GeForce GT 640 DDR3 vs Radeon R9 380X

Intro

Compare those specs to the Radeon R9 380X, which comes with GPU core speed of 970 MHz, and 4096 MB of GDDR5 memory running at 1425 MHz through a 256-bit bus. It also is comprised of 2048 Stream Processors, 128 Texture Address Units, and 32 ROPs.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon R9 380X		9519 points
GeForce GT 640 DDR3		1560 points
	Difference: 7959 (510%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
Radeon R9 380X		190 Watts
	Difference: 125 Watts (192%)

Memory Bandwidth

In theory, the Radeon R9 380X is 220% quicker than the GeForce GT 640 DDR3 in general, because of its greater data rate. (explain)

Radeon R9 380X		182400 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 125376 (220%)

Texel Rate

The Radeon R9 380X will be quite a bit (approximately 331%) faster with regards to texture filtering than the GeForce GT 640 DDR3. (explain)

Radeon R9 380X		124160 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 95360 (331%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon R9 380X is a better choice, by far. (explain)

Radeon R9 380X		31040 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 16640 (116%)

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

Specifications

Memory Bandwidth: Memory bandwidth is the max amount of information (in units of megabytes per second) that can be transported past the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the 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 per second. This number is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.