28 nm design. AMD has clocked the core speed at 1000 MHz. The GDDR5 memory runs at a frequency of 1200 MHz on this card. It features 1280 SPUs along with 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 7870 175 Watts
Difference: 156 Watts (821%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7870 should theoretically be a lot superior to the Radeon HD 5450 in general. (explain)

Radeon HD 7870 153600 MB/sec
Radeon HD 5450 12800 MB/sec
Difference: 140800 (1100%)

Texel Rate

The Radeon HD 7870 will be a lot (more or less 1438%) more effective at AF than the Radeon HD 5450. (explain)

Radeon HD 7870 80000 Mtexels/sec
Radeon HD 5450 5200 Mtexels/sec
Difference: 74800 (1438%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 7870 is a better choice, by a large margin. (explain)

Radeon HD 7870 32000 Mpixels/sec
Radeon HD 5450 2600 Mpixels/sec
Difference: 29400 (1131%)

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

Check prices at:

Radeon HD 7870

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 5450 Radeon HD 7870
Manufacturer AMD AMD
Year February 4, 2010 March 2012
Code Name Cedar PRO Pitcairn XT
Memory 512 MB 2048 MB
Core Speed 650 MHz 1000 MHz
Memory Speed 1600 MHz 4800 MHz
Power (Max TDP) 19 watts 175 watts
Bandwidth 12800 MB/sec 153600 MB/sec
Texel Rate 5200 Mtexels/sec 80000 Mtexels/sec
Pixel Rate 2600 Mpixels/sec 32000 Mpixels/sec
Unified Shaders 80(16x5) 1280
Texture Mapping Units 8 80
Render Output Units 4 32
Bus Type DDR3 GDDR5
Bus Width 64-bit 256-bit
Fab Process 40 nm 28 nm
Transistors 292 million 2800 million
Bus PCIe 2.1 x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 3.2 OpenGL 4.2

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

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the video 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 amount of pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 5450

Amazon.com

Check prices at:

Radeon HD 7870

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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