GeForce GTX 465 vs Radeon HD 4850 X2 1GB

Intro

Compare that to the Radeon HD 4850 X2 1GB, which comes with a clock speed of 625 MHz and a GDDR3 memory frequency of 993 MHz. It also features a 256-bit bus, and makes use of a 55 nm design. It is made up of 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 465		200 Watts
Radeon HD 4850 X2 1GB		250 Watts
	Difference: 50 Watts (25%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4850 X2 1GB is 24% faster than the GeForce GTX 465 overall, because of its greater data rate. (explain)

Radeon HD 4850 X2 1GB		127104 MB/sec
GeForce GTX 465		102592 MB/sec
	Difference: 24512 (24%)

Texel Rate

The Radeon HD 4850 X2 1GB is quite a bit (more or less 87%) more effective at texture filtering than the GeForce GTX 465. (explain)

Radeon HD 4850 X2 1GB		50000 Mtexels/sec
GeForce GTX 465		26708 Mtexels/sec
	Difference: 23292 (87%)

Pixel Rate

The Radeon HD 4850 X2 1GB will be a small bit (approximately 3%) faster with regards to full screen anti-aliasing than the GeForce GTX 465, and also capable of handling higher screen resolutions better. (explain)

Radeon HD 4850 X2 1GB		20000 Mpixels/sec
GeForce GTX 465		19424 Mpixels/sec
	Difference: 576 (3%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the maximum amount of data (measured in megabytes per second) that can be transferred across the external memory interface within a second. It's worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.