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GeForce GTX 660 vs Radeon HD 5770

Intro

The GeForce GTX 660 has clock speeds of 980 MHz on the GPU, and 1502 MHz on the 2048 MB of GDDR5 memory. It features 960 SPUs along with 80 TAUs and 24 Rasterization Operator Units.

Compare all of that to the Radeon HD 5770, which has GPU clock speed of 850 MHz, and 1024 MB of GDDR5 RAM running at 1200 MHz through a 128-bit bus. It also is comprised of 800(160x5) Stream Processors, 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 5770 108 Watts
GeForce GTX 660 140 Watts
Difference: 32 Watts (30%)

Memory Bandwidth

The GeForce GTX 660 should in theory perform a lot faster than the Radeon HD 5770 overall. (explain)

GeForce GTX 660 144192 MB/sec
Radeon HD 5770 76800 MB/sec
Difference: 67392 (88%)

Texel Rate

The GeForce GTX 660 should be a lot (more or less 131%) faster with regards to anisotropic filtering than the Radeon HD 5770. (explain)

GeForce GTX 660 78400 Mtexels/sec
Radeon HD 5770 34000 Mtexels/sec
Difference: 44400 (131%)

Pixel Rate

The GeForce GTX 660 is quite a bit (approximately 73%) more effective at anti-aliasing than the Radeon HD 5770, and will be able to handle higher resolutions more effectively. (explain)

GeForce GTX 660 23520 Mpixels/sec
Radeon HD 5770 13600 Mpixels/sec
Difference: 9920 (73%)

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 660

Amazon.com

Other US-based stores

Radeon HD 5770

Amazon.com

Other US-based stores

Specifications

Model GeForce GTX 660 Radeon HD 5770
Manufacturer nVidia ATi
Year September 2012 October 13, 2009
Code Name GK106 Juniper XT
Fab Process 28 nm 40 nm
Bus PCIe 3.0 x16 PCIe 2.1 x16
Memory 2048 MB 1024 MB
Core Speed 980 MHz 850 MHz
Shader Speed 980 MHz (N/A) MHz
Memory Speed 1502 MHz (6008 MHz effective) 1200 MHz (4800 MHz effective)
Unified Shaders 960 800(160x5)
Texture Mapping Units 80 40
Render Output Units 24 16
Bus Type GDDR5 GDDR5
Bus Width 192-bit 128-bit
DirectX Version DirectX 11.1 DirectX 11
OpenGL Version OpenGL 4.3 OpenGL 3.2
Power (Max TDP) 140 watts 108 watts
Shader Model 5.0 5.0
Bandwidth 144192 MB/sec 76800 MB/sec
Texel Rate 78400 Mtexels/sec 34000 Mtexels/sec
Pixel Rate 23520 Mpixels/sec 13600 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the maximum amount of data (in units of MB per second) that can be transferred across the external memory interface in a second. It's worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the 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 processed in one second. This figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.

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