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GeForce GT 320 vs Radeon HD 4870 X2

Intro

The GeForce GT 320 has a GPU core speed of 540 MHz, and the 1024 MB of GDDR3 memory runs at 790 MHz through a 128-bit bus. It also is comprised of 72 Stream Processors, 24 TAUs, and 8 ROPs.

Compare those specifications to the Radeon HD 4870 X2, which has a GPU core clock speed of 750 MHz, and 1024 MB of GDDR5 memory set to run at 900 MHz through a 256-bit bus. It also is comprised of 800(160x5) Stream Processors, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 320 43 Watts
Radeon HD 4870 X2 350 Watts
Difference: 307 Watts (714%)

Memory Bandwidth

The Radeon HD 4870 X2, in theory, should perform quite a bit faster than the GeForce GT 320 in general. (explain)

Radeon HD 4870 X2 230400 MB/sec
GeForce GT 320 25280 MB/sec
Difference: 205120 (811%)

Texel Rate

The Radeon HD 4870 X2 will be much (approximately 363%) more effective at AF than the GeForce GT 320. (explain)

Radeon HD 4870 X2 60000 Mtexels/sec
GeForce GT 320 12960 Mtexels/sec
Difference: 47040 (363%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 4870 X2 is superior to the GeForce GT 320, by far. (explain)

Radeon HD 4870 X2 24000 Mpixels/sec
GeForce GT 320 4320 Mpixels/sec
Difference: 19680 (456%)

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 320

Amazon.com

Check prices at:

Radeon HD 4870 X2

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 320 Radeon HD 4870 X2
Manufacturer nVidia AMD
Year February 2010 Aug 12, 2008
Code Name GT215 R700
Memory 1024 MB 1024 MB (x2)
Core Speed 540 MHz 750 MHz (x2)
Memory Speed 1580 MHz 3600 MHz (x2)
Power (Max TDP) 43 watts 350 watts
Bandwidth 25280 MB/sec 230400 MB/sec
Texel Rate 12960 Mtexels/sec 60000 Mtexels/sec
Pixel Rate 4320 Mpixels/sec 24000 Mpixels/sec
Unified Shaders 72 800(160x5) (x2)
Texture Mapping Units 24 40 (x2)
Render Output Units 8 16 (x2)
Bus Type GDDR3 GDDR5
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: Bandwidth is the largest amount of data (measured in MB per second) that can be transported over the external memory interface in a second. It is worked out by multiplying the bus width by its memory speed. If the card has DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. 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 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 higher this number, the better the 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 that the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). 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 ability to get to the maximum fill rate.

Display Prices

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GeForce GT 320

Amazon.com

Check prices at:

Radeon HD 4870 X2

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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