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GeForce GTX 460 vs Radeon HD 7770

Intro

The GeForce GTX 460 features a GPU clock speed of 675 MHz, and the 768 MB of GDDR5 RAM is set to run at 900 MHz through a 192-bit bus. It also is made up of 336 Stream Processors, 56 TAUs, and 24 ROPs.

Compare all of that to the Radeon HD 7770, which comes with clock speeds of 1000 MHz on the GPU, and 1125 MHz on the 1024 MB of GDDR5 memory. It features 640 SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770 80 Watts
GeForce GTX 460 150 Watts
Difference: 70 Watts (88%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 460 is 20% faster than the Radeon HD 7770 overall, because of its higher data rate. (explain)

GeForce GTX 460 86400 MB/sec
Radeon HD 7770 72000 MB/sec
Difference: 14400 (20%)

Texel Rate

The Radeon HD 7770 is a little bit (approximately 6%) more effective at AF than the GeForce GTX 460. (explain)

Radeon HD 7770 40000 Mtexels/sec
GeForce GTX 460 37800 Mtexels/sec
Difference: 2200 (6%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce GTX 460 is the winner, not by a very large margin though. (explain)

GeForce GTX 460 16200 Mpixels/sec
Radeon HD 7770 16000 Mpixels/sec
Difference: 200 (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

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GeForce GTX 460

Amazon.com

Radeon HD 7770

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

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Model GeForce GTX 460 Radeon HD 7770
Manufacturer nVidia AMD
Year July 2010 February 2012
Code Name GF104 Cape Verde XT
Memory 768 MB 1024 MB
Core Speed 675 MHz 1000 MHz
Memory Speed 3600 MHz 4500 MHz
Power (Max TDP) 150 watts 80 watts
Bandwidth 86400 MB/sec 72000 MB/sec
Texel Rate 37800 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 16200 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 336 640
Texture Mapping Units 56 40
Render Output Units 24 16
Bus Type GDDR5 GDDR5
Bus Width 192-bit 128-bit
Fab Process 40 nm 28 nm
Transistors 1950 million 1500 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the max amount of information (in units of MB per second) that can be transported across the external memory interface in a second. The number is worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Comments

One Response to “GeForce GTX 460 vs Radeon HD 7770”
gtx 650 to dominate hd7770 , HD 6850 and gtx460 - Page 2 says:

[...] Without a doubt. hd7770 and gtx460 hmmm........7770 new tech but it does give more fps in bf3 GeForce GTX 460 vs Radeon HD 7770 – Performance Comparison Benchmarks @ Hardware Compare though hwcompare is a bit inaccurate since it doesnot mention how DX9 TO 11 can change performance [...]

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