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

Intro

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

Compare all that to the Radeon HD 6670 (OEM) 1GB, which makes use of a 40 nm design. AMD has set the core speed at 800 MHz. The GDDR5 memory runs at a speed of 1000 MHz on this model. It features 480 SPUs along with 24 Texture Address Units and 8 Rasterization Operator Units.

Display Graphs

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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

As far as performance goes, the Radeon HD 6670 (OEM) 1GB should in theory be a small bit better than 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 will be much (more or less 50%) better at 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 high levels of AA is important to you, then the GeForce GT 640 DDR3 is superior to the Radeon HD 6670 (OEM) 1GB, 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

GeForce GT 640 DDR3

Radeon HD 6670 (OEM) 1GB

Specifications

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: Bandwidth is the maximum amount of data (in units of megabytes per second) that can be transferred past the external memory interface within a second. It is calculated by multiplying the interface width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 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 AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines 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 rate is also dependant 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 maximum fill rate.

GeForce GT 640 DDR3

Radeon HD 6670 (OEM) 1GB

Comments

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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