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Radeon HD 7950 vs Radeon R9 280X

Intro

The Radeon HD 7950 makes use of a 28 nm design. AMD has clocked the core frequency at 800 MHz. The GDDR5 RAM runs at a speed of 1250 MHz on this specific model. It features 1792 SPUs along with 112 TAUs and 32 ROPs.

Compare those specifications to the Radeon R9 280X, which features GPU clock speed of 850 MHz, and 3072 MB of GDDR5 memory running at 1500 MHz through a 384-bit bus. It also is made up of 2048 SPUs, 128 TAUs, and 32 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 R9 280X 8886 points
Radeon HD 7950 7731 points
Difference: 1155 (15%)

Zcash Mining Hash Rate

Radeon R9 280X 294 Sol/s
Radeon HD 7950 235 Sol/s
Difference: 59 (25%)

Ethereum Mining Hash Rate

Radeon HD 7950 21 Mh/s
Radeon R9 280X 21 Mh/s
Difference: 0 (0%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7950 200 Watts
Radeon R9 280X 250 Watts
Difference: 50 Watts (25%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 280X should be a little bit faster than the Radeon HD 7950 overall. (explain)

Radeon R9 280X 288000 MB/sec
Radeon HD 7950 240000 MB/sec
Difference: 48000 (20%)

Texel Rate

The Radeon R9 280X is much (more or less 21%) more effective at anisotropic filtering than the Radeon HD 7950. (explain)

Radeon R9 280X 108800 Mtexels/sec
Radeon HD 7950 89600 Mtexels/sec
Difference: 19200 (21%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon R9 280X is the winner, but only just. (explain)

Radeon R9 280X 27200 Mpixels/sec
Radeon HD 7950 25600 Mpixels/sec
Difference: 1600 (6%)

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 7950

Amazon.com

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Radeon R9 280X

Amazon.com

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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 7950 Radeon R9 280X
Manufacturer AMD AMD
Year January 2012 October 2013
Code Name Tahiti Pro Tahiti XTL
Memory 1536 MB 3072 MB
Core Speed 800 MHz 850 MHz
Memory Speed 5000 MHz 6000 MHz
Power (Max TDP) 200 watts 250 watts
Bandwidth 240000 MB/sec 288000 MB/sec
Texel Rate 89600 Mtexels/sec 108800 Mtexels/sec
Pixel Rate 25600 Mpixels/sec 27200 Mpixels/sec
Unified Shaders 1792 2048
Texture Mapping Units 112 128
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 384-bit 384-bit
Fab Process 28 nm 28 nm
Transistors 4313 million 4313 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 11.2
OpenGL Version OpenGL 4.2 OpenGL 4.3

Memory Bandwidth: Bandwidth is the largest amount of information (in units of MB per second) that can be transported across the external memory interface in one second. The number is worked out by multiplying the interface width by its memory speed. If it uses DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the 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 are applied per second. This figure is calculated by multiplying the total texture units by the core speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs 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 fill rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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Radeon HD 7950

Amazon.com

Check prices at:

Radeon R9 280X

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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