GeForce GTX 980 vs Radeon HD 7770

Intro

Compare those specifications to the Radeon HD 7770, which uses a 28 nm design. AMD has clocked the core frequency at 1000 MHz. The GDDR5 RAM is set to run at a frequency of 1125 MHz on this model. It features 640 SPUs along with 40 TAUs and 16 Rasterization Operator Units.

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 980		13552 points
Radeon HD 7770		3180 points
	Difference: 10372 (326%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770		80 Watts
GeForce GTX 980		165 Watts
	Difference: 85 Watts (106%)

Memory Bandwidth

Performance-wise, the GeForce GTX 980 should theoretically be much better than the Radeon HD 7770 in general. (explain)

GeForce GTX 980		224000 MB/sec
Radeon HD 7770		72000 MB/sec
	Difference: 152000 (211%)

Texel Rate

The GeForce GTX 980 is quite a bit (more or less 260%) better at AF than the Radeon HD 7770. (explain)

GeForce GTX 980		144128 Mtexels/sec
Radeon HD 7770		40000 Mtexels/sec
	Difference: 104128 (260%)

Pixel Rate

The GeForce GTX 980 is quite a bit (more or less 350%) better at AA than the Radeon HD 7770, and should be capable of handling higher screen resolutions while still performing well. (explain)

GeForce GTX 980		72064 Mpixels/sec
Radeon HD 7770		16000 Mpixels/sec
	Difference: 56064 (350%)

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 (measured in MB per second) that can be moved over the external memory interface within a second. The number is worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better 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 are applied in one second. This number is calculated by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the graphics 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 amount of pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the core 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 fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.