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Radeon HD 7870 vs Radeon HD 7950 3GB


Intro

The Radeon HD 7870 comes with a GPU core speed of 1000 MHz, and the 2048 MB of GDDR5 RAM is set to run at 1200 MHz through a 256-bit bus. It also features 1280 Stream Processors, 80 TAUs, and 32 Raster Operation Units.

Compare all that to the Radeon HD 7950 3GB, which features a core clock frequency of 800 MHz and a GDDR5 memory speed of 1250 MHz. It also uses a 384-bit bus, and uses a 28 nm design. It features 1792 SPUs, 112 Texture Address Units, 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.

Zcash Mining Hash Rate

Radeon HD 7950 3GB 229 Sol/s
Radeon HD 7870 172 Sol/s
Difference: 57 (33%)

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

The Radeon HD 7950 3GB should theoretically be much faster than the Radeon HD 7870 overall. (explain)

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

Texel Rate

The Radeon HD 7950 3GB will be a little bit (approximately 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

The Radeon HD 7870 will be a lot (approximately 25%) better at anti-aliasing than the Radeon HD 7950 3GB, and also will be capable of handling higher screen resolutions without slowing down too much. (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

Radeon HD 7950 3GB

Specifications

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Model Radeon HD 7870 Radeon HD 7950 3GB
Manufacturer AMD AMD
Year March 2012 January 2012
Code Name Pitcairn XT Tahiti Pro
Memory 2048 MB 3072 MB
Core Speed 1000 MHz 800 MHz
Memory Speed 4800 MHz 5000 MHz
Power (Max TDP) 175 watts 200 watts
Bandwidth 153600 MB/sec 240000 MB/sec
Texel Rate 80000 Mtexels/sec 89600 Mtexels/sec
Pixel Rate 32000 Mpixels/sec 25600 Mpixels/sec
Unified Shaders 1280 1792
Texture Mapping Units 80 112
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 384-bit
Fab Process 28 nm 28 nm
Transistors 2800 million 4313 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 11.1
OpenGL Version OpenGL 4.2 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the maximum amount of information (in units of megabytes per second) that can be transferred across the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory speed. If the card has DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better 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 are applied in one second. This figure is worked out by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, 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 maximum number of pixels that the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the core 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 rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Radeon HD 7870

Radeon HD 7950 3GB

Comments

2 Responses to “Radeon HD 7870 vs Radeon HD 7950 3GB”
New graphics card on the way! AW HELL YEA says:

[...] 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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