GeForce 8800 GTX vs Radeon R9 M275X

Intro

Compare all that to the Radeon R9 M275X, which has clock speeds of 900 MHz on the GPU, and 1125 MHz on the 2048 MB of GDDR5 RAM. It features 640 SPUs along with 40 Texture Address Units and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M275X		50 Watts
GeForce 8800 GTX		155 Watts
	Difference: 105 Watts (210%)

Memory Bandwidth

As far as performance goes, the GeForce 8800 GTX should theoretically be just a bit superior to the Radeon R9 M275X in general. (explain)

GeForce 8800 GTX		86400 MB/sec
Radeon R9 M275X		72000 MB/sec
	Difference: 14400 (20%)

Texel Rate

The GeForce 8800 GTX will be a bit (more or less 2%) faster with regards to anisotropic filtering than the Radeon R9 M275X. (explain)

GeForce 8800 GTX		36800 Mtexels/sec
Radeon R9 M275X		36000 Mtexels/sec
	Difference: 800 (2%)

Pixel Rate

The Radeon R9 M275X will be a bit (approximately 4%) better at full screen anti-aliasing than the GeForce 8800 GTX, and will be capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon R9 M275X		14400 Mpixels/sec
GeForce 8800 GTX		13800 Mpixels/sec
	Difference: 600 (4%)

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 (in units of MB per second) that can be transferred past the external memory interface in one second. It's worked out by multiplying the interface width by its memory speed. If it uses DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster 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 amount of texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the video card will be at handling 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 the video card can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.