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Radeon HD 4770 vs Radeon HD 7990

Intro

The Radeon HD 4770 features a core clock frequency of 750 MHz and a GDDR5 memory frequency of 800 MHz. It also uses a 128-bit bus, and makes use of a 40 nm design. It features 640(128x5) SPUs, 32 Texture Address Units, and 16 ROPs.

Compare those specs to the Radeon HD 7990, which makes use of a 28 nm design. AMD has set the core frequency at 950 MHz. The GDDR5 memory runs at a frequency of 1500 MHz on this model. It features 2048 SPUs as well as 128 Texture Address Units and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770 80 Watts
Radeon HD 7990 375 Watts
Difference: 295 Watts (369%)

Memory Bandwidth

In theory, the Radeon HD 7990 should perform much faster than the Radeon HD 4770 in general. (explain)

Radeon HD 7990 576000 MB/sec
Radeon HD 4770 51200 MB/sec
Difference: 524800 (1025%)

Texel Rate

The Radeon HD 7990 is quite a bit (approximately 913%) better at AF than the Radeon HD 4770. (explain)

Radeon HD 7990 243200 Mtexels/sec
Radeon HD 4770 24000 Mtexels/sec
Difference: 219200 (913%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 7990 is the winner, by far. (explain)

Radeon HD 7990 60800 Mpixels/sec
Radeon HD 4770 12000 Mpixels/sec
Difference: 48800 (407%)

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 4770

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 4770 Radeon HD 7990
Manufacturer AMD AMD
Year Apr 28, 2009 April 2013
Code Name RV740 Malta
Memory 512 MB 3072 MB (x2)
Core Speed 750 MHz 950 MHz (x2)
Memory Speed 3200 MHz 6000 MHz (x2)
Power (Max TDP) 80 watts 375 watts
Bandwidth 51200 MB/sec 576000 MB/sec
Texel Rate 24000 Mtexels/sec 243200 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 60800 Mpixels/sec
Unified Shaders 640(128x5) 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 40 nm 28 nm
Transistors 826 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 maximum amount of information (in units of MB per second) that can be transported over the external memory interface within a second. It is worked out by multiplying the bus width by its memory speed. In the case of DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher 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 maximum number of pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4770

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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