GeForce GTX 660 vs Radeon HD 6770

Intro

Compare those specifications to the Radeon HD 6770, which uses a 40 nm design. AMD has set the core frequency at 900 MHz. The GDDR5 RAM runs at a speed of 1050 MHz on this particular model. It features 800 SPUs as well as 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 6770		1520 points
	Difference: 3543 (233%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770		108 Watts
GeForce GTX 660		140 Watts
	Difference: 32 Watts (30%)

Memory Bandwidth

In theory, the GeForce GTX 660 is 115% quicker than the Radeon HD 6770 in general, due to its higher bandwidth. (explain)

GeForce GTX 660		144192 MB/sec
Radeon HD 6770		67200 MB/sec
	Difference: 76992 (115%)

Texel Rate

The GeForce GTX 660 will be much (approximately 118%) better at AF than the Radeon HD 6770. (explain)

GeForce GTX 660		78400 Mtexels/sec
Radeon HD 6770		36000 Mtexels/sec
	Difference: 42400 (118%)

Pixel Rate

The GeForce GTX 660 is quite a bit (approximately 63%) more effective at anti-aliasing than the Radeon HD 6770, and also should be able to handle higher screen resolutions while still performing well. (explain)

GeForce GTX 660		23520 Mpixels/sec
Radeon HD 6770		14400 Mpixels/sec
	Difference: 9120 (63%)

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 data (counted in MB per second) that can be transported across the external memory interface in one second. It is calculated by multiplying the interface width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill 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 max fill rate.