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GeForce GTX 650 vs Radeon HD 6770 1GB

Intro

The GeForce GTX 650 features a clock speed of 1058 MHz and a GDDR5 memory speed of 1250 MHz. It also features a 128-bit bus, and makes use of a 28 nm design. It features 384 SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

Compare that to the Radeon HD 6770 1GB, which has clock speeds of 900 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 memory. It features 800 SPUs as well as 40 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650 64 Watts
Radeon HD 6770 1GB 108 Watts
Difference: 44 Watts (69%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 650 is 19% quicker than the Radeon HD 6770 1GB overall, due to its higher bandwidth. (explain)

GeForce GTX 650 80000 MB/sec
Radeon HD 6770 1GB 67200 MB/sec
Difference: 12800 (19%)

Texel Rate

The Radeon HD 6770 1GB is a small bit (more or less 6%) better at anisotropic filtering than the GeForce GTX 650. (explain)

Radeon HD 6770 1GB 36000 Mtexels/sec
GeForce GTX 650 33856 Mtexels/sec
Difference: 2144 (6%)

Pixel Rate

The GeForce GTX 650 will be a bit (approximately 18%) faster with regards to FSAA than the Radeon HD 6770 1GB, and will be able to handle higher resolutions better. (explain)

GeForce GTX 650 16928 Mpixels/sec
Radeon HD 6770 1GB 14400 Mpixels/sec
Difference: 2528 (18%)

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 650

Radeon HD 6770 1GB

Specifications

Display Specifications

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Model GeForce GTX 650 Radeon HD 6770 1GB
Manufacturer nVidia AMD
Year September 2012 January 2011
Code Name GK107 Juniper XT
Memory 1024 MB 1024 MB
Core Speed 1058 MHz 900 MHz
Memory Speed 5000 MHz 4200 MHz
Power (Max TDP) 64 watts 108 watts
Bandwidth 80000 MB/sec 67200 MB/sec
Texel Rate 33856 Mtexels/sec 36000 Mtexels/sec
Pixel Rate 16928 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 384 800
Texture Mapping Units 32 40
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 128-bit 128-bit
Fab Process 28 nm 40 nm
Transistors 1300 million 1040 million
Bus PCIe 3.0 x16 PCIe x16
DirectX Version DirectX 11.0 DirectX 11
OpenGL Version OpenGL 4.3 OpenGL 4.1

Memory Bandwidth: Bandwidth is the maximum amount of data (in units of MB per second) that can be transported over the external memory interface within a second. The number is calculated by multiplying the bus width by the speed of its memory. If it uses DDR RAM, it must be multiplied by 2 once again. If 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 number of texture map elements (texels) that are applied in one second. This number is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The higher this number, the better the video 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 maximum amount of pixels that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

GeForce GTX 650

Radeon HD 6770 1GB

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