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GeForce GT 640 DDR3 vs Radeon HD 3850 256MB

Intro

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

Compare all that to the Radeon HD 3850 256MB, which has clock speeds of 668 MHz on the GPU, and 828 MHz on the 256 MB of GDDR3 memory. It features 320(64x5) SPUs as well as 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 3850 256MB 75 Watts
Difference: 10 Watts (15%)

Memory Bandwidth

In theory, the GeForce GT 640 DDR3 should be just a bit faster than the Radeon HD 3850 256MB in general. (explain)

GeForce GT 640 DDR3 57024 MB/sec
Radeon HD 3850 256MB 52992 MB/sec
Difference: 4032 (8%)

Texel Rate

The GeForce GT 640 DDR3 is a lot (more or less 169%) faster with regards to AF than the Radeon HD 3850 256MB. (explain)

GeForce GT 640 DDR3 28800 Mtexels/sec
Radeon HD 3850 256MB 10688 Mtexels/sec
Difference: 18112 (169%)

Pixel Rate

The GeForce GT 640 DDR3 should be quite a bit (approximately 35%) more effective at FSAA than the Radeon HD 3850 256MB, and also should be able to handle higher screen resolutions without slowing down too much. (explain)

GeForce GT 640 DDR3 14400 Mpixels/sec
Radeon HD 3850 256MB 10688 Mpixels/sec
Difference: 3712 (35%)

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 3850 256MB

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 3850 256MB
Manufacturer nVidia AMD
Year June 2012 Nov 19, 2007
Code Name GK107 RV670 PRO
Memory 2048 MB 256 MB
Core Speed 900 MHz 668 MHz
Memory Speed 3564 MHz 1656 MHz
Power (Max TDP) 65 watts 75 watts
Bandwidth 57024 MB/sec 52992 MB/sec
Texel Rate 28800 Mtexels/sec 10688 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 10688 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 largest amount of data (measured in MB per second) that can be transferred past the external memory interface in one second. It is calculated by multiplying the bus width by its memory speed. In the case of DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster 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 are applied per second. This figure is worked out by multiplying the total amount of texture units by the core clock 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 processed in one second.

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

Display Prices

Hide Prices

GeForce GT 640 DDR3

Amazon.com

Check prices at:

Radeon HD 3850 256MB

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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