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GeForce GT 340 1GB vs Radeon HD 4850 X2 1GB

Intro

The GeForce GT 340 1GB features a GPU core speed of 550 MHz, and the 1024 MB of GDDR5 RAM is set to run at 850 MHz through a 128-bit bus. It also features 96 Stream Processors, 32 Texture Address Units, and 8 Raster Operation Units.

Compare that to the Radeon HD 4850 X2 1GB, which has a clock speed of 625 MHz and a GDDR3 memory speed of 993 MHz. It also features a 256-bit memory bus, and makes use of a 55 nm design. It is comprised of 800(160x5) SPUs, 40 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 340 1GB 69 Watts
Radeon HD 4850 X2 1GB 250 Watts
Difference: 181 Watts (262%)

Memory Bandwidth

Performance-wise, the Radeon HD 4850 X2 1GB should in theory be much better than the GeForce GT 340 1GB overall. (explain)

Radeon HD 4850 X2 1GB 127104 MB/sec
GeForce GT 340 1GB 54400 MB/sec
Difference: 72704 (134%)

Texel Rate

The Radeon HD 4850 X2 1GB will be quite a bit (approximately 184%) better at anisotropic filtering than the GeForce GT 340 1GB. (explain)

Radeon HD 4850 X2 1GB 50000 Mtexels/sec
GeForce GT 340 1GB 17600 Mtexels/sec
Difference: 32400 (184%)

Pixel Rate

The Radeon HD 4850 X2 1GB should be much (about 355%) better at FSAA than the GeForce GT 340 1GB, and also capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 4850 X2 1GB 20000 Mpixels/sec
GeForce GT 340 1GB 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

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GeForce GT 340 1GB

Amazon.com

Check prices at:

Radeon HD 4850 X2 1GB

Amazon.com

Check prices at:

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

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Model GeForce GT 340 1GB Radeon HD 4850 X2 1GB
Manufacturer nVidia AMD
Year February 2010 Nov 7, 2008
Code Name GT215 R700
Memory 1024 MB 1024 MB (x2)
Core Speed 550 MHz 625 MHz (x2)
Memory Speed 3400 MHz 1986 MHz (x2)
Power (Max TDP) 69 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 727 million 956 million
Bus PCIe x16 PCIe 2.0 x16 (PCIe bridge)
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.3 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the maximum amount of information (in units of MB per second) that can be transferred across the external memory interface in a second. It is calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, 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 amount of texture map elements (texels) that can be processed per second. This is worked out by multiplying the total texture units by the core speed of the chip. The better 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 maximum number of pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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GeForce GT 340 1GB

Amazon.com

Check prices at:

Radeon HD 4850 X2 1GB

Amazon.com

Check prices at:

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.

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