GeForce GTX 465 vs Radeon HD 4870 2GB

Intro

Compare those specifications to the Radeon HD 4870 2GB, which comes with GPU core speed of 750 MHz, and 2048 MB of GDDR5 RAM running at 900 MHz through a 256-bit bus. It also is made up of 800(160x5) Stream Processors, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4870 2GB		150 Watts
GeForce GTX 465		200 Watts
	Difference: 50 Watts (33%)

Memory Bandwidth

In theory, the Radeon HD 4870 2GB will be 12% faster than the GeForce GTX 465 overall, due to its greater data rate. (explain)

Radeon HD 4870 2GB		115200 MB/sec
GeForce GTX 465		102592 MB/sec
	Difference: 12608 (12%)

Texel Rate

The Radeon HD 4870 2GB will be a small bit (more or less 12%) faster with regards to texture filtering than the GeForce GTX 465. (explain)

Radeon HD 4870 2GB		30000 Mtexels/sec
GeForce GTX 465		26708 Mtexels/sec
	Difference: 3292 (12%)

Pixel Rate

The GeForce GTX 465 will be much (about 62%) better at AA than the Radeon HD 4870 2GB, and also able to handle higher resolutions better. (explain)

GeForce GTX 465		19424 Mpixels/sec
Radeon HD 4870 2GB		12000 Mpixels/sec
	Difference: 7424 (62%)

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 information (counted in MB per second) that can be transported across the external memory interface in a second. It's calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better 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 worked out by multiplying the total amount of texture units by the core speed of the chip. The higher the texel rate, 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 the graphics card 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 colour ROPs 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 fill rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.