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GeForce GT 640 DDR3 vs Radeon HD 4850 X2 512MB

Intro

The GeForce GT 640 DDR3 has a GPU clock 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 comprised of 384 Stream Processors, 32 TAUs, and 16 Raster Operation Units.

Compare those specs to the Radeon HD 4850 X2 512MB, which comes with core clock speeds of 625 MHz on the GPU, and 993 MHz on the 512 MB of GDDR3 RAM. It features 800(160x5) SPUs along with 40 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 4850 X2 512MB 250 Watts
Difference: 185 Watts (285%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4850 X2 512MB should be 123% faster than the GeForce GT 640 DDR3 in general, because of its higher bandwidth. (explain)

Radeon HD 4850 X2 512MB 127104 MB/sec
GeForce GT 640 DDR3 57024 MB/sec
Difference: 70080 (123%)

Texel Rate

The Radeon HD 4850 X2 512MB will be quite a bit (about 74%) better at texture filtering than the GeForce GT 640 DDR3. (explain)

Radeon HD 4850 X2 512MB 50000 Mtexels/sec
GeForce GT 640 DDR3 28800 Mtexels/sec
Difference: 21200 (74%)

Pixel Rate

The Radeon HD 4850 X2 512MB is a lot (approximately 39%) more effective at anti-aliasing than the GeForce GT 640 DDR3, and will be capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 4850 X2 512MB 20000 Mpixels/sec
GeForce GT 640 DDR3 14400 Mpixels/sec
Difference: 5600 (39%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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GeForce GT 640 DDR3

Amazon.com

Check prices at:

Radeon HD 4850 X2 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 4850 X2 512MB
Manufacturer nVidia AMD
Year June 2012 Nov 7, 2008
Code Name GK107 R700
Memory 2048 MB 512 MB (x2)
Core Speed 900 MHz 625 MHz (x2)
Memory Speed 3564 MHz 1986 MHz (x2)
Power (Max TDP) 65 watts 250 watts
Bandwidth 57024 MB/sec 127104 MB/sec
Texel Rate 28800 Mtexels/sec 50000 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 20000 Mpixels/sec
Unified Shaders 384 800(160x5) (x2)
Texture Mapping Units 32 40 (x2)
Render Output Units 16 16 (x2)
Bus Type DDR3 GDDR3
Bus Width 128-bit 256-bit (x2)
Fab Process 28 nm 55 nm
Transistors 1300 million 956 million
Bus PCIe 3.0 x16 PCIe 2.0 x16 (PCIe bridge)
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 information (measured in megabytes per second) that can be moved across the external memory interface within a second. It is calculated by multiplying the bus width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This is calculated by multiplying the total number of texture units of the card by the core clock 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 per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines 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 is also dependant 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 max fill rate.

Display Prices

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GeForce GT 640 DDR3

Amazon.com

Check prices at:

Radeon HD 4850 X2 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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