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Radeon HD 5870 vs Radeon HD 7950

Intro

The Radeon HD 5870 comes with a core clock speed of 850 MHz and a GDDR5 memory frequency of 1200 MHz. It also uses a 256-bit memory bus, and makes use of a 40 nm design. It features 1600(320x5) SPUs, 80 Texture Address Units, and 32 Raster Operation Units.

Compare those specifications to the Radeon HD 7950, which has a core clock frequency of 800 MHz and a GDDR5 memory frequency of 1250 MHz. It also features a 384-bit memory bus, and uses a 28 nm design. It features 1792 SPUs, 112 TAUs, and 32 Raster Operation Units.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5870 188 Watts
Radeon HD 7950 200 Watts
Difference: 12 Watts (6%)

Memory Bandwidth

The Radeon HD 7950, in theory, should perform much faster than the Radeon HD 5870 in general. (explain)

Radeon HD 7950 240000 MB/sec
Radeon HD 5870 153600 MB/sec
Difference: 86400 (56%)

Texel Rate

The Radeon HD 7950 will be a lot (about 32%) faster with regards to AF than the Radeon HD 5870. (explain)

Radeon HD 7950 89600 Mtexels/sec
Radeon HD 5870 68000 Mtexels/sec
Difference: 21600 (32%)

Pixel Rate

The Radeon HD 5870 is a small bit (approximately 6%) better at AA than the Radeon HD 7950, and also capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 5870 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

Radeon HD 5870

Amazon.com

Radeon HD 7950

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 5870 Radeon HD 7950
Manufacturer AMD AMD
Year September 23, 2009 January 2012
Code Name Cypress XT Tahiti Pro
Fab Process 40 nm 28 nm
Bus PCIe 2.1 x16 PCIe 3.0 x16
Memory 1024 MB 1536 MB
Core Speed 850 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 1600(320x5) 1792
Texture Mapping Units 80 112
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 384-bit
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 3.2 OpenGL 4.2
Power (Max TDP) 188 watts 200 watts
Shader Model 5.0 5.0
Bandwidth 153600 MB/sec 240000 MB/sec
Texel Rate 68000 Mtexels/sec 89600 Mtexels/sec
Pixel Rate 27200 Mpixels/sec 25600 Mpixels/sec

Memory Bandwidth: Bandwidth is the max amount of data (measured in MB per second) that can be transferred past the external memory interface in one second. It's worked out by multiplying the interface width by the speed of its memory. If the card has DDR memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Comments

One Response to “Radeon HD 5870 vs Radeon HD 7950”
Anonymous says:
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