GeForce GT 240 GDDR5 1GB vs Radeon HD 4850 2GB

Intro

Compare those specifications to the Radeon HD 4850 2GB, which features core clock speeds of 625 MHz on the GPU, and 993 MHz on the 2048 MB of GDDR4 memory. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 240 GDDR5 1GB		70 Watts
Radeon HD 4850 2GB		110 Watts
	Difference: 40 Watts (57%)

Memory Bandwidth

Theoretically, the Radeon HD 4850 2GB should perform a little bit faster than the GeForce GT 240 GDDR5 1GB overall. (explain)

Radeon HD 4850 2GB		63552 MB/sec
GeForce GT 240 GDDR5 1GB		54400 MB/sec
	Difference: 9152 (17%)

Texel Rate

The Radeon HD 4850 2GB will be quite a bit (about 42%) more effective at texture filtering than the GeForce GT 240 GDDR5 1GB. (explain)

Radeon HD 4850 2GB		25000 Mtexels/sec
GeForce GT 240 GDDR5 1GB		17600 Mtexels/sec
	Difference: 7400 (42%)

Pixel Rate

The Radeon HD 4850 2GB will be a lot (approximately 127%) more effective at full screen anti-aliasing than the GeForce GT 240 GDDR5 1GB, and also will be capable of handling higher resolutions more effectively. (explain)

Radeon HD 4850 2GB		10000 Mpixels/sec
GeForce GT 240 GDDR5 1GB		4400 Mpixels/sec
	Difference: 5600 (127%)

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 MB per second) that can be transported over the external memory interface within a second. It's worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 amount of texture map elements (texels) that are processed per second. This is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher this number, the better the video card will be at handling 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 the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.