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Radeon HD 7770 vs Radeon R7 260X

Intro

The Radeon HD 7770 features a GPU clock speed of 1000 MHz, and the 1024 MB of GDDR5 RAM is set to run at 1125 MHz through a 128-bit bus. It also features 640 Stream Processors, 40 Texture Address Units, and 16 ROPs.

Compare those specs to the Radeon R7 260X, which uses a 28 nm design. ATi has clocked the core speed at 1100 MHz. The GDDR5 RAM runs at a frequency of 1625 MHz on this particular model. 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, 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 will be much (approximately 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 should be a little bit (approximately 10%) faster with regards to anti-aliasing than the Radeon HD 7770, and will be able to handle higher screen resolutions without slowing down too much. (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

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 7770

Amazon.com

Other US-based stores

Radeon R7 260X

Amazon.com

Other US-based stores

Specifications

Model Radeon HD 7770 Radeon R7 260X
Manufacturer ATi ATi
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 largest amount of data (counted in MB per second) that can be moved across the external memory interface in one second. The number is worked out by multiplying the bus width by its memory clock speed. If the card has DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, 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 are processed per second. This is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the 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 number of pixels that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. 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 rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Comments

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

:)

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