GeForce GTX 970 vs Radeon HD 5770

Intro

Compare all that to the Radeon HD 5770, which comes with a clock frequency of 850 MHz and a GDDR5 memory frequency of 1200 MHz. It also makes use of a 128-bit memory bus, and uses a 40 nm design. It is made up of 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5770		108 Watts
GeForce GTX 970		145 Watts
	Difference: 37 Watts (34%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 970 will be 192% faster than the Radeon HD 5770 overall, because of its higher bandwidth. (explain)

GeForce GTX 970		224000 MB/sec
Radeon HD 5770		76800 MB/sec
	Difference: 147200 (192%)

Texel Rate

The GeForce GTX 970 will be a lot (approximately 221%) better at anisotropic filtering than the Radeon HD 5770. (explain)

GeForce GTX 970		109200 Mtexels/sec
Radeon HD 5770		34000 Mtexels/sec
	Difference: 75200 (221%)

Pixel Rate

The GeForce GTX 970 should be a lot (about 394%) more effective at full screen anti-aliasing than the Radeon HD 5770, and able to handle higher resolutions more effectively. (explain)

GeForce GTX 970		67200 Mpixels/sec
Radeon HD 5770		13600 Mpixels/sec
	Difference: 53600 (394%)

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 (measured in megabytes per second) that can be transported across the external memory interface in one second. The number is calculated by multiplying the interface width by its memory speed. If the card has DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the card will be at handling 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 can possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes 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, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.