GeForce GTX 460 vs Radeon R7 250X 2GB

Intro

Compare those specifications to the Radeon R7 250X 2GB, which makes use of a 28 nm design. AMD has set the core speed at 1000 MHz. The GDDR5 RAM is set to run at a frequency of 1125 MHz on this model. It features 640 SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 250X 2GB		95 Watts
GeForce GTX 460		150 Watts
	Difference: 55 Watts (58%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 460 will be 20% quicker than the Radeon R7 250X 2GB overall, due to its greater data rate. (explain)

GeForce GTX 460		86400 MB/sec
Radeon R7 250X 2GB		72000 MB/sec
	Difference: 14400 (20%)

Texel Rate

The Radeon R7 250X 2GB should be a little bit (more or less 6%) more effective at anisotropic filtering than the GeForce GTX 460. (explain)

Radeon R7 250X 2GB		40000 Mtexels/sec
GeForce GTX 460		37800 Mtexels/sec
	Difference: 2200 (6%)

Pixel Rate

The GeForce GTX 460 will be a little bit (about 1%) more effective at full screen anti-aliasing than the Radeon R7 250X 2GB, and also should be capable of handling higher resolutions without losing too much performance. (explain)

GeForce GTX 460		16200 Mpixels/sec
Radeon R7 250X 2GB		16000 Mpixels/sec
	Difference: 200 (1%)

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 largest amount of information (measured in megabytes per second) that can be transported over the external memory interface within a second. The number is calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.