GeForce GTX 960 vs Radeon HD 4770

Intro

Compare those specifications to the Radeon HD 4770, which has GPU clock speed of 750 MHz, and 512 MB of GDDR5 memory set to run at 800 MHz through a 128-bit bus. It also is comprised of 640(128x5) Stream Processors, 32 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770		80 Watts
GeForce GTX 960		120 Watts
	Difference: 40 Watts (50%)

Memory Bandwidth

Theoretically, the GeForce GTX 960 should perform much faster than the Radeon HD 4770 in general. (explain)

GeForce GTX 960		112000 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 60800 (119%)

Texel Rate

The GeForce GTX 960 is quite a bit (more or less 201%) faster with regards to anisotropic filtering than the Radeon HD 4770. (explain)

GeForce GTX 960		72128 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 48128 (201%)

Pixel Rate

The GeForce GTX 960 will be quite a bit (more or less 201%) faster with regards to anti-aliasing than the Radeon HD 4770, and capable of handling higher resolutions while still performing well. (explain)

GeForce GTX 960		36064 Mpixels/sec
Radeon HD 4770		12000 Mpixels/sec
	Difference: 24064 (201%)

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 information (measured in MB per second) that can be moved across the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory speed. If the card has DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.