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Radeon HD 7750 vs Radeon HD 7770

Intro

The Radeon HD 7750 features a clock speed of 800 MHz and a GDDR5 memory speed of 1125 MHz. It also uses a 128-bit memory bus, and uses a 28 nm design. It is made up of 512 SPUs, 32 TAUs, and 16 Raster Operation Units.

Compare all that to the Radeon HD 7770, which features a clock speed of 1000 MHz and a GDDR5 memory speed of 1125 MHz. It also uses a 128-bit bus, and makes use of a 28 nm design. It is made up of 640 SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

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(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7750 55 Watts
Radeon HD 7770 80 Watts
Difference: 25 Watts (45%)

Memory Bandwidth

Both cards have the exact same bandwidth, so theoretically they should perform exactly the same. (explain)

Texel Rate

The Radeon HD 7770 should be quite a bit (approximately 56%) better at texture filtering than the Radeon HD 7750. (explain)

Radeon HD 7770 40000 Mtexels/sec
Radeon HD 7750 25600 Mtexels/sec
Difference: 14400 (56%)

Pixel Rate

The Radeon HD 7770 will be a lot (more or less 25%) better at full screen anti-aliasing than the Radeon HD 7750, and also will be able to handle higher screen resolutions better. (explain)

Radeon HD 7770 16000 Mpixels/sec
Radeon HD 7750 12800 Mpixels/sec
Difference: 3200 (25%)

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.

Price Comparison

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Radeon HD 7750

Amazon.com

Radeon HD 7770

Amazon.com

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 7770
Manufacturer AMD AMD
Year February 2012 February 2012
Code Name Cape Verde Pro Cape Verde XT
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 1024 MB 1024 MB
Core Speed 800 MHz 1000 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 4500 MHz 4500 MHz
Unified Shaders 512 640
Texture Mapping Units 32 40
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 128-bit 128-bit
DirectX Version DirectX 11.1 DirectX 11.1
OpenGL Version OpenGL 4.2 OpenGL 4.2
Power (Max TDP) 55 watts 80 watts
Shader Model 5.0 5.0
Bandwidth 72000 MB/sec 72000 MB/sec
Texel Rate 25600 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 12800 Mpixels/sec 16000 Mpixels/sec

Memory Bandwidth: Bandwidth is the maximum amount of information (in units of megabytes per second) that can be moved over the external memory interface in a second. The number is worked out by multiplying the bus width by the speed of its memory. If it uses DDR type RAM, it should be multiplied by 2 once 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 higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can 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 Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Comments

2 Responses to “Radeon HD 7750 vs Radeon HD 7770”
Anonymous says:

Radeon HD 7770 vs Radeon HD 7950 3GB
Radeon HD 7850 →

RST014 says:

Why AMD HD 7770 win by far?

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