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GeForce GT 640 DDR3 vs Radeon HD 4750

Intro

The GeForce GT 640 DDR3 features clock speeds of 900 MHz on the GPU, and 1782 MHz on the 2048 MB of DDR3 memory. It features 384 SPUs as well as 32 TAUs and 16 ROPs.

Compare those specs to the Radeon HD 4750, which has a clock frequency of 730 MHz and a GDDR5 memory speed of 800 MHz. It also uses a 128-bit memory bus, and uses a 40 nm design. It is comprised of 640(128x5) SPUs, 32 TAUs, and 16 Raster Operation Units.

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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

In theory, the GeForce GT 640 DDR3 is 11% quicker than the Radeon HD 4750 overall, because of its higher bandwidth. (explain)

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

Texel Rate

The GeForce GT 640 DDR3 is much (more or less 23%) better 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 is a lot (about 23%) better at anti-aliasing than the Radeon HD 4750, and also will be able to handle higher screen resolutions while still performing well. (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: Memory bandwidth is the maximum amount of information (measured in megabytes per second) that can be transported across the external memory interface within a second. It's calculated by multiplying the interface width by its memory speed. If the card has DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better this number, the better the graphics 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 the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many 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

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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