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Radeon HD 7850 vs Radeon R9 290

Intro

The Radeon HD 7850 comes with clock speeds of 860 MHz on the GPU, and 1200 MHz on the 2048 MB of GDDR5 memory. It features 1024 SPUs along with 64 Texture Address Units and 32 Rasterization Operator Units.

Compare that to the Radeon R9 290, which has GPU clock speed of 800 MHz, and 4096 MB of GDDR5 RAM set to run at 1250 MHz through a 512-bit bus. It also is made up of 2560 SPUs, 160 Texture Address Units, and 64 ROPs.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7850 130 Watts
Radeon R9 290 300 Watts
Difference: 170 Watts (131%)

Memory Bandwidth

Performance-wise, the Radeon R9 290 should theoretically be a lot superior to the Radeon HD 7850 in general. (explain)

Radeon R9 290 320000 MB/sec
Radeon HD 7850 153600 MB/sec
Difference: 166400 (108%)

Texel Rate

The Radeon R9 290 will be quite a bit (more or less 133%) better at AF than the Radeon HD 7850. (explain)

Radeon R9 290 128000 Mtexels/sec
Radeon HD 7850 55040 Mtexels/sec
Difference: 72960 (133%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon R9 290 is superior to the Radeon HD 7850, and very much so. (explain)

Radeon R9 290 51200 Mpixels/sec
Radeon HD 7850 27520 Mpixels/sec
Difference: 23680 (86%)

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 7850

Amazon.com

Radeon R9 290

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 7850 Radeon R9 290
Manufacturer AMD AMD
Year March 2012 November 2013
Code Name Pitcairn Pro Hawaii PRO
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 2048 MB 4096 MB
Core Speed 860 MHz 800 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 1200 MHz (4800 MHz effective) 1250 MHz (5000 MHz effective)
Unified Shaders 1024 2560
Texture Mapping Units 64 160
Render Output Units 32 64
Bus Type GDDR5 GDDR5
Bus Width 256-bit 512-bit
DirectX Version DirectX 11.1 DirectX 11.2
OpenGL Version OpenGL 4.2 OpenGL 4.3
Power (Max TDP) 130 watts 300 watts
Shader Model 5.0 5.0
Bandwidth 153600 MB/sec 320000 MB/sec
Texel Rate 55040 Mtexels/sec 128000 Mtexels/sec
Pixel Rate 27520 Mpixels/sec 51200 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the maximum amount of information (in units of MB per second) that can be transported past the external memory interface in a second. The number is worked out by multiplying the interface width by the speed of its memory. If it uses DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher 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 texture map elements (texels) that can be applied per second. This figure is worked out 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 applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the clock 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 output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

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