GeForce GTX 650 vs Radeon HD 4850 512MB

Intro

Compare those specs to the Radeon HD 4850 512MB, which has core clock speeds of 625 MHz on the GPU, and 993 MHz on the 512 MB of GDDR3 RAM. It features 800(160x5) SPUs along with 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 512MB		110 Watts
	Difference: 46 Watts (72%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 650 should theoretically be a lot better than the Radeon HD 4850 512MB overall. (explain)

GeForce GTX 650		80000 MB/sec
Radeon HD 4850 512MB		63552 MB/sec
	Difference: 16448 (26%)

Texel Rate

The GeForce GTX 650 should be a lot (about 35%) better at texture filtering than the Radeon HD 4850 512MB. (explain)

GeForce GTX 650		33856 Mtexels/sec
Radeon HD 4850 512MB		25000 Mtexels/sec
	Difference: 8856 (35%)

Pixel Rate

The GeForce GTX 650 is a lot (approximately 69%) more effective at AA than the Radeon HD 4850 512MB, and capable of handling higher resolutions better. (explain)

GeForce GTX 650		16928 Mpixels/sec
Radeon HD 4850 512MB		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 max amount of information (measured in MB per second) that can be transported across the external memory interface in one second. It's calculated by multiplying the card's interface width by its memory speed. If the card has DDR RAM, it should 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, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card 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 ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka 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 - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.