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GeForce GTX 580 vs Radeon HD 7850

Intro

The GeForce GTX 580 comes with a clock speed of 772 MHz and a GDDR5 memory frequency of 1002 MHz. It also makes use of a 384-bit memory bus, and uses a 40 nm design. It is comprised of 512 SPUs, 64 TAUs, and 48 ROPs.

Compare those specifications to the Radeon HD 7850, which uses a 28 nm design. ATi has clocked the core frequency at 860 MHz. The GDDR5 memory runs at a speed of 1200 MHz on this particular model. It features 1024 SPUs as well as 64 Texture Address Units and 32 ROPs.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7850 130 Watts
GeForce GTX 580 244 Watts
Difference: 114 Watts (88%)

Memory Bandwidth

In theory, the GeForce GTX 580 should be 25% quicker than the Radeon HD 7850 in general, because of its greater data rate. (explain)

GeForce GTX 580 192384 MB/sec
Radeon HD 7850 153600 MB/sec
Difference: 38784 (25%)

Texel Rate

The Radeon HD 7850 is a little bit (about 11%) better at AF than the GeForce GTX 580. (explain)

Radeon HD 7850 55040 Mtexels/sec
GeForce GTX 580 49408 Mtexels/sec
Difference: 5632 (11%)

Pixel Rate

The GeForce GTX 580 is quite a bit (approximately 35%) faster with regards to full screen anti-aliasing than the Radeon HD 7850, and should be able to handle higher screen resolutions while still performing well. (explain)

GeForce GTX 580 37056 Mpixels/sec
Radeon HD 7850 27520 Mpixels/sec
Difference: 9536 (35%)

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

Please note that the price comparisons are based on search keywords, and might not be the exact same card listed on this page. We have no control over the accuracy of their search results.

GeForce GTX 580

Amazon.com

Other US-based stores

Radeon HD 7850

Amazon.com

Other US-based stores

Specifications

Model GeForce GTX 580 Radeon HD 7850
Manufacturer nVidia ATi
Year November 2010 March 2012
Code Name GF110 Pitcairn Pro
Fab Process 40 nm 28 nm
Bus PCIe x16 PCIe 3.0 x16
Memory 1536 MB 2048 MB
Core Speed 772 MHz 860 MHz
Shader Speed 1544 MHz (N/A) MHz
Memory Speed 1002 MHz (4008 MHz effective) 1200 MHz (4800 MHz effective)
Unified Shaders 512 1024
Texture Mapping Units 64 64
Render Output Units 48 32
Bus Type GDDR5 GDDR5
Bus Width 384-bit 256-bit
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.2
Power (Max TDP) 244 watts 130 watts
Shader Model 5.0 5.0
Bandwidth 192384 MB/sec 153600 MB/sec
Texel Rate 49408 Mtexels/sec 55040 Mtexels/sec
Pixel Rate 37056 Mpixels/sec 27520 Mpixels/sec

Memory Bandwidth: Bandwidth is the largest amount of data (in units of megabytes per second) that can be transferred across the external memory interface in one second. The number is calculated by multiplying the interface width by its memory speed. If it uses DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, 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 per second. This is worked out by multiplying the total texture units by the core speed of the chip. The better this number, 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 most pixels that the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill 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 reach the maximum fill rate.

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