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GeForce GT 640 DDR3 vs Radeon HD 6770 1GB

Intro

The GeForce GT 640 DDR3 uses a 28 nm design. nVidia has clocked the core speed at 900 MHz. The DDR3 memory is set to run at a speed of 1782 MHz on this specific card. It features 384 SPUs as well as 32 TAUs and 16 ROPs.

Compare all of that to the Radeon HD 6770 1GB, which uses a 40 nm design. AMD has set the core speed at 900 MHz. The GDDR5 RAM runs at a frequency of 1050 MHz on this specific model. It features 800 SPUs along with 40 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3 65 Watts
Radeon HD 6770 1GB 108 Watts
Difference: 43 Watts (66%)

Memory Bandwidth

The Radeon HD 6770 1GB should theoretically perform a small bit faster than the GeForce GT 640 DDR3 overall. (explain)

Radeon HD 6770 1GB 67200 MB/sec
GeForce GT 640 DDR3 57024 MB/sec
Difference: 10176 (18%)

Texel Rate

The Radeon HD 6770 1GB should be a lot (approximately 25%) more effective at texture filtering than the GeForce GT 640 DDR3. (explain)

Radeon HD 6770 1GB 36000 Mtexels/sec
GeForce GT 640 DDR3 28800 Mtexels/sec
Difference: 7200 (25%)

Pixel Rate

Both cards have exactly the same pixel rate, so in theory they should be equally good at at FSAA, and be capable of handling the same screen resolutions. (explain)

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 GT 640 DDR3

Amazon.com

Check prices at:

Radeon HD 6770 1GB

Amazon.com

Check prices at:

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 GT 640 DDR3 Radeon HD 6770 1GB
Manufacturer nVidia AMD
Year June 2012 January 2011
Code Name GK107 Juniper XT
Memory 2048 MB 1024 MB
Core Speed 900 MHz 900 MHz
Memory Speed 3564 MHz 4200 MHz
Power (Max TDP) 65 watts 108 watts
Bandwidth 57024 MB/sec 67200 MB/sec
Texel Rate 28800 Mtexels/sec 36000 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 384 800
Texture Mapping Units 32 40
Render Output Units 16 16
Bus Type DDR3 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 4.2 OpenGL 4.1

Memory Bandwidth: Bandwidth is the maximum amount of information (counted in MB per second) that can be transported over the external memory interface within a second. The number is worked out by multiplying the bus width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the 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 number 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 speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the core 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 many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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GeForce GT 640 DDR3

Amazon.com

Check prices at:

Radeon HD 6770 1GB

Amazon.com

Check prices at:

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.

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