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Radeon HD 7750 vs Radeon HD 7770

Intro

The Radeon HD 7750 uses a 28 nm design. ATi has set the core speed at 800 MHz. The GDDR5 RAM works at a frequency of 1125 MHz on this particular model. It features 512 SPUs as well as 32 Texture Address Units and 16 Rasterization Operator Units.

Compare all of that to the Radeon HD 7770, which features GPU clock speed of 1000 MHz, and 1024 MB of GDDR5 RAM set to run at 1125 MHz through a 128-bit bus. It also is made up of 640 Stream Processors, 40 TAUs, and 16 Raster Operation Units.

(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 in theory they should have the same performance. (explain)

Texel Rate

The Radeon HD 7770 should be a lot (about 56%) faster with regards to anisotropic 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 (about 25%) more effective at full screen anti-aliasing than the Radeon HD 7750, and will be able to handle higher resolutions without slowing down too much. (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

Please note that the price comparisons are based on search keywords, and might not be the exact same card listed on this page. We have no control over the accuracy of their search results.

Radeon HD 7750

Amazon.com

Other US-based stores

Radeon HD 7770

Amazon.com

Other US-based stores

Specifications

Model Radeon HD 7750 Radeon HD 7770
Manufacturer ATi ATi
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 1125 MHz (4500 MHz effective) 1125 MHz (4500 MHz effective)
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 largest amount of data (counted in megabytes per second) that can be moved past the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory speed. If it uses DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range 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 speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called 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 potential to get to the maximum 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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