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Radeon HD 4870 1GB vs Radeon HD 5450

Intro

The Radeon HD 4870 1GB has a GPU core speed of 750 MHz, and the 1024 MB of GDDR5 RAM is set to run at 900 MHz through a 256-bit bus. It also features 800(160x5) SPUs, 40 Texture Address Units, and 16 ROPs.

Compare those specifications to the Radeon HD 5450, which comes with a clock speed of 650 MHz and a DDR3 memory frequency of 800 MHz. It also makes use of a 64-bit memory bus, and makes use of a 40 nm design. It is comprised of 80(16x5) SPUs, 8 Texture Address Units, and 4 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5450 19 Watts
Radeon HD 4870 1GB 150 Watts
Difference: 131 Watts (689%)

Memory Bandwidth

The Radeon HD 4870 1GB should theoretically perform a lot faster than the Radeon HD 5450 in general. (explain)

Radeon HD 4870 1GB 115200 MB/sec
Radeon HD 5450 12800 MB/sec
Difference: 102400 (800%)

Texel Rate

The Radeon HD 4870 1GB is quite a bit (more or less 477%) faster with regards to AF than the Radeon HD 5450. (explain)

Radeon HD 4870 1GB 30000 Mtexels/sec
Radeon HD 5450 5200 Mtexels/sec
Difference: 24800 (477%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 4870 1GB is a better choice, and very much so. (explain)

Radeon HD 4870 1GB 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 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 4870 1GB Radeon HD 5450
Manufacturer AMD AMD
Year Jun 25, 2008 February 4, 2010
Code Name RV770 XT Cedar PRO
Memory 1024 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: Memory bandwidth is the maximum amount of information (in units of MB per second) that can be transferred over the external memory interface in a second. It is worked out by multiplying the bus width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This figure is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the video card will be at 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 the video card could possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many 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 4870 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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