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Radeon HD 4890 2GB vs Radeon HD 5970

Intro

The Radeon HD 4890 2GB comes with a core clock speed of 1000 MHz and a GDDR5 memory speed of 975 MHz. It also uses a 256-bit bus, and uses a 55 nm design. It is comprised of 800(160x5) SPUs, 40 Texture Address Units, and 16 ROPs.

Compare that to the Radeon HD 5970, which features a clock speed of 725 MHz and a GDDR5 memory speed of 1000 MHz. It also features a 256-bit bus, and makes use of a 40 nm design. It is made up of 1600 SPUs, 160 TAUs, and 64 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4890 2GB 190 Watts
Radeon HD 5970 294 Watts
Difference: 104 Watts (55%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 5970 should perform much faster than the Radeon HD 4890 2GB in general. (explain)

Radeon HD 5970 256000 MB/sec
Radeon HD 4890 2GB 124800 MB/sec
Difference: 131200 (105%)

Texel Rate

The Radeon HD 5970 is much (approximately 480%) faster with regards to AF than the Radeon HD 4890 2GB. (explain)

Radeon HD 5970 232000 Mtexels/sec
Radeon HD 4890 2GB 40000 Mtexels/sec
Difference: 192000 (480%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 5970 is superior to the Radeon HD 4890 2GB, and very much so. (explain)

Radeon HD 5970 92800 Mpixels/sec
Radeon HD 4890 2GB 16000 Mpixels/sec
Difference: 76800 (480%)

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 4890 2GB

Amazon.com

Check prices at:

Radeon HD 5970

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 2GB Radeon HD 5970
Manufacturer AMD AMD
Year Apr 2, 2009 November 2009
Code Name RV790 XT Hemlock XT
Memory 2048 MB 1024 MB (x2)
Core Speed 1000 MHz 725 MHz (x2)
Memory Speed 3900 MHz 4000 MHz (x2)
Power (Max TDP) 190 watts 294 watts
Bandwidth 124800 MB/sec 256000 MB/sec
Texel Rate 40000 Mtexels/sec 232000 Mtexels/sec
Pixel Rate 16000 Mpixels/sec 92800 Mpixels/sec
Unified Shaders 800(160x5) 1600 (x2)
Texture Mapping Units 40 160 (x2)
Render Output Units 16 64 (x2)
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit (x2)
Fab Process 55 nm 40 nm
Transistors 959 million 2154 million
Bus PCIe 2.0 x16 PCIe x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the maximum amount of data (measured in MB per second) that can be moved past the external memory interface in a second. The number is worked out by multiplying the bus width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to its local memory in a 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 of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 4890 2GB

Amazon.com

Check prices at:

Radeon HD 5970

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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