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GeForce GTX 460 vs Radeon HD 7770

Intro

The GeForce GTX 460 comes with a core clock frequency of 675 MHz and a GDDR5 memory frequency of 900 MHz. It also features a 192-bit memory bus, and makes use of a 40 nm design. It is made up of 336 SPUs, 56 Texture Address Units, and 24 ROPs.

Compare that to the Radeon HD 7770, which features a GPU core clock speed of 1000 MHz, and 1024 MB of GDDR5 memory set to run at 1125 MHz through a 128-bit bus. It also is comprised of 640 SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

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(No game benchmarks for this combination yet.)

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

In theory, the GeForce GTX 460 should be a little bit faster than the Radeon HD 7770 in general. (explain)

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

Texel Rate

The Radeon HD 7770 will be just a bit (approximately 6%) more effective at texture filtering than the GeForce GTX 460. (explain)

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

Pixel Rate

The GeForce GTX 460 should be a small bit (about 1%) more effective at AA than the Radeon HD 7770, and also should be able to handle higher resolutions without losing too much performance. (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
Fab Process 40 nm 28 nm
Bus PCIe x16 PCIe 3.0 x16
Memory 768 MB 1024 MB
Core Speed 675 MHz 1000 MHz
Shader Speed 1350 MHz (N/A) MHz
Memory Speed 900 MHz (3600 MHz effective) 1125 MHz (4500 MHz effective)
Unified Shaders 336 640
Texture Mapping Units 56 40
Render Output Units 24 16
Bus Type GDDR5 GDDR5
Bus Width 192-bit 128-bit
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.2
Power (Max TDP) 150 watts 80 watts
Shader Model 5.0 5.0
Bandwidth 86400 MB/sec 72000 MB/sec
Texel Rate 37800 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 16200 Mpixels/sec 16000 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the largest amount of data (measured in MB per second) that can be transported across the external memory interface in one second. It's worked out by multiplying the bus width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, 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 number of texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, the better the graphics 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 maximum number of pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount 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 filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Comments

One Response to “GeForce GTX 460 vs Radeon HD 7770”
[...] 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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