GeForce 9800 GT 512MB vs Radeon R5 M255

Intro

Compare those specifications to the Radeon R5 M255, which comes with GPU clock speed of 940 MHz, and 2048 MB of DDR3 memory set to run at 1000 MHz through a 64-bit bus. It also is comprised of 320 SPUs, 20 TAUs, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the GeForce 9800 GT 512MB should be 260% quicker than the Radeon R5 M255 overall, due to its higher bandwidth. (explain)

GeForce 9800 GT 512MB		57600 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 41600 (260%)

Texel Rate

The GeForce 9800 GT 512MB will be a lot (more or less 79%) more effective at AF than the Radeon R5 M255. (explain)

GeForce 9800 GT 512MB		33600 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 14800 (79%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce 9800 GT 512MB is superior to the Radeon R5 M255, and very much so. (explain)

GeForce 9800 GT 512MB		9600 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 2080 (28%)

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 largest amount of data (in units of megabytes per second) that can be transferred past the external memory interface within a second. It's worked out by multiplying the card's interface width by its memory speed. If it uses DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. 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 rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.