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Radeon HD 5550 vs Radeon HD 7990

Intro

The Radeon HD 5550 has clock speeds of 550 MHz on the GPU, and 400 MHz on the 512 MB of DDR2 memory. It features 320(64x5) SPUs along with 16 TAUs and 8 ROPs.

Compare all that to the Radeon HD 7990, which has GPU core speed of 950 MHz, and 3072 MB of GDDR5 memory running at 1500 MHz through a 384-bit bus. It also features 2048 Stream Processors, 128 TAUs, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon HD 7990 should in theory be a lot superior to the Radeon HD 5550 overall. (explain)

Radeon HD 7990 576000 MB/sec
Radeon HD 5550 12800 MB/sec
Difference: 563200 (4400%)

Texel Rate

The Radeon HD 7990 should be quite a bit (approximately 2664%) faster with regards to anisotropic filtering than the Radeon HD 5550. (explain)

Radeon HD 7990 243200 Mtexels/sec
Radeon HD 5550 8800 Mtexels/sec
Difference: 234400 (2664%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 7990 is a better choice, by far. (explain)

Radeon HD 7990 60800 Mpixels/sec
Radeon HD 5550 4400 Mpixels/sec
Difference: 56400 (1282%)

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 5550

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 5550 Radeon HD 7990
Manufacturer AMD AMD
Year February 9, 2010 April 2013
Code Name Redwood LE Malta
Memory 512 MB 3072 MB (x2)
Core Speed 550 MHz 950 MHz (x2)
Memory Speed 800 MHz 6000 MHz (x2)
Power (Max TDP) (Unknown) watts 375 watts
Bandwidth 12800 MB/sec 576000 MB/sec
Texel Rate 8800 Mtexels/sec 243200 Mtexels/sec
Pixel Rate 4400 Mpixels/sec 60800 Mpixels/sec
Unified Shaders 320(64x5) 2048 (x2)
Texture Mapping Units 16 128 (x2)
Render Output Units 8 32 (x2)
Bus Type DDR2 GDDR5
Bus Width 128-bit 384-bit (x2)
Fab Process 40 nm 28 nm
Transistors 627 million 4313 million
Bus PCIe 2.1 x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 3.2 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the largest amount of data (in units of megabytes per second) that can be moved over the external memory interface in one second. It is worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the core clock speed. 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 many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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Radeon HD 5550

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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