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GeForce GT 640 DDR3 vs Radeon HD 3870 1GB

Intro

The GeForce GT 640 DDR3 uses a 28 nm design. nVidia has clocked the core speed at 900 MHz. The DDR3 memory works at a frequency of 1782 MHz on this specific card. It features 384 SPUs as well as 32 Texture Address Units and 16 ROPs.

Compare those specs to the Radeon HD 3870 1GB, which features a GPU core clock speed of 775 MHz, and 1024 MB of GDDR4 RAM running at 1125 MHz through a 256-bit bus. It also is made up of 320(64x5) Stream Processors, 16 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3 65 Watts
Radeon HD 3870 1GB 106 Watts
Difference: 41 Watts (63%)

Memory Bandwidth

Theoretically, the Radeon HD 3870 1GB should perform much faster than the GeForce GT 640 DDR3 overall. (explain)

Radeon HD 3870 1GB 72000 MB/sec
GeForce GT 640 DDR3 57024 MB/sec
Difference: 14976 (26%)

Texel Rate

The GeForce GT 640 DDR3 should be quite a bit (about 132%) more effective at AF than the Radeon HD 3870 1GB. (explain)

GeForce GT 640 DDR3 28800 Mtexels/sec
Radeon HD 3870 1GB 12400 Mtexels/sec
Difference: 16400 (132%)

Pixel Rate

The GeForce GT 640 DDR3 is just a bit (about 16%) faster with regards to anti-aliasing than the Radeon HD 3870 1GB, and also will be capable of handling higher screen resolutions while still performing well. (explain)

GeForce GT 640 DDR3 14400 Mpixels/sec
Radeon HD 3870 1GB 12400 Mpixels/sec
Difference: 2000 (16%)

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 3870 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 3870 1GB
Manufacturer nVidia AMD
Year June 2012 Nov 19, 2007
Code Name GK107 RV670 XT
Memory 2048 MB 1024 MB
Core Speed 900 MHz 775 MHz
Memory Speed 3564 MHz 2250 MHz
Power (Max TDP) 65 watts 106 watts
Bandwidth 57024 MB/sec 72000 MB/sec
Texel Rate 28800 Mtexels/sec 12400 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 12400 Mpixels/sec
Unified Shaders 384 320(64x5)
Texture Mapping Units 32 16
Render Output Units 16 16
Bus Type DDR3 GDDR4
Bus Width 128-bit 256-bit
Fab Process 28 nm 55 nm
Transistors 1300 million (Unknown) million
Bus PCIe 3.0 x16 PCIe 2.0 x16/AGP 8x
DirectX Version DirectX 11.0 DirectX 10.1
OpenGL Version OpenGL 4.2 OpenGL 3.0

Memory Bandwidth: Bandwidth is the max amount of information (measured in MB per second) that can be transported over the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory speed. In the case of DDR RAM, 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 AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The higher the texel rate, 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 that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines 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 potential to reach the maximum fill rate.

Display Prices

Hide Prices

GeForce GT 640 DDR3

Amazon.com

Check prices at:

Radeon HD 3870 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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