GeForce GTX 465 vs Radeon HD 5870

Intro

Compare those specs to the Radeon HD 5870, which comes with a clock speed of 850 MHz and a GDDR5 memory speed of 1200 MHz. It also makes use of a 256-bit memory bus, and makes use of a 40 nm design. It features 1600(320x5) SPUs, 80 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5870		188 Watts
GeForce GTX 465		200 Watts
	Difference: 12 Watts (6%)

Memory Bandwidth

As far as performance goes, the Radeon HD 5870 should in theory be quite a bit superior to the GeForce GTX 465 overall. (explain)

Radeon HD 5870		153600 MB/sec
GeForce GTX 465		102592 MB/sec
	Difference: 51008 (50%)

Texel Rate

The Radeon HD 5870 will be a lot (about 155%) more effective at AF than the GeForce GTX 465. (explain)

Radeon HD 5870		68000 Mtexels/sec
GeForce GTX 465		26708 Mtexels/sec
	Difference: 41292 (155%)

Pixel Rate

The Radeon HD 5870 is a lot (more or less 40%) better at full screen anti-aliasing than the GeForce GTX 465, and also capable of handling higher resolutions without losing too much performance. (explain)

Radeon HD 5870		27200 Mpixels/sec
GeForce GTX 465		19424 Mpixels/sec
	Difference: 7776 (40%)

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 megabytes per second) that can be transported over the external memory interface in one second. It's calculated by multiplying the bus width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This 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 graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.