GeForce GTX 980 vs Radeon HD 7770

Intro

Compare that to the Radeon HD 7770, which has clock speeds of 1000 MHz on the GPU, and 1125 MHz on the 1024 MB of GDDR5 RAM. It features 640 SPUs as well as 40 TAUs 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 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

Theoretically speaking, the GeForce GTX 980 should be 211% faster than the Radeon HD 7770 overall, due to its greater bandwidth. (explain)

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

Texel Rate

The GeForce GTX 980 will be a lot (about 260%) better at anisotropic filtering 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 will be quite a bit (more or less 350%) faster with regards to FSAA than the Radeon HD 7770, and able to handle higher screen resolutions better. (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 information (measured in MB per second) that can be transferred over the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the video 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 could possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the core 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 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 get to the maximum fill rate.