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GeForce GT 640 DDR3 vs Radeon HD 4750

Intro

The GeForce GT 640 DDR3 makes use of a 28 nm design. nVidia has set the core frequency at 900 MHz. The DDR3 memory works at a speed of 1782 MHz on this particular card. It features 384 SPUs as well as 32 TAUs and 16 ROPs.

Compare those specs to the Radeon HD 4750, which has clock speeds of 730 MHz on the GPU, and 800 MHz on the 512 MB of GDDR5 RAM. It features 640(128x5) SPUs as well as 32 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3 65 Watts
Radeon HD 4750 75 Watts
Difference: 10 Watts (15%)

Memory Bandwidth

Theoretically speaking, the GeForce GT 640 DDR3 will be 11% faster than the Radeon HD 4750 in general, due to its higher data rate. (explain)

GeForce GT 640 DDR3 57024 MB/sec
Radeon HD 4750 51200 MB/sec
Difference: 5824 (11%)

Texel Rate

The GeForce GT 640 DDR3 will be a lot (more or less 23%) more effective at anisotropic filtering than the Radeon HD 4750. (explain)

GeForce GT 640 DDR3 28800 Mtexels/sec
Radeon HD 4750 23360 Mtexels/sec
Difference: 5440 (23%)

Pixel Rate

The GeForce GT 640 DDR3 should be a lot (approximately 23%) better at AA than the Radeon HD 4750, and also should be capable of handling higher screen resolutions without losing too much performance. (explain)

GeForce GT 640 DDR3 14400 Mpixels/sec
Radeon HD 4750 11680 Mpixels/sec
Difference: 2720 (23%)

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 4750

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 4750
Manufacturer nVidia AMD
Year June 2012
Code Name GK107 RV740
Memory 2048 MB 512 MB
Core Speed 900 MHz 730 MHz
Memory Speed 3564 MHz 3200 MHz
Power (Max TDP) 65 watts 75 watts
Bandwidth 57024 MB/sec 51200 MB/sec
Texel Rate 28800 Mtexels/sec 23360 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 11680 Mpixels/sec
Unified Shaders 384 640(128x5)
Texture Mapping Units 32 32
Render Output Units 16 16
Bus Type DDR3 GDDR5
Bus Width 128-bit 128-bit
Fab Process 28 nm 40 nm
Transistors 1300 million 826 million
Bus PCIe 3.0 x16 PCIe 2.0 x16
DirectX Version DirectX 11.0 DirectX 10.1
OpenGL Version OpenGL 4.2 OpenGL 3.0

Memory Bandwidth: Bandwidth is the maximum amount of information (in units of MB per second) that can be transferred across the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

GeForce GT 640 DDR3

Amazon.com

Check prices at:

Radeon HD 4750

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.

Comments

One Response to “GeForce GT 640 DDR3 vs Radeon HD 4750”
dejan says:

This is wrong information about asus gt 640 ddr3,bandwidth is not 57024 MB/sec,it is half that because you were multiplying efective clock 1782 MHz.Real clock is 891Mhz so banwidth is 28518 Mb/s.

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