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Radeon HD 4890 1GB vs Radeon R7 250

Intro

The Radeon HD 4890 1GB comes with core speeds of 1000 MHz on the GPU, and 975 MHz on the 1024 MB of GDDR5 memory. It features 800(160x5) SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Compare those specs to the Radeon R7 250, which comes with a core clock speed of 1000 MHz and a GDDR5 memory speed of 1150 MHz. It also features a 128-bit memory bus, and uses a 28 nm design. It is made up of 384 SPUs, 24 Texture Address Units, and 8 ROPs.

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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

Theoretically speaking, the Radeon HD 4890 1GB is 70% faster than the Radeon R7 250 in general, because of its higher bandwidth. (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%) faster with regards to texture filtering than the Radeon R7 250. (explain)

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

Pixel Rate

The Radeon HD 4890 1GB will be much (more or less 100%) faster with regards to anti-aliasing than the Radeon R7 250, and capable of handling higher screen resolutions without losing too much performance. (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

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 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 largest amount of data (counted in megabytes per second) that can be transferred across the external memory interface within a second. It is worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen 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 texture units of the card by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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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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