GeForce GTX 260 Core 216 vs Radeon R9 M275X

Intro

Compare all that to the Radeon R9 M275X, which uses a 28 nm design. AMD has clocked the core speed at 900 MHz. The GDDR5 RAM runs at a speed of 1125 MHz on this particular model. It features 640 SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M275X		50 Watts
GeForce GTX 260 Core 216		202 Watts
	Difference: 152 Watts (304%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 260 Core 216 should in theory be quite a bit better than the Radeon R9 M275X in general. (explain)

GeForce GTX 260 Core 216		111888 MB/sec
Radeon R9 M275X		72000 MB/sec
	Difference: 39888 (55%)

Texel Rate

The GeForce GTX 260 Core 216 is a bit (more or less 15%) better at AF than the Radeon R9 M275X. (explain)

GeForce GTX 260 Core 216		41472 Mtexels/sec
Radeon R9 M275X		36000 Mtexels/sec
	Difference: 5472 (15%)

Pixel Rate

The GeForce GTX 260 Core 216 will be a small bit (approximately 12%) faster with regards to full screen anti-aliasing than the Radeon R9 M275X, and also capable of handling higher screen resolutions better. (explain)

GeForce GTX 260 Core 216		16128 Mpixels/sec
Radeon R9 M275X		14400 Mpixels/sec
	Difference: 1728 (12%)

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 information (in units of megabytes per second) that can be transferred over the external memory interface in one second. It is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total texture units by the core speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also 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 maximum fill rate.