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GeForce GTX 275 vs Radeon HD 4850 X2 1GB

Intro

The GeForce GTX 275 features clock speeds of 633 MHz on the GPU, and 1134 MHz on the 896 MB of GDDR3 memory. It features 240 SPUs along with 80 Texture Address Units and 28 ROPs.

Compare those specifications to the Radeon HD 4850 X2 1GB, which makes use of a 55 nm design. AMD has set the core speed at 625 MHz. The GDDR3 memory is set to run at a speed of 993 MHz on this specific card. It features 800(160x5) SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 275		219 Watts
Radeon HD 4850 X2 1GB		250 Watts
	Difference: 31 Watts (14%)

Memory Bandwidth

In theory, the Radeon HD 4850 X2 1GB is 0% faster than the GeForce GTX 275 overall, due to its higher bandwidth. (explain)

Radeon HD 4850 X2 1GB		127104 MB/sec
GeForce GTX 275		127008 MB/sec
	Difference: 96 (0%)

Texel Rate

The GeForce GTX 275 is a small bit (more or less 1%) faster with regards to AF than the Radeon HD 4850 X2 1GB. (explain)

GeForce GTX 275		50640 Mtexels/sec
Radeon HD 4850 X2 1GB		50000 Mtexels/sec
	Difference: 640 (1%)

Pixel Rate

The Radeon HD 4850 X2 1GB is a bit (more or less 13%) faster with regards to FSAA than the GeForce GTX 275, and able to handle higher screen resolutions better. (explain)

Radeon HD 4850 X2 1GB		20000 Mpixels/sec
GeForce GTX 275		17724 Mpixels/sec
	Difference: 2276 (13%)

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

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GeForce GTX 275

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Radeon HD 4850 X2 1GB

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Specifications

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Model	GeForce GTX 275	Radeon HD 4850 X2 1GB
Manufacturer	nVidia	AMD
Year	April 9, 2009	Nov 7, 2008
Code Name	G200b	R700
Memory	896 MB	1024 MB (x2)
Core Speed	633 MHz	625 MHz (x2)
Memory Speed	2268 MHz	1986 MHz (x2)
Power (Max TDP)	219 watts	250 watts
Bandwidth	127008 MB/sec	127104 MB/sec
Texel Rate	50640 Mtexels/sec	50000 Mtexels/sec
Pixel Rate	17724 Mpixels/sec	20000 Mpixels/sec
Unified Shaders	240	800(160x5) (x2)
Texture Mapping Units	80	40 (x2)
Render Output Units	28	16 (x2)
Bus Type	GDDR3	GDDR3
Bus Width	448-bit	256-bit (x2)
Fab Process	55 nm	55 nm
Transistors	1400 million	956 million
Bus	PCIe x16 2.0	PCIe 2.0 x16 (PCIe bridge)
DirectX Version	DirectX 10	DirectX 10.1
OpenGL Version	OpenGL 3.1	OpenGL 3.0

Memory Bandwidth: Bandwidth is the maximum amount of information (measured in MB per second) that can be moved over the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, 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 number of texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the graphics 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 most pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

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