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Radeon HD 4890 1GB vs Radeon R9 M295X

Intro

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

Compare those specs to the Radeon R9 M295X, which comes with GPU core speed of 750 MHz, and 4096 MB of GDDR5 RAM set to run at 1375 MHz through a 256-bit bus. It also features 2048 SPUs, 128 TAUs, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M295X 125 Watts
Radeon HD 4890 1GB 190 Watts
Difference: 65 Watts (52%)

Memory Bandwidth

In theory, the Radeon R9 M295X is 41% faster than the Radeon HD 4890 1GB overall, because of its higher bandwidth. (explain)

Radeon R9 M295X 176000 MB/sec
Radeon HD 4890 1GB 124800 MB/sec
Difference: 51200 (41%)

Texel Rate

The Radeon R9 M295X should be a lot (about 140%) faster with regards to AF than the Radeon HD 4890 1GB. (explain)

Radeon R9 M295X 96000 Mtexels/sec
Radeon HD 4890 1GB 40000 Mtexels/sec
Difference: 56000 (140%)

Pixel Rate

If using a high resolution is important to you, then the Radeon R9 M295X is the winner, and very much so. (explain)

Radeon R9 M295X 24000 Mpixels/sec
Radeon HD 4890 1GB 16000 Mpixels/sec
Difference: 8000 (50%)

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 R9 M295X

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 R9 M295X
Manufacturer AMD AMD
Year Apr 2, 2009 2014
Code Name RV790 XT Unknown
Memory 1024 MB 4096 MB
Core Speed 1000 MHz 750 MHz
Memory Speed 3900 MHz 5500 MHz
Power (Max TDP) 190 watts 125 watts
Bandwidth 124800 MB/sec 176000 MB/sec
Texel Rate 40000 Mtexels/sec 96000 Mtexels/sec
Pixel Rate 16000 Mpixels/sec 24000 Mpixels/sec
Unified Shaders 800(160x5) 2048
Texture Mapping Units 40 128
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 55 nm 28 nm
Transistors 959 million (Unknown) 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: Memory bandwidth is the maximum amount of information (counted in MB per second) that can be transported over the external memory interface in a second. It's worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This is calculated by multiplying the total amount of texture units 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 applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs 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 output rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 4890 1GB

Amazon.com

Check prices at:

Radeon R9 M295X

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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