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Radeon HD 4890 1GB vs Radeon R7 250

Intro

The Radeon HD 4890 1GB makes use of a 55 nm design. AMD has set the core frequency at 1000 MHz. The GDDR5 RAM is set to run at a frequency of 975 MHz on this particular card. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

Compare those specifications to the Radeon R7 250, which uses a 28 nm design. AMD has clocked the core frequency at 1000 MHz. The GDDR5 memory works at a frequency of 1150 MHz on this card. It features 384 SPUs as well as 24 TAUs and 8 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 250 65 Watts
Radeon HD 4890 1GB 190 Watts
Difference: 125 Watts (192%)

Memory Bandwidth

In theory, the Radeon HD 4890 1GB will be 70% faster than the Radeon R7 250 in general, because of its higher data rate. (explain)

Radeon HD 4890 1GB 124800 MB/sec
Radeon R7 250 73600 MB/sec
Difference: 51200 (70%)

Texel Rate

The Radeon HD 4890 1GB should be a lot (about 67%) more effective at AF than the Radeon R7 250. (explain)

Radeon HD 4890 1GB 40000 Mtexels/sec
Radeon R7 250 24000 Mtexels/sec
Difference: 16000 (67%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 4890 1GB is the winner, by a large margin. (explain)

Radeon HD 4890 1GB 16000 Mpixels/sec
Radeon R7 250 8000 Mpixels/sec
Difference: 8000 (100%)

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

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Radeon R7 250

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 4890 1GB Radeon R7 250
Manufacturer AMD AMD
Year Apr 2, 2009 October 2013
Code Name RV790 XT Oland XT
Memory 1024 MB 1024 MB
Core Speed 1000 MHz 1000 MHz
Memory Speed 3900 MHz 4600 MHz
Power (Max TDP) 190 watts 65 watts
Bandwidth 124800 MB/sec 73600 MB/sec
Texel Rate 40000 Mtexels/sec 24000 Mtexels/sec
Pixel Rate 16000 Mpixels/sec 8000 Mpixels/sec
Unified Shaders 800(160x5) 384
Texture Mapping Units 40 24
Render Output Units 16 8
Bus Type GDDR5 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 28 nm
Transistors 959 million 1040 million
Bus PCIe 2.0 x16 PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 11.2
OpenGL Version OpenGL 3.0 OpenGL 4.3

Memory Bandwidth: Bandwidth is the max amount of data (measured in megabytes per second) that can be transferred across the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number 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 graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4890 1GB

Amazon.com

Check prices at:

Radeon R7 250

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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