GeForce GTX 750 Ti vs Radeon HD 4850 2GB

Intro

Compare all that to the Radeon HD 4850 2GB, which has a core clock frequency of 625 MHz and a GDDR4 memory frequency of 993 MHz. It also uses a 256-bit memory bus, and makes use of a 55 nm design. It features 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 750 Ti		60 Watts
Radeon HD 4850 2GB		110 Watts
	Difference: 50 Watts (83%)

Memory Bandwidth

In theory, the GeForce GTX 750 Ti will be 36% quicker than the Radeon HD 4850 2GB overall, because of its higher bandwidth. (explain)

GeForce GTX 750 Ti		86400 MB/sec
Radeon HD 4850 2GB		63552 MB/sec
	Difference: 22848 (36%)

Texel Rate

The GeForce GTX 750 Ti is much (more or less 63%) better at texture filtering than the Radeon HD 4850 2GB. (explain)

GeForce GTX 750 Ti		40800 Mtexels/sec
Radeon HD 4850 2GB		25000 Mtexels/sec
	Difference: 15800 (63%)

Pixel Rate

The GeForce GTX 750 Ti is quite a bit (about 63%) better at full screen anti-aliasing than the Radeon HD 4850 2GB, and also should be able to handle higher resolutions without slowing down too much. (explain)

GeForce GTX 750 Ti		16320 Mpixels/sec
Radeon HD 4850 2GB		10000 Mpixels/sec
	Difference: 6320 (63%)

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 megabytes per second) that can be transferred over the external memory interface within a second. It's calculated by multiplying the bus width by its memory speed. If it uses DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total number of texture units of the card by the core 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 applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.