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Radeon HD 6790 vs Radeon R7 250

Intro

The Radeon HD 6790 comes with a GPU core speed of 840 MHz, and the 1024 MB of GDDR5 RAM runs at 1050 MHz through a 256-bit bus. It also is comprised of 800 Stream Processors, 40 TAUs, and 16 ROPs.

Compare those specifications to the Radeon R7 250, which features a core clock speed of 1000 MHz and a GDDR5 memory speed of 1150 MHz. It also features a 128-bit memory bus, and uses a 28 nm design. It is comprised of 384 SPUs, 24 Texture Address Units, and 8 ROPs.

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon HD 6790 2150 points
Radeon R7 250 1836 points
Difference: 314 (17%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 250 65 Watts
Radeon HD 6790 150 Watts
Difference: 85 Watts (131%)

Memory Bandwidth

In theory, the Radeon HD 6790 should perform quite a bit faster than the Radeon R7 250 overall. (explain)

Radeon HD 6790 134400 MB/sec
Radeon R7 250 73600 MB/sec
Difference: 60800 (83%)

Texel Rate

The Radeon HD 6790 will be quite a bit (about 40%) faster with regards to texture filtering than the Radeon R7 250. (explain)

Radeon HD 6790 33600 Mtexels/sec
Radeon R7 250 24000 Mtexels/sec
Difference: 9600 (40%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 6790 is a better choice, by a large margin. (explain)

Radeon HD 6790 13440 Mpixels/sec
Radeon R7 250 8000 Mpixels/sec
Difference: 5440 (68%)

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

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Radeon HD 6790

Amazon.com

Check prices at:

Radeon R7 250

Amazon.com

Check prices at:

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

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Model Radeon HD 6790 Radeon R7 250
Manufacturer AMD AMD
Year April 2011 October 2013
Code Name Barts LE Oland XT
Memory 1024 MB 1024 MB
Core Speed 840 MHz 1000 MHz
Memory Speed 4200 MHz 4600 MHz
Power (Max TDP) 150 watts 65 watts
Bandwidth 134400 MB/sec 73600 MB/sec
Texel Rate 33600 Mtexels/sec 24000 Mtexels/sec
Pixel Rate 13440 Mpixels/sec 8000 Mpixels/sec
Unified Shaders 800 384
Texture Mapping Units 40 24
Render Output Units 16 8
Bus Type GDDR5 GDDR5
Bus Width 256-bit 128-bit
Fab Process 40 nm 28 nm
Transistors 1700 million 1040 million
Bus PCIe 2.1 x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.2
OpenGL Version OpenGL 4.1 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the max amount of data (measured in megabytes per second) that can be transported past the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster 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 can be processed in one second. This is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the clock 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 output rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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Radeon HD 6790

Amazon.com

Check prices at:

Radeon R7 250

Amazon.com

Check prices at:

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.

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