GeForce GTX 275 vs Radeon R9 380 4G

Intro

Compare those specs to the Radeon R9 380 4G, which makes use of a 28 nm design. AMD has set the core frequency at 970 MHz. The GDDR5 RAM works at a speed of 1425 MHz on this specific model. It features 1792 SPUs as well as 112 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 380 4G		190 Watts
GeForce GTX 275		219 Watts
	Difference: 29 Watts (15%)

Memory Bandwidth

The Radeon R9 380 4G, in theory, should be much faster than the GeForce GTX 275 overall. (explain)

Radeon R9 380 4G		182400 MB/sec
GeForce GTX 275		127008 MB/sec
	Difference: 55392 (44%)

Texel Rate

The Radeon R9 380 4G will be quite a bit (approximately 115%) more effective at texture filtering than the GeForce GTX 275. (explain)

Radeon R9 380 4G		108640 Mtexels/sec
GeForce GTX 275		50640 Mtexels/sec
	Difference: 58000 (115%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon R9 380 4G is superior to the GeForce GTX 275, by a large margin. (explain)

Radeon R9 380 4G		31040 Mpixels/sec
GeForce GTX 275		17724 Mpixels/sec
	Difference: 13316 (75%)

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 maximum amount of information (counted in MB per second) that can be transferred across the external memory interface within a second. It is worked out by multiplying the interface width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen 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 texture units by the core speed of the chip. The better the texel rate, the better the video card will be at 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 card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka 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, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.