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Radeon HD 4850 X2 1GB vs Radeon HD 4890 2GB

Intro

The Radeon HD 4850 X2 1GB makes use of a 55 nm design. AMD has clocked the core speed at 625 MHz. The GDDR3 memory runs at a speed of 993 MHz on this card. It features 800(160x5) SPUs along with 40 TAUs and 16 ROPs.

Compare those specifications to the Radeon HD 4890 2GB, which uses a 55 nm design. AMD has clocked the core speed at 1000 MHz. The GDDR5 RAM runs at a frequency of 975 MHz on this specific card. It features 800(160x5) SPUs along with 40 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4890 2GB 190 Watts
Radeon HD 4850 X2 1GB 250 Watts
Difference: 60 Watts (32%)

Memory Bandwidth

Performance-wise, the Radeon HD 4850 X2 1GB should in theory be a bit better than the Radeon HD 4890 2GB overall. (explain)

Radeon HD 4850 X2 1GB 127104 MB/sec
Radeon HD 4890 2GB 124800 MB/sec
Difference: 2304 (2%)

Texel Rate

The Radeon HD 4850 X2 1GB is much (approximately 25%) more effective at AF than the Radeon HD 4890 2GB. (explain)

Radeon HD 4850 X2 1GB 50000 Mtexels/sec
Radeon HD 4890 2GB 40000 Mtexels/sec
Difference: 10000 (25%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 4850 X2 1GB is the winner, by a large margin. (explain)

Radeon HD 4850 X2 1GB 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 1GB

Amazon.com

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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.

Specifications

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Model Radeon HD 4850 X2 1GB Radeon HD 4890 2GB
Manufacturer AMD AMD
Year Nov 7, 2008 Apr 2, 2009
Code Name R700 RV790 XT
Memory 1024 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 MB per second) that can be transported across the external memory interface within a second. It is worked out by multiplying the interface width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the 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 number of texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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Radeon HD 4850 X2 1GB

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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