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Radeon HD 7770 vs Radeon R7 260X

Intro

The Radeon HD 7770 uses a 28 nm design. AMD has set the core frequency at 1000 MHz. The GDDR5 RAM works at a speed of 1125 MHz on this particular card. It features 640 SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Compare that to the Radeon R7 260X, which makes use of a 28 nm design. AMD has clocked the core speed at 1100 MHz. The GDDR5 memory is set to run at a frequency of 1625 MHz on this particular card. It features 896 SPUs along with 56 Texture Address Units and 16 Rasterization Operator Units.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770 80 Watts
Radeon R7 260X 115 Watts
Difference: 35 Watts (44%)

Memory Bandwidth

Theoretically speaking, the Radeon R7 260X should be much faster than the Radeon HD 7770 overall. (explain)

Radeon R7 260X 104000 MB/sec
Radeon HD 7770 72000 MB/sec
Difference: 32000 (44%)

Texel Rate

The Radeon R7 260X should be much (about 54%) better at AF than the Radeon HD 7770. (explain)

Radeon R7 260X 61600 Mtexels/sec
Radeon HD 7770 40000 Mtexels/sec
Difference: 21600 (54%)

Pixel Rate

The Radeon R7 260X is a bit (approximately 10%) better at full screen anti-aliasing than the Radeon HD 7770, and also able to handle higher resolutions better. (explain)

Radeon R7 260X 17600 Mpixels/sec
Radeon HD 7770 16000 Mpixels/sec
Difference: 1600 (10%)

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

Radeon HD 7770

Amazon.com

Radeon R7 260X

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

Model Radeon HD 7770 Radeon R7 260X
Manufacturer AMD AMD
Year February 2012 October 2013
Code Name Cape Verde XT Bonaire XTX
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 1024 MB 2048 MB
Core Speed 1000 MHz 1100 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 1125 MHz (4500 MHz effective) 1625 MHz (6500 MHz effective)
Unified Shaders 640 896
Texture Mapping Units 40 56
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 128-bit 128-bit
DirectX Version DirectX 11.1 DirectX 11.2
OpenGL Version OpenGL 4.2 OpenGL 4.3
Power (Max TDP) 80 watts 115 watts
Shader Model 5.0 5.0
Bandwidth 72000 MB/sec 104000 MB/sec
Texel Rate 40000 Mtexels/sec 61600 Mtexels/sec
Pixel Rate 16000 Mpixels/sec 17600 Mpixels/sec

Memory Bandwidth: Bandwidth is the maximum amount of data (measured in megabytes per second) that can be moved past the external memory interface in one second. The number is calculated by multiplying the bus width by its memory speed. If it uses DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This figure is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the video 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 maximum amount of pixels that the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Comments

2 Responses to “Radeon HD 7770 vs Radeon R7 260X”
robert says:
Radeon R7 260X 1gb
Radeon HD 7770 2gb

:)

Dek says:
^So.....................?

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