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GeForce GT 240 GDDR5 vs Radeon HD 4850 X2 1GB

Intro

The GeForce GT 240 GDDR5 uses a 40 nm design. nVidia has set the core frequency at 550 MHz. The GDDR5 RAM is set to run at a speed of 850 MHz on this card. It features 96 SPUs as well as 32 TAUs and 8 Rasterization Operator Units.

Compare all of that to the Radeon HD 4850 X2 1GB, which uses a 55 nm design. AMD has set the core speed at 625 MHz. The GDDR3 memory runs at a frequency of 993 MHz on this specific model. It features 800(160x5) SPUs along with 40 TAUs and 16 ROPs.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 240 GDDR5 70 Watts
Radeon HD 4850 X2 1GB 250 Watts
Difference: 180 Watts (257%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4850 X2 1GB will be 134% faster than the GeForce GT 240 GDDR5 in general, because of its higher data rate. (explain)

Radeon HD 4850 X2 1GB 127104 MB/sec
GeForce GT 240 GDDR5 54400 MB/sec
Difference: 72704 (134%)

Texel Rate

The Radeon HD 4850 X2 1GB is a lot (approximately 184%) faster with regards to AF than the GeForce GT 240 GDDR5. (explain)

Radeon HD 4850 X2 1GB 50000 Mtexels/sec
GeForce GT 240 GDDR5 17600 Mtexels/sec
Difference: 32400 (184%)

Pixel Rate

The Radeon HD 4850 X2 1GB will be much (about 355%) faster with regards to anti-aliasing than the GeForce GT 240 GDDR5, and also will be capable of handling higher resolutions more effectively. (explain)

Radeon HD 4850 X2 1GB 20000 Mpixels/sec
GeForce GT 240 GDDR5 4400 Mpixels/sec
Difference: 15600 (355%)

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

GeForce GT 240 GDDR5

Amazon.com

Radeon HD 4850 X2 1GB

Amazon.com

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

Model GeForce GT 240 GDDR5 Radeon HD 4850 X2 1GB
Manufacturer nVidia AMD
Year Novermber 2009 Nov 7, 2008
Code Name GT215 R700
Fab Process 40 nm 55 nm
Bus PCIe x16 PCIe 2.0 x16 (PCIe bridge)
Memory 512 MB 1024 MB (x2)
Core Speed 550 MHz 625 MHz (x2)
Shader Speed 1360 MHz (N/A) MHz (x2)
Memory Speed 850 MHz (3400 MHz effective) 993 MHz (1986 MHz effective) (x2)
Unified Shaders 96 800(160x5) (x2)
Texture Mapping Units 32 40 (x2)
Render Output Units 8 16 (x2)
Bus Type GDDR5 GDDR3
Bus Width 128-bit 256-bit (x2)
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.2 OpenGL 3.0
Power (Max TDP) 70 watts 250 watts
Shader Model 4.1 4.1
Bandwidth 54400 MB/sec 127104 MB/sec
Texel Rate 17600 Mtexels/sec 50000 Mtexels/sec
Pixel Rate 4400 Mpixels/sec 20000 Mpixels/sec

Memory Bandwidth: Bandwidth is the maximum amount of information (counted in MB per second) that can be transported across the external memory interface within a second. It is calculated by multiplying the interface width by its memory speed. If it uses DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

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