GeForce GTX 660 vs Radeon HD 7770

Intro

Compare all of that to the Radeon HD 7770, which has GPU clock speed of 1000 MHz, and 1024 MB of GDDR5 memory set to run at 1125 MHz through a 128-bit bus. It also features 640 Stream Processors, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

GeForce GTX 660		5063 points
Radeon HD 7770		3180 points
	Difference: 1883 (59%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770		80 Watts
GeForce GTX 660		140 Watts
	Difference: 60 Watts (75%)

Memory Bandwidth

Theoretically, the GeForce GTX 660 should perform a lot faster than the Radeon HD 7770 overall. (explain)

GeForce GTX 660		144192 MB/sec
Radeon HD 7770		72000 MB/sec
	Difference: 72192 (100%)

Texel Rate

The GeForce GTX 660 is a lot (approximately 96%) better at AF than the Radeon HD 7770. (explain)

GeForce GTX 660		78400 Mtexels/sec
Radeon HD 7770		40000 Mtexels/sec
	Difference: 38400 (96%)

Pixel Rate

The GeForce GTX 660 should be a lot (about 47%) more effective at FSAA than the Radeon HD 7770, and also will be able to handle higher resolutions without losing too much performance. (explain)

GeForce GTX 660		23520 Mpixels/sec
Radeon HD 7770		16000 Mpixels/sec
	Difference: 7520 (47%)

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 max amount of information (counted in MB per second) that can be moved over the external memory interface in one second. It's calculated by multiplying the interface width by its memory speed. If the card has DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the video 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 most pixels the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units 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, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.