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Radeon HD 7870 vs Radeon HD 7950 3GB

Intro

The Radeon HD 7870 features core clock speeds of 1000 MHz on the GPU, and 1200 MHz on the 2048 MB of GDDR5 RAM. It features 1280 SPUs along with 80 Texture Address Units and 32 Rasterization Operator Units.

Compare those specifications to the Radeon HD 7950 3GB, which comes with GPU clock speed of 800 MHz, and 3072 MB of GDDR5 memory set to run at 1250 MHz through a 384-bit bus. It also is made up of 1792 Stream Processors, 112 TAUs, and 32 ROPs.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7870 175 Watts
Radeon HD 7950 3GB 200 Watts
Difference: 25 Watts (14%)

Memory Bandwidth

Performance-wise, the Radeon HD 7950 3GB should in theory be much superior to the Radeon HD 7870 in general. (explain)

Radeon HD 7950 3GB 240000 MB/sec
Radeon HD 7870 153600 MB/sec
Difference: 86400 (56%)

Texel Rate

The Radeon HD 7950 3GB should be a little bit (about 12%) better at texture filtering than the Radeon HD 7870. (explain)

Radeon HD 7950 3GB 89600 Mtexels/sec
Radeon HD 7870 80000 Mtexels/sec
Difference: 9600 (12%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 7870 is a better choice, by far. (explain)

Radeon HD 7870 32000 Mpixels/sec
Radeon HD 7950 3GB 25600 Mpixels/sec
Difference: 6400 (25%)

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 7870

Amazon.com

Radeon HD 7950 3GB

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 7870 Radeon HD 7950 3GB
Manufacturer AMD AMD
Year March 2012 January 2012
Code Name Pitcairn XT Tahiti Pro
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 2048 MB 3072 MB
Core Speed 1000 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 1280 1792
Texture Mapping Units 80 112
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 384-bit
DirectX Version DirectX 11.1 DirectX 11.1
OpenGL Version OpenGL 4.2 OpenGL 4.2
Power (Max TDP) 175 watts 200 watts
Shader Model 5.0 5.0
Bandwidth 153600 MB/sec 240000 MB/sec
Texel Rate 80000 Mtexels/sec 89600 Mtexels/sec
Pixel Rate 32000 Mpixels/sec 25600 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the maximum amount of information (counted in megabytes per second) that can be transferred past the external memory interface in one second. The number is calculated by multiplying the interface width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, 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 number of texture map elements (texels) that are processed in one second. This figure is calculated 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 card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Comments

2 Responses to “Radeon HD 7870 vs Radeon HD 7950 3GB”
[...] be oc'ed around 1100/1600 to get 60 fps (Ultra Settings) in BF3 and your card is < than a 7950 Radeon HD 7870 vs Radeon HD 7950 3GB – Performance Comparison Benchmarks @ Hardware Compare Reply With Quote   « Previous Thread | Next Thread [...]
Peter says:
Alright, so I have a single 1080p display. I want the better video card to max out any games with. I'm not really that interested in AA but I'd sure like to max it out. I'm ready to pay up anything for any build/model of those 2 cards (DD, GHz etc).
Thanks a lot in advance!

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