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GeForce GTX 460 vs Radeon HD 7770

Intro

The GeForce GTX 460 features a clock speed of 675 MHz and a GDDR5 memory speed of 900 MHz. It also uses a 192-bit memory bus, and uses a 40 nm design. It is comprised of 336 SPUs, 56 Texture Address Units, and 24 Raster Operation Units.

Compare that to the Radeon HD 7770, which makes use of a 28 nm design. AMD has clocked the core frequency at 1000 MHz. The GDDR5 memory runs at a frequency of 1125 MHz on this particular card. It features 640 SPUs along with 40 Texture Address Units and 16 ROPs.

(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

Theoretically speaking, the GeForce GTX 460 should perform a small 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 should be a small 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

The GeForce GTX 460 will be a small bit (more or less 1%) faster with regards to full screen anti-aliasing than the Radeon HD 7770, and will be capable of handling higher resolutions without slowing down too much. (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

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

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: Bandwidth is the largest amount of information (counted in MB per second) that can be transferred over the external memory interface in one second. It's worked out by multiplying the card's bus width by its memory speed. If the card has DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen 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 texture units by the core speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can 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 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 output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to 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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