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Radeon HD 4890 1GB vs Radeon HD 6450 (OEM)

Intro

The Radeon HD 4890 1GB features a GPU clock speed of 1000 MHz, and the 1024 MB of GDDR5 RAM runs at 975 MHz through a 256-bit bus. It also features 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.

Compare those specs to the Radeon HD 6450 (OEM), which features a GPU core clock speed of 625 MHz, and 512 MB of GDDR3 memory running at 800 MHz through a 64-bit bus. It also is made up of 160 Stream Processors, 8 Texture Address Units, and 4 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6450 (OEM) 31 Watts
Radeon HD 4890 1GB 190 Watts
Difference: 159 Watts (513%)

Memory Bandwidth

The Radeon HD 4890 1GB should in theory be a lot faster than the Radeon HD 6450 (OEM) overall. (explain)

Radeon HD 4890 1GB 124800 MB/sec
Radeon HD 6450 (OEM) 12800 MB/sec
Difference: 112000 (875%)

Texel Rate

The Radeon HD 4890 1GB is much (more or less 700%) more effective at AF than the Radeon HD 6450 (OEM). (explain)

Radeon HD 4890 1GB 40000 Mtexels/sec
Radeon HD 6450 (OEM) 5000 Mtexels/sec
Difference: 35000 (700%)

Pixel Rate

The Radeon HD 4890 1GB will be quite a bit (approximately 540%) faster with regards to anti-aliasing than the Radeon HD 6450 (OEM), and also will be able to handle higher screen resolutions more effectively. (explain)

Radeon HD 4890 1GB 16000 Mpixels/sec
Radeon HD 6450 (OEM) 2500 Mpixels/sec
Difference: 13500 (540%)

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 4890 1GB

Amazon.com

Check prices at:

Radeon HD 6450 (OEM)

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 4890 1GB Radeon HD 6450 (OEM)
Manufacturer AMD AMD
Year Apr 2, 2009 February 2011
Code Name RV790 XT Caicos
Memory 1024 MB 512 MB
Core Speed 1000 MHz 625 MHz
Memory Speed 3900 MHz 1600 MHz
Power (Max TDP) 190 watts 31 watts
Bandwidth 124800 MB/sec 12800 MB/sec
Texel Rate 40000 Mtexels/sec 5000 Mtexels/sec
Pixel Rate 16000 Mpixels/sec 2500 Mpixels/sec
Unified Shaders 800(160x5) 160
Texture Mapping Units 40 8
Render Output Units 16 4
Bus Type GDDR5 GDDR3
Bus Width 256-bit 64-bit
Fab Process 55 nm 40 nm
Transistors 959 million 370 million
Bus PCIe 2.0 x16 PCIe 2.1 x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Bandwidth is the max amount of data (in units of megabytes per second) that can be transferred over the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory speed. In the case of DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one 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 in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate 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 filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 4890 1GB

Amazon.com

Check prices at:

Radeon HD 6450 (OEM)

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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