GeForce GTX 275 vs Radeon R9 380X

Intro

Compare all that to the Radeon R9 380X, which has core 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 Texture Address Units and 32 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

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

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

Texel Rate

The Radeon R9 380X will be quite a bit (about 145%) better at texture filtering than the GeForce GTX 275. (explain)

Radeon R9 380X		124160 Mtexels/sec
GeForce GTX 275		50640 Mtexels/sec
	Difference: 73520 (145%)

Pixel Rate

The Radeon R9 380X should be a lot (more or less 75%) better at FSAA than the GeForce GTX 275, and also capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon R9 380X		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: Bandwidth is the max amount of data (measured in MB per second) that can be transported across the external memory interface in a second. It is worked out by multiplying the interface width by its memory clock speed. If the card has DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.