GeForce GTS 150 vs Radeon R9 380X

Intro

Compare all that to the Radeon R9 380X, which has a GPU core clock 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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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTS 150		141 Watts
Radeon R9 380X		190 Watts
	Difference: 49 Watts (35%)

Memory Bandwidth

In theory, the Radeon R9 380X is 470% faster than the GeForce GTS 150 in general, because of its greater bandwidth. (explain)

Radeon R9 380X		182400 MB/sec
GeForce GTS 150		32000 MB/sec
	Difference: 150400 (470%)

Texel Rate

The Radeon R9 380X should be quite a bit (approximately 162%) better at texture filtering than the GeForce GTS 150. (explain)

Radeon R9 380X		124160 Mtexels/sec
GeForce GTS 150		47360 Mtexels/sec
	Difference: 76800 (162%)

Pixel Rate

If using a high resolution is important to you, then the Radeon R9 380X is the winner, by a large margin. (explain)

Radeon R9 380X		31040 Mpixels/sec
GeForce GTS 150		11840 Mpixels/sec
	Difference: 19200 (162%)

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 MB per second) that can be transported across the external memory interface within a second. It is worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total amount of texture units 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 in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.