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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 clocked the core frequency at 550 MHz. The GDDR5 memory is set to run at a frequency of 850 MHz on this specific card. It features 96 SPUs as well as 32 TAUs and 8 ROPs.

Compare all of that to the Radeon HD 4850 X2 1GB, which makes use of a 55 nm design. AMD has set the core frequency at 625 MHz. The GDDR3 RAM is set to run at a frequency of 993 MHz on this specific model. It features 800(160x5) SPUs along with 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

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(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

As far as performance goes, the Radeon HD 4850 X2 1GB should in theory be quite a bit superior to 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 is quite a bit (more or less 184%) more effective at anisotropic filtering 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

If running with lots of anti-aliasing is important to you, then the Radeon HD 4850 X2 1GB is a better choice, by far. (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

Display Prices

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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

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
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: Memory bandwidth is the largest amount of data (counted in MB per second) that can be transferred across the external memory interface in one second. The number is calculated by multiplying the bus width by the speed of its memory. If the card has DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster 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 number of texture map elements (texels) that can be applied per second. This is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

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