GeForce 8800 GTX vs Radeon R9 M275X

Intro

Compare all that to the Radeon R9 M275X, which features a clock speed of 900 MHz and a GDDR5 memory frequency of 1125 MHz. It also makes use of a 128-bit memory bus, and uses a 28 nm design. It is made up of 640 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

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 a bit better than 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 should be a small bit (more or less 2%) faster with regards to AF than the Radeon R9 M275X. (explain)

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

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon R9 M275X is a better choice, not by a very large margin though. (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 max amount of information (in units of MB per second) that can be moved past the external memory interface within a second. It's calculated by multiplying the card's bus width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. 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 applied 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 the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends 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.