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Radeon HD 7770 vs Radeon R7 250

Intro

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

Compare those specifications to the Radeon R7 250, which comes with GPU clock speed of 1000 MHz, and 1024 MB of GDDR5 memory set to run at 1150 MHz through a 128-bit bus. It also features 384 Stream Processors, 24 Texture Address Units, and 8 ROPs.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 250 65 Watts
Radeon HD 7770 80 Watts
Difference: 15 Watts (23%)

Memory Bandwidth

Theoretically, the Radeon R7 250 should be a little bit faster than the Radeon HD 7770 overall. (explain)

Radeon R7 250 73600 MB/sec
Radeon HD 7770 72000 MB/sec
Difference: 1600 (2%)

Texel Rate

The Radeon HD 7770 is much (more or less 67%) more effective at texture filtering than the Radeon R7 250. (explain)

Radeon HD 7770 40000 Mtexels/sec
Radeon R7 250 24000 Mtexels/sec
Difference: 16000 (67%)

Pixel Rate

The Radeon HD 7770 is a lot (more or less 100%) better at full screen anti-aliasing than the Radeon R7 250, and also should be capable of handling higher screen resolutions better. (explain)

Radeon HD 7770 16000 Mpixels/sec
Radeon R7 250 8000 Mpixels/sec
Difference: 8000 (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 R7 250

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 250
Manufacturer AMD AMD
Year February 2012 October 2013
Code Name Cape Verde XT Oland XT
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 1024 MB 1024 MB
Core Speed 1000 MHz 1000 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 1125 MHz (4500 MHz effective) 1150 MHz (4600 MHz effective)
Unified Shaders 640 384
Texture Mapping Units 40 24
Render Output Units 16 8
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 65 watts
Shader Model 5.0 5.0
Bandwidth 72000 MB/sec 73600 MB/sec
Texel Rate 40000 Mtexels/sec 24000 Mtexels/sec
Pixel Rate 16000 Mpixels/sec 8000 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the maximum amount of information (in units of megabytes per second) that can be moved across the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory speed. In the case of DDR RAM, it must 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 anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total amount 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 amount of pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. 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 lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

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