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

Intro

The GeForce GT 640 DDR3 features a GPU core clock speed of 900 MHz, and the 2048 MB of DDR3 RAM runs at 1782 MHz through a 128-bit bus. It also features 384 Stream Processors, 32 TAUs, and 16 Raster Operation Units.

Compare all of that to the Radeon HD 6670 (OEM) 1GB, which features a clock speed of 800 MHz and a GDDR5 memory frequency 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 TAUs, and 8 ROPs.

(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 speaking, the Radeon HD 6670 (OEM) 1GB should perform a small bit faster 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 a lot (approximately 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

The GeForce GT 640 DDR3 will be quite a bit (approximately 125%) better at anti-aliasing than the Radeon HD 6670 (OEM) 1GB, and also able to handle higher screen resolutions better. (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

Please note that the price comparisons are based on search keywords, and might not be the exact same card listed on this page. We have no control over the accuracy of their search results.

GeForce GT 640 DDR3

Amazon.com

Other US-based stores

Radeon HD 6670 (OEM) 1GB

Amazon.com

Other US-based stores

Specifications

Model GeForce GT 640 DDR3 Radeon HD 6670 (OEM) 1GB
Manufacturer nVidia ATi
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 11.1 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: Bandwidth is the largest amount of data (measured in megabytes per second) that can be transferred over the external memory interface within a second. It is calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. 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 texture map elements (texels) that are applied per second. This 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 graphics 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 the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out 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 outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential 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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