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GeForce GT 240 GDDR5 vs Radeon HD 4850 X2 1GB


Intro

The GeForce GT 240 GDDR5 makes use of a 40 nm design. nVidia has clocked the core speed at 550 MHz. The GDDR5 memory is set to run at a speed of 850 MHz on this model. It features 96 SPUs as well as 32 TAUs and 8 ROPs.

Compare all of that to the Radeon HD 4850 X2 1GB, which features core speeds of 625 MHz on the GPU, and 993 MHz on the 1024 MB of GDDR3 memory. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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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

The Radeon HD 4850 X2 1GB, in theory, should be quite a bit faster than the GeForce GT 240 GDDR5 overall. (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 should be much (about 184%) better at 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 quite a bit (approximately 355%) more effective at full screen anti-aliasing than the GeForce GT 240 GDDR5, and will be able to handle higher screen resolutions without slowing down too much. (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

Radeon HD 4850 X2 1GB

Specifications

Display Specifications

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Model GeForce GT 240 GDDR5 Radeon HD 4850 X2 1GB
Manufacturer nVidia AMD
Year Novermber 2009 Nov 7, 2008
Code Name GT215 R700
Memory 512 MB 1024 MB (x2)
Core Speed 550 MHz 625 MHz (x2)
Memory Speed 3400 MHz 1986 MHz (x2)
Power (Max TDP) 70 watts 250 watts
Bandwidth 54400 MB/sec 127104 MB/sec
Texel Rate 17600 Mtexels/sec 50000 Mtexels/sec
Pixel Rate 4400 Mpixels/sec 20000 Mpixels/sec
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)
Fab Process 40 nm 55 nm
Transistors 289 million 956 million
Bus PCIe x16 PCIe 2.0 x16 (PCIe bridge)
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.2 OpenGL 3.0

Memory Bandwidth: Bandwidth is the max amount of data (in units of MB per second) that can be transported across the external memory interface in a second. The number is calculated by multiplying the bus width by its memory clock speed. In the case of DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This figure is worked out by multiplying the total texture units of the card by the core speed of the chip. The higher this number, the better the graphics 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 record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

GeForce GT 240 GDDR5

Radeon HD 4850 X2 1GB

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