GeForce GT 315 vs Radeon HD 4650 1GB

Intro

Compare that to the Radeon HD 4650 1GB, which has GPU core speed of 600 MHz, and 1024 MB of GDDR3 RAM running at 700 MHz through a 128-bit bus. It also is comprised of 320(64x5) Stream Processors, 32 TAUs, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 315		52 Watts
Radeon HD 4650 1GB		55 Watts
	Difference: 3 Watts (6%)

Memory Bandwidth

The GeForce GT 315, in theory, should perform a small bit faster than the Radeon HD 4650 1GB in general. (explain)

GeForce GT 315		25280 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 2880 (13%)

Texel Rate

The Radeon HD 4650 1GB will be quite a bit (approximately 92%) better at AF than the GeForce GT 315. (explain)

Radeon HD 4650 1GB		19200 Mtexels/sec
GeForce GT 315		10000 Mtexels/sec
	Difference: 9200 (92%)

Pixel Rate

The GeForce GT 315 should be a small bit (more or less 4%) more effective at anti-aliasing than the Radeon HD 4650 1GB, and should be able to handle higher screen resolutions better. (explain)

GeForce GT 315		5000 Mpixels/sec
Radeon HD 4650 1GB		4800 Mpixels/sec
	Difference: 200 (4%)

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 (counted in MB per second) that can be transported across the external memory interface in one second. The number is calculated by multiplying the card's bus width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range 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 number is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.