GeForce GT 315 vs Radeon HD 4650 1GB

Intro

Compare those specifications to the Radeon HD 4650 1GB, which uses a 55 nm design. AMD has clocked the core frequency at 600 MHz. The GDDR3 RAM works at a speed of 700 MHz on this model. It features 320(64x5) SPUs along with 32 Texture Address Units 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

In theory, the GeForce GT 315 will be 13% quicker than the Radeon HD 4650 1GB overall, due to its greater data rate. (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 a lot (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

If using lots of anti-aliasing is important to you, then the GeForce GT 315 is the winner, not by a very large margin though. (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: Bandwidth is the maximum amount of information (counted in megabytes per second) that can be transferred 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 the card has DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better 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 are applied in one second. This number is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the card will be at handling 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 can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant 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 maximum fill rate.