GeForce GT 315 vs Radeon HD 7950

Intro

Compare those specs to the Radeon HD 7950, which features GPU clock speed of 800 MHz, and 1536 MB of GDDR5 RAM set to run at 1250 MHz through a 384-bit bus. It also features 1792 SPUs, 112 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 315		52 Watts
Radeon HD 7950		200 Watts
	Difference: 148 Watts (285%)

Memory Bandwidth

In theory, the Radeon HD 7950 should perform a lot faster than the GeForce GT 315 overall. (explain)

Radeon HD 7950		240000 MB/sec
GeForce GT 315		25280 MB/sec
	Difference: 214720 (849%)

Texel Rate

The Radeon HD 7950 should be quite a bit (approximately 796%) more effective at anisotropic filtering than the GeForce GT 315. (explain)

Radeon HD 7950		89600 Mtexels/sec
GeForce GT 315		10000 Mtexels/sec
	Difference: 79600 (796%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 7950 is a better choice, and very much so. (explain)

Radeon HD 7950		25600 Mpixels/sec
GeForce GT 315		5000 Mpixels/sec
	Difference: 20600 (412%)

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 (in units of megabytes per second) that can be moved past the external memory interface in one second. It's worked out by multiplying the interface width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better 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 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 in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.