GeForce 8800 Ultra vs Radeon R9 M275X

Intro

Compare those specifications to the Radeon R9 M275X, which makes use of a 28 nm design. AMD has set the core speed at 900 MHz. The GDDR5 memory runs at a speed of 1125 MHz on this card. It features 640 SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M275X		50 Watts
GeForce 8800 Ultra		171 Watts
	Difference: 121 Watts (242%)

Memory Bandwidth

In theory, the GeForce 8800 Ultra should be a lot faster than the Radeon R9 M275X overall. (explain)

GeForce 8800 Ultra		103680 MB/sec
Radeon R9 M275X		72000 MB/sec
	Difference: 31680 (44%)

Texel Rate

The GeForce 8800 Ultra will be a little bit (approximately 9%) more effective at texture filtering than the Radeon R9 M275X. (explain)

GeForce 8800 Ultra		39168 Mtexels/sec
Radeon R9 M275X		36000 Mtexels/sec
	Difference: 3168 (9%)

Pixel Rate

If running with high levels of AA is important to you, then the GeForce 8800 Ultra is a better choice, though only just barely. (explain)

GeForce 8800 Ultra		14688 Mpixels/sec
Radeon R9 M275X		14400 Mpixels/sec
	Difference: 288 (2%)

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 moved past the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, 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 texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at 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 that the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output 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 reach the max fill rate.