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Geforce GTX 680 vs Radeon HD 7870

Intro

The Geforce GTX 680 comes with a GPU clock speed of 1006 MHz, and the 2048 MB of GDDR5 memory is set to run at 1502 MHz through a 256-bit bus. It also is made up of 1536 SPUs, 128 TAUs, and 32 ROPs.

Compare those specs to the Radeon HD 7870, which has a GPU core clock speed of 1000 MHz, and 2048 MB of GDDR5 memory set to run at 1200 MHz through a 256-bit bus. It also is made up of 1280 SPUs, 80 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
Geforce GTX 680 195 Watts
Difference: 20 Watts (11%)

Memory Bandwidth

The Geforce GTX 680, in theory, should perform much faster than the Radeon HD 7870 overall. (explain)

Geforce GTX 680 192256 MB/sec
Radeon HD 7870 153600 MB/sec
Difference: 38656 (25%)

Texel Rate

The Geforce GTX 680 is a lot (approximately 61%) better at AF than the Radeon HD 7870. (explain)

Geforce GTX 680 128768 Mtexels/sec
Radeon HD 7870 80000 Mtexels/sec
Difference: 48768 (61%)

Pixel Rate

The Geforce GTX 680 is a bit (approximately 1%) faster with regards to anti-aliasing than the Radeon HD 7870, and also will be able to handle higher screen resolutions without losing too much performance. (explain)

Geforce GTX 680 32192 Mpixels/sec
Radeon HD 7870 32000 Mpixels/sec
Difference: 192 (1%)

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

Geforce GTX 680

Amazon.com

Radeon HD 7870

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 Geforce GTX 680 Radeon HD 7870
Manufacturer nVidia AMD
Year March 2012 March 2012
Code Name GK104 Pitcairn XT
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 2048 MB 2048 MB
Core Speed 1006 MHz 1000 MHz
Shader Speed 1006 MHz (N/A) MHz
Memory Speed 1502 MHz (6008 MHz effective) 1200 MHz (4800 MHz effective)
Unified Shaders 1536 1280
Texture Mapping Units 128 80
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
DirectX Version DirectX 11.0 DirectX 11.1
OpenGL Version OpenGL 4.2 OpenGL 4.2
Power (Max TDP) 195 watts 175 watts
Shader Model 5.0 5.0
Bandwidth 192256 MB/sec 153600 MB/sec
Texel Rate 128768 Mtexels/sec 80000 Mtexels/sec
Pixel Rate 32192 Mpixels/sec 32000 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the maximum amount of data (counted in megabytes per second) that can be moved past the external memory interface within a second. It is worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the graphics 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 maximum amount of pixels that the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Comments

4 Responses to “Geforce GTX 680 vs Radeon HD 7870”
Vlad says:
The 680 is definitely the way to go! Yet its suprisingly cheaper too. Hence why its already sold out and nowhere to be found... Still not that much different in price from the GTX 580. And the 7970 right now is still more expensive. 680 FTW!! :D
Anonymous says:
waho niente male sul pixel addiritura allora la 7970 e piu potente della 7950 ho cosa...
MikEms says:
Thanks to its 1000MHz clock speed, the Radeon HD 7870 has higher pixel fill and rasterization rates than even the Radeon HD 7970. That's because the two cards have the same number of ROPs, and they can both process two triangles per clock, but the 7970 is only clocked at 925MHz. The 7870 does have more modest texture filtering capabilities, though, not to mention substantially lower shader throughput and memory bandwidth. Source : http://techreport.com/articles.x/22573/2
Random guy says:
The 7870 has better price performance
7870 = I found an OC'd version for 178.98 euros on PIXmania (sapphire 2gb)
680 = Is 300 euros on it's cheapest and overclocking is harder and less effective on a 680

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