GeForce GTX 980M vs Radeon HD 5670

Intro

Compare those specs to the Radeon HD 5670, which uses a 40 nm design. AMD has clocked the core speed at 775 MHz. The GDDR5 RAM runs at a speed of 1000 MHz on this particular card. It features 400(80x5) SPUs as well as 20 Texture Address Units and 8 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5670		61 Watts
GeForce GTX 980M		100 Watts
	Difference: 39 Watts (64%)

Memory Bandwidth

In theory, the GeForce GTX 980M should be 100% quicker than the Radeon HD 5670 overall, due to its greater data rate. (explain)

GeForce GTX 980M		128000 MB/sec
Radeon HD 5670		64000 MB/sec
	Difference: 64000 (100%)

Texel Rate

The GeForce GTX 980M will be a lot (approximately 543%) more effective at texture filtering than the Radeon HD 5670. (explain)

GeForce GTX 980M		99648 Mtexels/sec
Radeon HD 5670		15500 Mtexels/sec
	Difference: 84148 (543%)

Pixel Rate

The GeForce GTX 980M is quite a bit (more or less 971%) better at full screen anti-aliasing than the Radeon HD 5670, and should be able to handle higher resolutions without losing too much performance. (explain)

GeForce GTX 980M		66432 Mpixels/sec
Radeon HD 5670		6200 Mpixels/sec
	Difference: 60232 (971%)

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 maximum amount of information (counted in MB per second) that can be transported past the external memory interface in a second. It is worked out by multiplying the bus width by its memory clock speed. If it uses DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better 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 amount of texture map elements (texels) that are processed per second. This number is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the 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 that the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the clock 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 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 maximum fill rate.