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Radeon HD 5750 1GB vs Radeon HD 6990

Intro

The Radeon HD 5750 1GB has a GPU core clock speed of 700 MHz, and the 1024 MB of GDDR5 memory runs at 1150 MHz through a 128-bit bus. It also is comprised of 720(144x5) Stream Processors, 36 Texture Address Units, and 16 ROPs.

Compare all that to the Radeon HD 6990, which features a core clock speed of 830 MHz and a GDDR5 memory frequency of 1250 MHz. It also makes use of a 256-bit memory bus, and makes use of a 40 nm design. It features 1536 SPUs, 96 TAUs, and 32 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5750 1GB 86 Watts
Radeon HD 6990 375 Watts
Difference: 289 Watts (336%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6990 should be a lot faster than the Radeon HD 5750 1GB in general. (explain)

Radeon HD 6990 320000 MB/sec
Radeon HD 5750 1GB 73600 MB/sec
Difference: 246400 (335%)

Texel Rate

The Radeon HD 6990 is a lot (about 532%) faster with regards to AF than the Radeon HD 5750 1GB. (explain)

Radeon HD 6990 159360 Mtexels/sec
Radeon HD 5750 1GB 25200 Mtexels/sec
Difference: 134160 (532%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 6990 is a better choice, and very much so. (explain)

Radeon HD 6990 53120 Mpixels/sec
Radeon HD 5750 1GB 11200 Mpixels/sec
Difference: 41920 (374%)

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 5750 1GB

Amazon.com

Check prices at:

Radeon HD 6990

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 5750 1GB Radeon HD 6990
Manufacturer AMD AMD
Year October 13, 2009 March 2011
Code Name Juniper LE Antilles
Memory 1024 MB 2048 MB (x2)
Core Speed 700 MHz 830 MHz (x2)
Memory Speed 4600 MHz 5000 MHz (x2)
Power (Max TDP) 86 watts 375 watts
Bandwidth 73600 MB/sec 320000 MB/sec
Texel Rate 25200 Mtexels/sec 159360 Mtexels/sec
Pixel Rate 11200 Mpixels/sec 53120 Mpixels/sec
Unified Shaders 720(144x5) 1536 (x2)
Texture Mapping Units 36 96 (x2)
Render Output Units 16 32 (x2)
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit (x2)
Fab Process 40 nm 40 nm
Transistors 1040 million 2640 million
Bus PCIe 2.1 x16 PCIe 2.1 x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 3.2 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the maximum amount of data (measured in MB per second) that can be transported across the external memory interface in one second. It is calculated by multiplying the bus width by its memory clock speed. In the case of DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many 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

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Radeon HD 5750 1GB

Amazon.com

Check prices at:

Radeon HD 6990

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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