GeForce GTX 560 Ti 448 vs Radeon HD 4850 2GB

Intro

Compare those specs to the Radeon HD 4850 2GB, which comes with a core clock frequency of 625 MHz and a GDDR4 memory frequency of 993 MHz. It also features a 256-bit bus, and uses a 55 nm design. It is comprised of 800(160x5) SPUs, 40 Texture Address Units, 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 560 Ti 448		210 Watts
	Difference: 100 Watts (91%)

Memory Bandwidth

In theory, the GeForce GTX 560 Ti 448 should be 127% quicker than the Radeon HD 4850 2GB in general, because of its greater bandwidth. (explain)

GeForce GTX 560 Ti 448		144000 MB/sec
Radeon HD 4850 2GB		63552 MB/sec
	Difference: 80448 (127%)

Texel Rate

The GeForce GTX 560 Ti 448 is quite a bit (approximately 64%) faster with regards to AF than the Radeon HD 4850 2GB. (explain)

GeForce GTX 560 Ti 448		40992 Mtexels/sec
Radeon HD 4850 2GB		25000 Mtexels/sec
	Difference: 15992 (64%)

Pixel Rate

The GeForce GTX 560 Ti 448 should be a lot (approximately 193%) better at AA than the Radeon HD 4850 2GB, and will be capable of handling higher screen resolutions more effectively. (explain)

GeForce GTX 560 Ti 448		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: Memory bandwidth is the max amount of data (in units of megabytes per second) that can be transferred over the external memory interface in a second. It is worked out by multiplying the interface width by its memory speed. If the card has DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster 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 number of texture map elements (texels) that are applied in one second. This number is worked out by multiplying the total amount of texture units of the card by the core 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 in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.