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Radeon HD 7750 vs Radeon HD 7990

Intro

The Radeon HD 7750 features core speeds of 800 MHz on the GPU, and 1125 MHz on the 1024 MB of GDDR5 memory. It features 512 SPUs as well as 32 TAUs and 16 ROPs.

Compare those specs to the Radeon HD 7990, which uses a 28 nm design. AMD has clocked the core speed at 950 MHz. The GDDR5 RAM runs at a speed of 1500 MHz on this particular model. It features 2048 SPUs along with 128 Texture Address Units and 32 ROPs.

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon HD 7990 15520 points
Radeon HD 7750 2240 points
Difference: 13280 (593%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7750 55 Watts
Radeon HD 7990 375 Watts
Difference: 320 Watts (582%)

Memory Bandwidth

Performance-wise, the Radeon HD 7990 should theoretically be quite a bit better than the Radeon HD 7750 overall. (explain)

Radeon HD 7990 576000 MB/sec
Radeon HD 7750 72000 MB/sec
Difference: 504000 (700%)

Texel Rate

The Radeon HD 7990 should be a lot (approximately 850%) faster with regards to anisotropic filtering than the Radeon HD 7750. (explain)

Radeon HD 7990 243200 Mtexels/sec
Radeon HD 7750 25600 Mtexels/sec
Difference: 217600 (850%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 7990 is superior to the Radeon HD 7750, by a large margin. (explain)

Radeon HD 7990 60800 Mpixels/sec
Radeon HD 7750 12800 Mpixels/sec
Difference: 48000 (375%)

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 7750

Amazon.com

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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 7750 Radeon HD 7990
Manufacturer AMD AMD
Year February 2012 April 2013
Code Name Cape Verde Pro Malta
Memory 1024 MB 3072 MB (x2)
Core Speed 800 MHz 950 MHz (x2)
Memory Speed 4500 MHz 6000 MHz (x2)
Power (Max TDP) 55 watts 375 watts
Bandwidth 72000 MB/sec 576000 MB/sec
Texel Rate 25600 Mtexels/sec 243200 Mtexels/sec
Pixel Rate 12800 Mpixels/sec 60800 Mpixels/sec
Unified Shaders 512 2048 (x2)
Texture Mapping Units 32 128 (x2)
Render Output Units 16 32 (x2)
Bus Type GDDR5 GDDR5
Bus Width 128-bit 384-bit (x2)
Fab Process 28 nm 28 nm
Transistors 1500 million 4313 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 11.1
OpenGL Version OpenGL 4.2 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the max amount of data (measured in megabytes per second) that can be transported past the external memory interface within a second. It's worked out by multiplying the interface width by its memory speed. In the case of DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 number of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total amount of texture units of the card by the core clock 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 per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of 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 fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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Radeon HD 7750

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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