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Radeon HD 7770 vs Radeon R9 270X

Intro

The Radeon HD 7770 features core speeds of 1000 MHz on the GPU, and 1125 MHz on the 1024 MB of GDDR5 memory. It features 640 SPUs as well as 40 Texture Address Units and 16 ROPs.

Compare those specs to the Radeon R9 270X, which has GPU clock speed of 1000 MHz, and 2048 MB of GDDR5 memory set to run at 1400 MHz through a 256-bit bus. It also is comprised of 1280 Stream Processors, 80 TAUs, and 32 Raster Operation Units.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770 80 Watts
Radeon R9 270X 180 Watts
Difference: 100 Watts (125%)

Memory Bandwidth

The Radeon R9 270X, in theory, should perform much faster than the Radeon HD 7770 overall. (explain)

Radeon R9 270X 179200 MB/sec
Radeon HD 7770 72000 MB/sec
Difference: 107200 (149%)

Texel Rate

The Radeon R9 270X will be a lot (approximately 100%) faster with regards to AF than the Radeon HD 7770. (explain)

Radeon R9 270X 80000 Mtexels/sec
Radeon HD 7770 40000 Mtexels/sec
Difference: 40000 (100%)

Pixel Rate

The Radeon R9 270X should be much (more or less 100%) more effective at FSAA than the Radeon HD 7770, and also should be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon R9 270X 32000 Mpixels/sec
Radeon HD 7770 16000 Mpixels/sec
Difference: 16000 (100%)

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 R9 270X

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 R9 270X
Manufacturer AMD AMD
Year February 2012 October 2013
Code Name Cape Verde XT Curacao XT
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 1024 MB 2048 MB
Core Speed 1000 MHz 1000 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 1125 MHz (4500 MHz effective) 1400 MHz (5600 MHz effective)
Unified Shaders 640 1280
Texture Mapping Units 40 80
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
DirectX Version DirectX 11.1 DirectX 11.2
OpenGL Version OpenGL 4.2 OpenGL 4.3
Power (Max TDP) 80 watts 180 watts
Shader Model 5.0 5.0
Bandwidth 72000 MB/sec 179200 MB/sec
Texel Rate 40000 Mtexels/sec 80000 Mtexels/sec
Pixel Rate 16000 Mpixels/sec 32000 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the max amount of data (measured in megabytes per second) that can be transferred over the external memory interface in a second. It's calculated by multiplying the interface width by its memory clock speed. In the case of DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better 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 can be processed per second. This figure is worked out by multiplying the total number of texture units 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 processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

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