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GeForce GT 315 vs Radeon HD 3690/3830

Intro

The GeForce GT 315 has a GPU clock speed of 625 MHz, and the 512 MB of DDR3 memory is set to run at 790 MHz through a 128-bit bus. It also is comprised of 48 SPUs, 16 TAUs, and 8 Raster Operation Units.

Compare all of that to the Radeon HD 3690/3830, which features core clock speeds of 668 MHz on the GPU, and 828 MHz on the 256 MB of GDDR3 RAM. It features 320(64x5) SPUs as well as 16 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 315 52 Watts
Radeon HD 3690/3830 75 Watts
Difference: 23 Watts (44%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 3690/3830 should be 5% faster than the GeForce GT 315 in general, because of its higher data rate. (explain)

Radeon HD 3690/3830 26496 MB/sec
GeForce GT 315 25280 MB/sec
Difference: 1216 (5%)

Texel Rate

The Radeon HD 3690/3830 is a little bit (approximately 7%) faster with regards to texture filtering than the GeForce GT 315. (explain)

Radeon HD 3690/3830 10688 Mtexels/sec
GeForce GT 315 10000 Mtexels/sec
Difference: 688 (7%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 3690/3830 is the winner, by a large margin. (explain)

Radeon HD 3690/3830 10688 Mpixels/sec
GeForce GT 315 5000 Mpixels/sec
Difference: 5688 (114%)

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.

Price Comparison

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GeForce GT 315

Amazon.com

Check prices at:

Radeon HD 3690/3830

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 315 Radeon HD 3690/3830
Manufacturer nVidia AMD
Year November 2009 2008
Code Name GT216 RV670 PRO
Memory 512 MB 256 MB
Core Speed 625 MHz 668 MHz
Memory Speed 1580 MHz 1656 MHz
Power (Max TDP) 52 watts 75 watts
Bandwidth 25280 MB/sec 26496 MB/sec
Texel Rate 10000 Mtexels/sec 10688 Mtexels/sec
Pixel Rate 5000 Mpixels/sec 10688 Mpixels/sec
Unified Shaders 48 320(64x5)
Texture Mapping Units 16 16
Render Output Units 8 16
Bus Type DDR3 GDDR3
Bus Width 128-bit 128-bit
Fab Process 40 nm 55 nm
Transistors 486 million (Unknown) million
Bus PCIe 2.0 PCIe 2.0 x16
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.2 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the largest amount of data (counted in MB per second) that can be moved over the external memory interface in one second. The number is calculated by multiplying the interface width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This figure is worked out by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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GeForce GT 315

Amazon.com

Check prices at:

Radeon HD 3690/3830

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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