GeForce GT 640 DDR3 vs Radeon R9 380X

Intro

Compare all that to the Radeon R9 380X, which features core speeds of 970 MHz on the GPU, and 1425 MHz on the 4096 MB of GDDR5 RAM. 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

Performance-wise, the Radeon R9 380X should theoretically be quite a bit superior to the GeForce GT 640 DDR3 in general. (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 a lot (more or less 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

The Radeon R9 380X will be much (approximately 116%) better at anti-aliasing than the GeForce GT 640 DDR3, and also capable of handling higher resolutions better. (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 data (in units of megabytes per second) that can be transferred across the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory speed. If the card has DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines 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 fill rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.