GeForce GTX 660 vs Radeon HD 6790

Intro

Compare all of that to the Radeon HD 6790, which has core speeds of 840 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 memory. It features 800 SPUs along with 40 TAUs and 16 ROPs.

Display Graphs

Hide Graphs

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 6790		2150 points
	Difference: 2913 (135%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660		140 Watts
Radeon HD 6790		150 Watts
	Difference: 10 Watts (7%)

Memory Bandwidth

The GeForce GTX 660 should in theory be a bit faster than the Radeon HD 6790 in general. (explain)

GeForce GTX 660		144192 MB/sec
Radeon HD 6790		134400 MB/sec
	Difference: 9792 (7%)

Texel Rate

The GeForce GTX 660 will be quite a bit (about 133%) faster with regards to texture filtering than the Radeon HD 6790. (explain)

GeForce GTX 660		78400 Mtexels/sec
Radeon HD 6790		33600 Mtexels/sec
	Difference: 44800 (133%)

Pixel Rate

The GeForce GTX 660 is much (more or less 75%) better at AA than the Radeon HD 6790, and also should be able to handle higher resolutions while still performing well. (explain)

GeForce GTX 660		23520 Mpixels/sec
Radeon HD 6790		13440 Mpixels/sec
	Difference: 10080 (75%)

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 data (in units of megabytes per second) that can be transported over the external memory interface in one second. It's worked out by multiplying the bus width by the speed of its memory. If the card has DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.