GeForce 8800 GT 1GB vs Radeon R9 M275X

Intro

Compare those specs to the Radeon R9 M275X, which features GPU clock speed of 900 MHz, and 2048 MB of GDDR5 RAM set to run at 1125 MHz through a 128-bit bus. It also features 640 Stream Processors, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M275X		50 Watts
GeForce 8800 GT 1GB		105 Watts
	Difference: 55 Watts (110%)

Memory Bandwidth

The Radeon R9 M275X should in theory be a lot faster than the GeForce 8800 GT 1GB overall. (explain)

Radeon R9 M275X		72000 MB/sec
GeForce 8800 GT 1GB		57600 MB/sec
	Difference: 14400 (25%)

Texel Rate

The Radeon R9 M275X should be a small bit (more or less 7%) better at anisotropic filtering than the GeForce 8800 GT 1GB. (explain)

Radeon R9 M275X		36000 Mtexels/sec
GeForce 8800 GT 1GB		33600 Mtexels/sec
	Difference: 2400 (7%)

Pixel Rate

The Radeon R9 M275X will be much (approximately 50%) better at full screen anti-aliasing than the GeForce 8800 GT 1GB, and will be capable of handling higher screen resolutions more effectively. (explain)

Radeon R9 M275X		14400 Mpixels/sec
GeForce 8800 GT 1GB		9600 Mpixels/sec
	Difference: 4800 (50%)

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 (measured in megabytes per second) that can be transferred past the external memory interface within a second. The number is worked out by multiplying the bus width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better 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 number of texture map elements (texels) that are applied per second. This number is calculated by multiplying the total number of texture units 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 a second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output 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 max fill rate.