GeForce GT 640 DDR3 vs Radeon R9 380X

Intro

Compare all of that to the Radeon R9 380X, which has core clock speeds of 970 MHz on the GPU, and 1425 MHz on the 4096 MB of GDDR5 RAM. It features 2048 SPUs as well as 128 TAUs 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

Theoretically, the Radeon R9 380X should perform quite a bit faster than the GeForce GT 640 DDR3 overall. (explain)

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

Texel Rate

The Radeon R9 380X should be a lot (about 331%) better at anisotropic 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 lots of anti-aliasing is important to you, then the Radeon R9 380X is superior to the GeForce GT 640 DDR3, and very much so. (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: Bandwidth is the largest amount of information (in units of megabytes per second) that can be transferred across the external memory interface within a second. It is calculated by multiplying the interface width by its memory speed. In the case of DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better this number, the better the graphics card will be at 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 chip could possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the card's clock speed. 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 fill rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.