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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 RAM is set to run at 1782 MHz through a 128-bit bus. It also is made up of 384 Stream Processors, 32 TAUs, and 16 ROPs.

Compare all that to the Radeon HD 5850, which has GPU clock speed of 725 MHz, and 1024 MB of GDDR5 memory set to run at 1000 MHz through a 256-bit bus. It also is comprised of 1440(288x5) SPUs, 72 TAUs, and 32 ROPs.

Display Graphs

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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

Theoretically speaking, the Radeon HD 5850 should be 124% faster than the GeForce GT 640 DDR3 overall, because of its higher data rate. (explain)

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

Texel Rate

The Radeon HD 5850 should be much (about 81%) more effective at texture filtering 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

If using a high resolution is important to you, then the Radeon HD 5850 is superior to the GeForce GT 640 DDR3, by a large margin. (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

Radeon HD 5850

Specifications

Display Specifications

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Model GeForce GT 640 DDR3 Radeon HD 5850
Manufacturer nVidia AMD
Year June 2012 September 30, 2009
Code Name GK107 Cypress PRO
Memory 2048 MB 1024 MB
Core Speed 900 MHz 725 MHz
Memory Speed 3564 MHz 4000 MHz
Power (Max TDP) 65 watts 151 watts
Bandwidth 57024 MB/sec 128000 MB/sec
Texel Rate 28800 Mtexels/sec 52200 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 23200 Mpixels/sec
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
Fab Process 28 nm 40 nm
Transistors 1300 million 2154 million
Bus PCIe 3.0 x16 PCIe 2.1 x16
DirectX Version DirectX 11.0 DirectX 11
OpenGL Version OpenGL 4.2 OpenGL 3.2

Memory Bandwidth: Bandwidth is the largest amount of data (measured in MB per second) that can be moved across the external memory interface in a second. The number is calculated by multiplying the interface width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better 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 amount of texture map elements (texels) that can be applied in one second. This figure is calculated by multiplying the total texture units 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 in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out 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 fill rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

GeForce GT 640 DDR3

Radeon HD 5850

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