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Radeon HD 7770 vs Radeon R7 260X

Intro

The Radeon HD 7770 has a clock speed of 1000 MHz and a GDDR5 memory speed of 1125 MHz. It also makes use of a 128-bit memory bus, and uses a 28 nm design. It features 640 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Compare those specifications to the Radeon R7 260X, which has GPU core speed of 1100 MHz, and 2048 MB of GDDR5 memory set to run at 1625 MHz through a 128-bit bus. It also is comprised of 896 Stream Processors, 56 Texture Address Units, and 16 ROPs.

(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

As far as performance goes, the Radeon R7 260X should in theory be quite a bit better 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 a lot (approximately 54%) more effective at anisotropic filtering 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 small bit (about 10%) more effective at FSAA than the Radeon HD 7770, and also 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

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: Memory bandwidth is the largest amount of information (counted in megabytes per second) that can be transported over the external memory interface within a second. It's calculated by multiplying the bus width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This figure is calculated by multiplying the total texture units of the card by the core clock 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 processed in a second.

Pixel Rate: Pixel rate is the most pixels that 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 amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill 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 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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