GeForce GTX 650 vs Radeon HD 4850 2GB

Intro

Compare all of that to the Radeon HD 4850 2GB, which has core speeds of 625 MHz on the GPU, and 993 MHz on the 2048 MB of GDDR4 RAM. It features 800(160x5) SPUs as well as 40 TAUs 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 4850 2GB		110 Watts
	Difference: 46 Watts (72%)

Memory Bandwidth

The GeForce GTX 650 should in theory be much faster than the Radeon HD 4850 2GB in general. (explain)

GeForce GTX 650		80000 MB/sec
Radeon HD 4850 2GB		63552 MB/sec
	Difference: 16448 (26%)

Texel Rate

The GeForce GTX 650 should be quite a bit (approximately 35%) faster with regards to texture filtering than the Radeon HD 4850 2GB. (explain)

GeForce GTX 650		33856 Mtexels/sec
Radeon HD 4850 2GB		25000 Mtexels/sec
	Difference: 8856 (35%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX 650 is the winner, and very much so. (explain)

GeForce GTX 650		16928 Mpixels/sec
Radeon HD 4850 2GB		10000 Mpixels/sec
	Difference: 6928 (69%)

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 largest amount of data (in units of MB per second) that can be transported past the external memory interface within a second. It is calculated by multiplying the interface width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 number is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called 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, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.