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GeForce GT 640 DDR3 vs Radeon HD 3870 512MB

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 memory bus, and makes use of a 28 nm design. It is made up of 384 SPUs, 32 TAUs, and 16 Raster Operation Units.

Compare those specifications to the Radeon HD 3870 512MB, which uses a 55 nm design. AMD has set the core frequency at 775 MHz. The GDDR3 RAM runs at a speed of 900 MHz on this specific card. It features 320(64x5) SPUs along with 16 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3 65 Watts
Radeon HD 3870 512MB 106 Watts
Difference: 41 Watts (63%)

Memory Bandwidth

Theoretically, the Radeon HD 3870 512MB should be a small bit faster than the GeForce GT 640 DDR3 overall. (explain)

Radeon HD 3870 512MB 57600 MB/sec
GeForce GT 640 DDR3 57024 MB/sec
Difference: 576 (1%)

Texel Rate

The GeForce GT 640 DDR3 will be much (about 132%) more effective at texture filtering than the Radeon HD 3870 512MB. (explain)

GeForce GT 640 DDR3 28800 Mtexels/sec
Radeon HD 3870 512MB 12400 Mtexels/sec
Difference: 16400 (132%)

Pixel Rate

The GeForce GT 640 DDR3 is a bit (approximately 16%) more effective at FSAA than the Radeon HD 3870 512MB, 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 512MB 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 512MB

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 512MB
Manufacturer nVidia AMD
Year June 2012 Nov 19, 2007
Code Name GK107 RV670 XT
Memory 2048 MB 512 MB
Core Speed 900 MHz 775 MHz
Memory Speed 3564 MHz 1800 MHz
Power (Max TDP) 65 watts 106 watts
Bandwidth 57024 MB/sec 57600 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 GDDR3
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: Memory bandwidth is the maximum amount of data (counted in megabytes per second) that can be transferred across the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory speed. If it uses DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, 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 maximum amount of pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the core 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 rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

GeForce GT 640 DDR3

Amazon.com

Check prices at:

Radeon HD 3870 512MB

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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