GeForce GTS 150 vs Radeon HD 7770

Intro

Compare all of that to the Radeon HD 7770, which features GPU core speed of 1000 MHz, and 1024 MB of GDDR5 memory running at 1125 MHz through a 128-bit bus. It also is made up of 640 SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770		80 Watts
GeForce GTS 150		141 Watts
	Difference: 61 Watts (76%)

Memory Bandwidth

Performance-wise, the Radeon HD 7770 should theoretically be quite a bit better than the GeForce GTS 150 in general. (explain)

Radeon HD 7770		72000 MB/sec
GeForce GTS 150		32000 MB/sec
	Difference: 40000 (125%)

Texel Rate

The GeForce GTS 150 is a bit (more or less 18%) better at AF than the Radeon HD 7770. (explain)

GeForce GTS 150		47360 Mtexels/sec
Radeon HD 7770		40000 Mtexels/sec
	Difference: 7360 (18%)

Pixel Rate

The Radeon HD 7770 will be a lot (more or less 35%) more effective at FSAA than the GeForce GTS 150, and will be able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 7770		16000 Mpixels/sec
GeForce GTS 150		11840 Mpixels/sec
	Difference: 4160 (35%)

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 (measured in MB per second) that can be transported past the external memory interface in one second. The number is worked out by multiplying the bus width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of 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 amount of Raster Operations Pipelines by the the card's clock speed. 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 also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.