GeForce GT 240 GDDR5 vs Radeon HD 7850

Intro

Compare those specs to the Radeon HD 7850, which has GPU core speed of 860 MHz, and 2048 MB of GDDR5 RAM running at 1200 MHz through a 256-bit bus. It also is made up of 1024 SPUs, 64 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 240 GDDR5		70 Watts
Radeon HD 7850		130 Watts
	Difference: 60 Watts (86%)

Memory Bandwidth

The Radeon HD 7850, in theory, should perform quite a bit faster than the GeForce GT 240 GDDR5 overall. (explain)

Radeon HD 7850		153600 MB/sec
GeForce GT 240 GDDR5		54400 MB/sec
	Difference: 99200 (182%)

Texel Rate

The Radeon HD 7850 will be a lot (more or less 213%) more effective at texture filtering than the GeForce GT 240 GDDR5. (explain)

Radeon HD 7850		55040 Mtexels/sec
GeForce GT 240 GDDR5		17600 Mtexels/sec
	Difference: 37440 (213%)

Pixel Rate

The Radeon HD 7850 will be much (more or less 525%) faster with regards to FSAA than the GeForce GT 240 GDDR5, and also should be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 7850		27520 Mpixels/sec
GeForce GT 240 GDDR5		4400 Mpixels/sec
	Difference: 23120 (525%)

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 maximum amount of data (in units of MB per second) that can be transported over the external memory interface in one second. It is worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units 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 output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.