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GeForce GTX 650 Ti 2GB vs Radeon HD 3870 X2 1GB

Intro

The GeForce GTX 650 Ti 2GB comes with a clock speed of 928 MHz and a GDDR5 memory speed of 1350 MHz. It also makes use of a 128-bit memory bus, and uses a 28 nm design. It features 768 SPUs, 64 TAUs, and 16 ROPs.

Compare all of that to the Radeon HD 3870 X2 1GB, which makes use of a 55 nm design. AMD has set the core frequency at 825 MHz. The GDDR4 memory is set to run at a frequency of 1126 MHz on this card. It features 320(64x5) SPUs along with 16 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 3870 X2 1GB should in theory perform a lot faster than the GeForce GTX 650 Ti 2GB in general. (explain)

Radeon HD 3870 X2 1GB 144128 MB/sec
GeForce GTX 650 Ti 2GB 86400 MB/sec
Difference: 57728 (67%)

Texel Rate

The GeForce GTX 650 Ti 2GB should be much (more or less 125%) more effective at AF than the Radeon HD 3870 X2 1GB. (explain)

GeForce GTX 650 Ti 2GB 59392 Mtexels/sec
Radeon HD 3870 X2 1GB 26400 Mtexels/sec
Difference: 32992 (125%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 3870 X2 1GB is a better choice, by a large margin. (explain)

Radeon HD 3870 X2 1GB 26400 Mpixels/sec
GeForce GTX 650 Ti 2GB 14848 Mpixels/sec
Difference: 11552 (78%)

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 GTX 650 Ti 2GB

Amazon.com

Check prices at:

Radeon HD 3870 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 GTX 650 Ti 2GB Radeon HD 3870 X2 1GB
Manufacturer nVidia AMD
Year October 2012 Jan 28, 2008
Code Name GK106 R680
Memory 2048 MB 1024 MB (x2)
Core Speed 928 MHz 825 MHz (x2)
Memory Speed 5400 MHz 2252 MHz (x2)
Power (Max TDP) 110 watts (Unknown) watts
Bandwidth 86400 MB/sec 144128 MB/sec
Texel Rate 59392 Mtexels/sec 26400 Mtexels/sec
Pixel Rate 14848 Mpixels/sec 26400 Mpixels/sec
Unified Shaders 768 320(64x5) (x2)
Texture Mapping Units 64 16 (x2)
Render Output Units 16 16 (x2)
Bus Type GDDR5 GDDR4
Bus Width 128-bit 256-bit (x2)
Fab Process 28 nm 55 nm
Transistors 2540 million (Unknown) million
Bus PCIe 3.0 x16 PCIe 2.0 x16/(internal PCIe 1.1 x16)
DirectX Version DirectX 11.0 DirectX 10.1
OpenGL Version OpenGL 4.3 OpenGL 3.0

Memory Bandwidth: Bandwidth is the largest amount of data (counted in megabytes per second) that can be transferred across the external memory interface in a second. It's calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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GeForce GTX 650 Ti 2GB

Amazon.com

Check prices at:

Radeon HD 3870 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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