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

Intro

The GeForce GT 640 DDR3 features a clock frequency of 900 MHz and a DDR3 memory frequency of 1782 MHz. It also uses a 128-bit bus, and makes use of a 28 nm design. It is made up of 384 SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

Compare those specs to the Radeon HD 6670 (OEM) 1GB, which comes with a core clock speed of 800 MHz and a GDDR5 memory speed of 1000 MHz. It also makes use of a 128-bit memory bus, and uses a 40 nm design. It is made up of 480 SPUs, 24 Texture Address Units, and 8 Raster Operation Units.

(No game benchmarks for this combination yet.)

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

Theoretically, the Radeon HD 6670 (OEM) 1GB should be a little bit faster than the GeForce GT 640 DDR3 overall. (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 a lot (about 50%) faster with regards to anisotropic filtering 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 the winner, by a large margin. (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

Amazon.com

Radeon HD 6670 (OEM) 1GB

Amazon.com

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

Model GeForce GT 640 DDR3 Radeon HD 6670 (OEM) 1GB
Manufacturer nVidia AMD
Year June 2012 February 2011
Code Name GK107 Turks
Fab Process 28 nm 40 nm
Bus PCIe 3.0 x16 PCIe 2.1 x16
Memory 2048 MB 1024 MB
Core Speed 900 MHz 800 MHz
Shader Speed 900 MHz (N/A) MHz
Memory Speed 1782 MHz (3564 MHz effective) 1000 MHz (4000 MHz effective)
Unified Shaders 384 480
Texture Mapping Units 32 24
Render Output Units 16 8
Bus Type DDR3 GDDR5
Bus Width 128-bit 128-bit
DirectX Version DirectX 11.0 DirectX 11
OpenGL Version OpenGL 4.2 OpenGL 4.1
Power (Max TDP) 65 watts 63 watts
Shader Model 5.0 5.0
Bandwidth 57024 MB/sec 64000 MB/sec
Texel Rate 28800 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 6400 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the largest amount of data (measured in MB per second) that can be moved across the external memory interface in one second. The number is worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

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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