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GeForce GT 640 DDR3 vs Radeon HD 5850

Intro

The GeForce GT 640 DDR3 features a GPU core speed of 900 MHz, and the 2048 MB of DDR3 memory is set to run at 1782 MHz through a 128-bit bus. It also is made up of 384 SPUs, 32 TAUs, and 16 ROPs.

Compare all that to the Radeon HD 5850, which features a GPU core clock speed of 725 MHz, and 1024 MB of GDDR5 memory running at 1000 MHz through a 256-bit bus. It also features 1440(288x5) Stream Processors, 72 TAUs, and 32 ROPs.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3 65 Watts
Radeon HD 5850 151 Watts
Difference: 86 Watts (132%)

Memory Bandwidth

Performance-wise, the Radeon HD 5850 should theoretically be much better than the GeForce GT 640 DDR3 in general. (explain)

Radeon HD 5850 128000 MB/sec
GeForce GT 640 DDR3 57024 MB/sec
Difference: 70976 (124%)

Texel Rate

The Radeon HD 5850 is a lot (more or less 81%) more effective at AF than the GeForce GT 640 DDR3. (explain)

Radeon HD 5850 52200 Mtexels/sec
GeForce GT 640 DDR3 28800 Mtexels/sec
Difference: 23400 (81%)

Pixel Rate

The Radeon HD 5850 is a lot (approximately 61%) faster with regards to AA than the GeForce GT 640 DDR3, and will be capable of handling higher resolutions without losing too much performance. (explain)

Radeon HD 5850 23200 Mpixels/sec
GeForce GT 640 DDR3 14400 Mpixels/sec
Difference: 8800 (61%)

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

GeForce GT 640 DDR3

Amazon.com

Radeon HD 5850

Amazon.com

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

Model GeForce GT 640 DDR3 Radeon HD 5850
Manufacturer nVidia AMD
Year June 2012 September 30, 2009
Code Name GK107 Cypress PRO
Fab Process 28 nm 40 nm
Bus PCIe 3.0 x16 PCIe 2.1 x16
Memory 2048 MB 1024 MB
Core Speed 900 MHz 725 MHz
Shader Speed 900 MHz (N/A) MHz
Memory Speed 1782 MHz (3564 MHz effective) 1000 MHz (4000 MHz effective)
Unified Shaders 384 1440(288x5)
Texture Mapping Units 32 72
Render Output Units 16 32
Bus Type DDR3 GDDR5
Bus Width 128-bit 256-bit
DirectX Version DirectX 11.0 DirectX 11
OpenGL Version OpenGL 4.2 OpenGL 3.2
Power (Max TDP) 65 watts 151 watts
Shader Model 5.0 5.0
Bandwidth 57024 MB/sec 128000 MB/sec
Texel Rate 28800 Mtexels/sec 52200 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 23200 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the max amount of information (counted in megabytes per second) that can be transported over the external memory interface within a second. It is worked out by multiplying the interface width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better 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 amount of texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total number of texture units 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 in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

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