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GeForce GT 315 vs Radeon HD 4870 X2

Intro

The GeForce GT 315 uses a 40 nm design. nVidia has set the core speed at 625 MHz. The DDR3 memory runs at a speed of 790 MHz on this model. It features 48 SPUs as well as 16 TAUs and 8 Rasterization Operator Units.

Compare all of that to the Radeon HD 4870 X2, which makes use of a 55 nm design. AMD has set the core speed at 750 MHz. The GDDR5 RAM is set to run at a frequency of 900 MHz on this particular model. It features 800(160x5) SPUs as well as 40 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 315 52 Watts
Radeon HD 4870 X2 350 Watts
Difference: 298 Watts (573%)

Memory Bandwidth

The Radeon HD 4870 X2 should in theory perform much faster than the GeForce GT 315 overall. (explain)

Radeon HD 4870 X2 230400 MB/sec
GeForce GT 315 25280 MB/sec
Difference: 205120 (811%)

Texel Rate

The Radeon HD 4870 X2 is much (approximately 500%) better at texture filtering than the GeForce GT 315. (explain)

Radeon HD 4870 X2 60000 Mtexels/sec
GeForce GT 315 10000 Mtexels/sec
Difference: 50000 (500%)

Pixel Rate

The Radeon HD 4870 X2 will be quite a bit (approximately 380%) faster with regards to anti-aliasing than the GeForce GT 315, and also should be able to handle higher resolutions better. (explain)

Radeon HD 4870 X2 24000 Mpixels/sec
GeForce GT 315 5000 Mpixels/sec
Difference: 19000 (380%)

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 315

Amazon.com

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Radeon HD 4870 X2

Amazon.com

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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 315 Radeon HD 4870 X2
Manufacturer nVidia AMD
Year November 2009 Aug 12, 2008
Code Name GT216 R700
Memory 512 MB 1024 MB (x2)
Core Speed 625 MHz 750 MHz (x2)
Memory Speed 1580 MHz 3600 MHz (x2)
Power (Max TDP) 52 watts 350 watts
Bandwidth 25280 MB/sec 230400 MB/sec
Texel Rate 10000 Mtexels/sec 60000 Mtexels/sec
Pixel Rate 5000 Mpixels/sec 24000 Mpixels/sec
Unified Shaders 48 800(160x5) (x2)
Texture Mapping Units 16 40 (x2)
Render Output Units 8 16 (x2)
Bus Type DDR3 GDDR5
Bus Width 128-bit 256-bit (x2)
Fab Process 40 nm 55 nm
Transistors 486 million 956 million
Bus PCIe 2.0 PCIe 2.0 x16 (PCIe bridge)
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.2 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the maximum amount of data (measured in MB per second) that can be moved over the external memory interface within a second. It's calculated by multiplying the interface width by the speed of its memory. If it uses DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better 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 number of texture map elements (texels) that are applied per second. This is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, especially 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 315

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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