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Radeon HD 4890 2GB vs Radeon HD 7990

Intro

The Radeon HD 4890 2GB uses a 55 nm design. AMD has set the core frequency at 1000 MHz. The GDDR5 RAM runs at a speed of 975 MHz on this model. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 ROPs.

Compare that to the Radeon HD 7990, which comes with a clock speed of 950 MHz and a GDDR5 memory speed of 1500 MHz. It also makes use of a 384-bit memory bus, and uses a 28 nm design. It is comprised of 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4890 2GB 190 Watts
Radeon HD 7990 375 Watts
Difference: 185 Watts (97%)

Memory Bandwidth

In theory, the Radeon HD 7990 should be a lot faster than the Radeon HD 4890 2GB overall. (explain)

Radeon HD 7990 576000 MB/sec
Radeon HD 4890 2GB 124800 MB/sec
Difference: 451200 (362%)

Texel Rate

The Radeon HD 7990 should be a lot (approximately 508%) more effective at texture filtering than the Radeon HD 4890 2GB. (explain)

Radeon HD 7990 243200 Mtexels/sec
Radeon HD 4890 2GB 40000 Mtexels/sec
Difference: 203200 (508%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 7990 is the winner, by far. (explain)

Radeon HD 7990 60800 Mpixels/sec
Radeon HD 4890 2GB 16000 Mpixels/sec
Difference: 44800 (280%)

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 7990

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 7990
Manufacturer AMD AMD
Year Apr 2, 2009 April 2013
Code Name RV790 XT Malta
Memory 2048 MB 3072 MB (x2)
Core Speed 1000 MHz 950 MHz (x2)
Memory Speed 3900 MHz 6000 MHz (x2)
Power (Max TDP) 190 watts 375 watts
Bandwidth 124800 MB/sec 576000 MB/sec
Texel Rate 40000 Mtexels/sec 243200 Mtexels/sec
Pixel Rate 16000 Mpixels/sec 60800 Mpixels/sec
Unified Shaders 800(160x5) 2048 (x2)
Texture Mapping Units 40 128 (x2)
Render Output Units 16 32 (x2)
Bus Type GDDR5 GDDR5
Bus Width 256-bit 384-bit (x2)
Fab Process 55 nm 28 nm
Transistors 959 million 4313 million
Bus PCIe 2.0 x16 PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the max amount of data (measured in megabytes per second) that can be transported across the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory speed. If the card has DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly record 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 the core clock speed. 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 fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4890 2GB

Amazon.com

Check prices at:

Radeon HD 7990

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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