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GeForce GT 640 DDR3 vs Radeon HD 3850 512MB

Intro

The GeForce GT 640 DDR3 comes with a GPU core clock speed of 900 MHz, and the 2048 MB of DDR3 memory runs at 1782 MHz through a 128-bit bus. It also features 384 SPUs, 32 TAUs, and 16 ROPs.

Compare those specs to the Radeon HD 3850 512MB, which has clock speeds of 668 MHz on the GPU, and 828 MHz on the 512 MB of GDDR3 memory. It features 320(64x5) SPUs along with 16 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3 65 Watts
Radeon HD 3850 512MB 75 Watts
Difference: 10 Watts (15%)

Memory Bandwidth

The GeForce GT 640 DDR3, in theory, should perform just a bit faster than the Radeon HD 3850 512MB overall. (explain)

GeForce GT 640 DDR3 57024 MB/sec
Radeon HD 3850 512MB 52992 MB/sec
Difference: 4032 (8%)

Texel Rate

The GeForce GT 640 DDR3 is quite a bit (about 169%) better at AF than the Radeon HD 3850 512MB. (explain)

GeForce GT 640 DDR3 28800 Mtexels/sec
Radeon HD 3850 512MB 10688 Mtexels/sec
Difference: 18112 (169%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce GT 640 DDR3 is a better choice, and very much so. (explain)

GeForce GT 640 DDR3 14400 Mpixels/sec
Radeon HD 3850 512MB 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

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Radeon HD 3850 512MB

Amazon.com

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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 512MB
Manufacturer nVidia AMD
Year June 2012 Nov 19, 2007
Code Name GK107 RV670 PRO
Memory 2048 MB 512 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: Bandwidth is the max amount of data (in units of MB per second) that can be transferred across the external memory interface in one second. It's calculated by multiplying the bus width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, 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 number is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip 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 colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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GeForce GT 640 DDR3

Amazon.com

Check prices at:

Radeon HD 3850 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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