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GeForce GT 640 DDR3 vs Radeon HD 6670 (OEM) 1GB


The GeForce GT 640 DDR3 comes with a clock speed of 900 MHz and a DDR3 memory speed of 1782 MHz. It also features a 128-bit memory bus, and makes use of a 28 nm design. It is made up of 384 SPUs, 32 TAUs, and 16 ROPs.

Compare all of that to the Radeon HD 6670 (OEM) 1GB, which features core clock speeds of 800 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 RAM. It features 480 SPUs along with 24 Texture Address Units and 8 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6670 (OEM) 1GB 63 Watts
GeForce GT 640 DDR3 65 Watts
Difference: 2 Watts (3%)

Memory Bandwidth

Performance-wise, the Radeon HD 6670 (OEM) 1GB should in theory be a small bit superior to the GeForce GT 640 DDR3 in general. (explain)

Radeon HD 6670 (OEM) 1GB 64000 MB/sec
GeForce GT 640 DDR3 57024 MB/sec
Difference: 6976 (12%)

Texel Rate

The GeForce GT 640 DDR3 should be much (more or less 50%) faster with regards to AF than the Radeon HD 6670 (OEM) 1GB. (explain)

GeForce GT 640 DDR3 28800 Mtexels/sec
Radeon HD 6670 (OEM) 1GB 19200 Mtexels/sec
Difference: 9600 (50%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce GT 640 DDR3 is a better choice, and very much so. (explain)

GeForce GT 640 DDR3 14400 Mpixels/sec
Radeon HD 6670 (OEM) 1GB 6400 Mpixels/sec
Difference: 8000 (125%)

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

Radeon HD 6670 (OEM) 1GB

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.


Display Specifications

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Model GeForce GT 640 DDR3 Radeon HD 6670 (OEM) 1GB
Manufacturer nVidia AMD
Year June 2012 February 2011
Code Name GK107 Turks
Memory 2048 MB 1024 MB
Core Speed 900 MHz 800 MHz
Memory Speed 3564 MHz 4000 MHz
Power (Max TDP) 65 watts 63 watts
Bandwidth 57024 MB/sec 64000 MB/sec
Texel Rate 28800 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 6400 Mpixels/sec
Unified Shaders 384 480
Texture Mapping Units 32 24
Render Output Units 16 8
Bus Type DDR3 GDDR5
Bus Width 128-bit 128-bit
Fab Process 28 nm 40 nm
Transistors 1300 million 715 million
Bus PCIe 3.0 x16 PCIe 2.1 x16
DirectX Version DirectX 11.0 DirectX 11
OpenGL Version OpenGL 4.2 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the largest amount of data (counted in megabytes per second) that can be transported across the external memory interface within a second. It is worked out by multiplying the interface width by its memory speed. If the card has DDR memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher 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 applied in one second. This figure is worked out by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the video 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 amount of pixels the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.


2 Responses to “GeForce GT 640 DDR3 vs Radeon HD 6670 (OEM) 1GB”
naon says:

Is the memory for GT 640 as 1782MHz correct? I think the base memory speed is 891Mhz and the effective memory speed is 1782.

majid says:

well despite these results hd6670 performs well over all in games etc

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