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Radeon HD 4850 X2 512MB vs Radeon HD 4890 2GB

Intro

The Radeon HD 4850 X2 512MB makes use of a 55 nm design. AMD has clocked the core frequency at 625 MHz. The GDDR3 memory runs at a speed of 993 MHz on this specific model. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

Compare those specifications to the Radeon HD 4890 2GB, which comes with core speeds of 1000 MHz on the GPU, and 975 MHz on the 2048 MB of GDDR5 RAM. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4890 2GB 190 Watts
Radeon HD 4850 X2 512MB 250 Watts
Difference: 60 Watts (32%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4850 X2 512MB should be just a bit faster than the Radeon HD 4890 2GB in general. (explain)

Radeon HD 4850 X2 512MB 127104 MB/sec
Radeon HD 4890 2GB 124800 MB/sec
Difference: 2304 (2%)

Texel Rate

The Radeon HD 4850 X2 512MB should be a lot (approximately 25%) faster with regards to anisotropic filtering than the Radeon HD 4890 2GB. (explain)

Radeon HD 4850 X2 512MB 50000 Mtexels/sec
Radeon HD 4890 2GB 40000 Mtexels/sec
Difference: 10000 (25%)

Pixel Rate

The Radeon HD 4850 X2 512MB is quite a bit (approximately 25%) more effective at full screen anti-aliasing than the Radeon HD 4890 2GB, and also capable of handling higher resolutions better. (explain)

Radeon HD 4850 X2 512MB 20000 Mpixels/sec
Radeon HD 4890 2GB 16000 Mpixels/sec
Difference: 4000 (25%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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Radeon HD 4850 X2 512MB

Amazon.com

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Radeon HD 4890 2GB

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 4850 X2 512MB Radeon HD 4890 2GB
Manufacturer AMD AMD
Year Nov 7, 2008 Apr 2, 2009
Code Name R700 RV790 XT
Memory 512 MB (x2) 2048 MB
Core Speed 625 MHz (x2) 1000 MHz
Memory Speed 1986 MHz (x2) 3900 MHz
Power (Max TDP) 250 watts 190 watts
Bandwidth 127104 MB/sec 124800 MB/sec
Texel Rate 50000 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 20000 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 800(160x5) (x2) 800(160x5)
Texture Mapping Units 40 (x2) 40
Render Output Units 16 (x2) 16
Bus Type GDDR3 GDDR5
Bus Width 256-bit (x2) 256-bit
Fab Process 55 nm 55 nm
Transistors 956 million 959 million
Bus PCIe 2.0 x16 (PCIe bridge) PCIe 2.0 x16
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Bandwidth is the maximum amount of information (in units of megabytes per second) that can be transported over the external memory interface in a second. It's calculated by multiplying the interface width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total number of texture units by the core speed of the chip. The better 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 a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as 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, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 4850 X2 512MB

Amazon.com

Check prices at:

Radeon HD 4890 2GB

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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