GeForce GT 220 GDDR3 vs Radeon R9 M275X

Intro

Compare all that to the Radeon R9 M275X, which has GPU clock speed of 900 MHz, and 2048 MB of GDDR5 RAM running at 1125 MHz through a 128-bit bus. It also is made up of 640 SPUs, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M275X		50 Watts
GeForce GT 220 GDDR3		58 Watts
	Difference: 8 Watts (16%)

Memory Bandwidth

Performance-wise, the Radeon R9 M275X should theoretically be a lot superior to the GeForce GT 220 GDDR3 in general. (explain)

Radeon R9 M275X		72000 MB/sec
GeForce GT 220 GDDR3		32384 MB/sec
	Difference: 39616 (122%)

Texel Rate

The Radeon R9 M275X should be quite a bit (more or less 260%) faster with regards to texture filtering than the GeForce GT 220 GDDR3. (explain)

Radeon R9 M275X		36000 Mtexels/sec
GeForce GT 220 GDDR3		10000 Mtexels/sec
	Difference: 26000 (260%)

Pixel Rate

The Radeon R9 M275X is quite a bit (about 188%) better at full screen anti-aliasing than the GeForce GT 220 GDDR3, and able to handle higher screen resolutions without losing too much performance. (explain)

Radeon R9 M275X		14400 Mpixels/sec
GeForce GT 220 GDDR3		5000 Mpixels/sec
	Difference: 9400 (188%)

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 data (counted in megabytes per second) that can be transferred over the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This number is worked out by multiplying the total amount of texture units of the card by the core 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 processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.