Geforce GTX 670 vs Radeon HD 4850 2GB

Intro

Compare all of that to the Radeon HD 4850 2GB, which has a GPU core clock speed of 625 MHz, and 2048 MB of GDDR4 RAM set to run at 993 MHz through a 256-bit bus. It also is made up of 800(160x5) Stream Processors, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4850 2GB		110 Watts
Geforce GTX 670		170 Watts
	Difference: 60 Watts (55%)

Memory Bandwidth

Theoretically speaking, the Geforce GTX 670 should be 202% quicker than the Radeon HD 4850 2GB in general, because of its higher data rate. (explain)

Geforce GTX 670		192000 MB/sec
Radeon HD 4850 2GB		63552 MB/sec
	Difference: 128448 (202%)

Texel Rate

The Geforce GTX 670 should be a lot (approximately 310%) more effective at AF than the Radeon HD 4850 2GB. (explain)

Geforce GTX 670		102480 Mtexels/sec
Radeon HD 4850 2GB		25000 Mtexels/sec
	Difference: 77480 (310%)

Pixel Rate

The Geforce GTX 670 should be much (about 193%) more effective at FSAA than the Radeon HD 4850 2GB, and able to handle higher screen resolutions without slowing down too much. (explain)

Geforce GTX 670		29280 Mpixels/sec
Radeon HD 4850 2GB		10000 Mpixels/sec
	Difference: 19280 (193%)

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 max amount of data (measured in megabytes per second) that can be transported past the external memory interface within a second. It's calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better 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 applied per second. This is worked out by multiplying the total number of texture units of the card 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 processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.