GeForce GTX 650 vs Radeon R9 M295X

Intro

Compare those specs to the Radeon R9 M295X, which comes with GPU core speed of 750 MHz, and 4096 MB of GDDR5 RAM set to run at 1375 MHz through a 256-bit bus. It also features 2048 SPUs, 128 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650		64 Watts
Radeon R9 M295X		125 Watts
	Difference: 61 Watts (95%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 M295X should be 120% faster than the GeForce GTX 650 in general, because of its greater data rate. (explain)

Radeon R9 M295X		176000 MB/sec
GeForce GTX 650		80000 MB/sec
	Difference: 96000 (120%)

Texel Rate

The Radeon R9 M295X is quite a bit (approximately 184%) better at texture filtering than the GeForce GTX 650. (explain)

Radeon R9 M295X		96000 Mtexels/sec
GeForce GTX 650		33856 Mtexels/sec
	Difference: 62144 (184%)

Pixel Rate

The Radeon R9 M295X is a lot (more or less 42%) more effective at FSAA than the GeForce GTX 650, and also will be capable of handling higher resolutions without losing too much performance. (explain)

Radeon R9 M295X		24000 Mpixels/sec
GeForce GTX 650		16928 Mpixels/sec
	Difference: 7072 (42%)

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 maximum amount of data (measured in MB per second) that can be moved over the external memory interface in one second. The number is worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 amount of texture map elements (texels) that are applied per second. This figure is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of 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 fill rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.