GeForce GT 640 DDR3 vs Radeon R9 380X

Intro

Compare those specifications to the Radeon R9 380X, which makes use of a 28 nm design. AMD has clocked the core frequency at 970 MHz. The GDDR5 memory runs at a frequency of 1425 MHz on this particular model. It features 2048 SPUs along with 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 should be 220% faster than the GeForce GT 640 DDR3 overall, due to 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 should be quite a bit (about 331%) more effective 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 high levels of AA is important to you, then the Radeon R9 380X is superior to the GeForce GT 640 DDR3, 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: Bandwidth is the largest amount of data (in units of MB per second) that can be transported over the external memory interface in a second. It is calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called 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 - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.