GeForce GTX 650 vs Radeon HD 4770

Intro

Compare all of that to the Radeon HD 4770, which has core speeds of 750 MHz on the GPU, and 800 MHz on the 512 MB of GDDR5 RAM. It features 640(128x5) SPUs along with 32 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650		64 Watts
Radeon HD 4770		80 Watts
	Difference: 16 Watts (25%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 650 will be 56% faster than the Radeon HD 4770 in general, due to its higher bandwidth. (explain)

GeForce GTX 650		80000 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 28800 (56%)

Texel Rate

The GeForce GTX 650 should be a lot (about 41%) more effective at anisotropic filtering than the Radeon HD 4770. (explain)

GeForce GTX 650		33856 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 9856 (41%)

Pixel Rate

The GeForce GTX 650 will be a lot (approximately 41%) more effective at full screen anti-aliasing than the Radeon HD 4770, and will be capable of handling higher screen resolutions more effectively. (explain)

GeForce GTX 650		16928 Mpixels/sec
Radeon HD 4770		12000 Mpixels/sec
	Difference: 4928 (41%)

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: Bandwidth is the maximum amount of data (measured in megabytes per second) that can be moved across the external memory interface in one second. It is calculated by multiplying the bus width by its memory clock speed. In the case of DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster 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 are processed per second. This is calculated by multiplying the total texture units by the core speed of the chip. The higher the texel rate, 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 number of pixels the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs 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 output rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.