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GeForce GT 315 vs Radeon HD 3650

Intro

The GeForce GT 315 has a clock frequency of 625 MHz and a DDR3 memory speed of 790 MHz. It also features a 128-bit memory bus, and makes use of a 40 nm design. It is comprised of 48 SPUs, 16 Texture Address Units, and 8 ROPs.

Compare all that to the Radeon HD 3650, which comes with a clock speed of 725 MHz and a GDDR4 memory speed of 800 MHz. It also makes use of a 128-bit bus, and uses a 55 nm design. It is made up of 120(24x5) SPUs, 8 Texture Address Units, and 4 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 315 52 Watts
Radeon HD 3650 78 Watts
Difference: 26 Watts (50%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 3650 should perform just a bit faster than the GeForce GT 315 overall. (explain)

Radeon HD 3650 25600 MB/sec
GeForce GT 315 25280 MB/sec
Difference: 320 (1%)

Texel Rate

The GeForce GT 315 will be a lot (approximately 72%) more effective at texture filtering than the Radeon HD 3650. (explain)

GeForce GT 315 10000 Mtexels/sec
Radeon HD 3650 5800 Mtexels/sec
Difference: 4200 (72%)

Pixel Rate

If using a high resolution is important to you, then the GeForce GT 315 is the winner, by a large margin. (explain)

GeForce GT 315 5000 Mpixels/sec
Radeon HD 3650 2900 Mpixels/sec
Difference: 2100 (72%)

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 3650

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 3650
Manufacturer nVidia AMD
Year November 2009 2008
Code Name GT216 RV635 PRO
Memory 512 MB 1024 MB
Core Speed 625 MHz 725 MHz
Memory Speed 1580 MHz 1600 MHz
Power (Max TDP) 52 watts 78 watts
Bandwidth 25280 MB/sec 25600 MB/sec
Texel Rate 10000 Mtexels/sec 5800 Mtexels/sec
Pixel Rate 5000 Mpixels/sec 2900 Mpixels/sec
Unified Shaders 48 120(24x5)
Texture Mapping Units 16 8
Render Output Units 8 4
Bus Type DDR3 GDDR4
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/AGP 8x
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.2 OpenGL 3.0

Memory Bandwidth: Bandwidth is the largest amount of information (counted in megabytes per second) that can be transferred across the external memory interface within a second. It's worked out by multiplying the bus width by its memory clock speed. If the card has DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed 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 better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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GeForce GT 315

Amazon.com

Check prices at:

Radeon HD 3650

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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