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GeForce GTX 650 vs Radeon HD 3870 X2 1GB

Intro

The GeForce GTX 650 features a clock frequency of 1058 MHz and a GDDR5 memory speed of 1250 MHz. It also features a 128-bit bus, and makes use of a 28 nm design. It is made up of 384 SPUs, 32 TAUs, and 16 ROPs.

Compare all of that to the Radeon HD 3870 X2 1GB, which features GPU clock speed of 825 MHz, and 1024 MB of GDDR4 memory set to run at 1126 MHz through a 256-bit bus. It also is comprised of 320(64x5) SPUs, 16 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 3870 X2 1GB should be 80% quicker than the GeForce GTX 650 overall, because of its higher bandwidth. (explain)

Radeon HD 3870 X2 1GB 144128 MB/sec
GeForce GTX 650 80000 MB/sec
Difference: 64128 (80%)

Texel Rate

The GeForce GTX 650 should be much (more or less 28%) better at texture filtering than the Radeon HD 3870 X2 1GB. (explain)

GeForce GTX 650 33856 Mtexels/sec
Radeon HD 3870 X2 1GB 26400 Mtexels/sec
Difference: 7456 (28%)

Pixel Rate

The Radeon HD 3870 X2 1GB is a lot (about 56%) more effective at full screen anti-aliasing than the GeForce GTX 650, and able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 3870 X2 1GB 26400 Mpixels/sec
GeForce GTX 650 16928 Mpixels/sec
Difference: 9472 (56%)

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

Amazon.com

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Radeon HD 3870 X2 1GB

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 GTX 650 Radeon HD 3870 X2 1GB
Manufacturer nVidia AMD
Year September 2012 Jan 28, 2008
Code Name GK107 R680
Memory 1024 MB 1024 MB (x2)
Core Speed 1058 MHz 825 MHz (x2)
Memory Speed 5000 MHz 2252 MHz (x2)
Power (Max TDP) 64 watts (Unknown) watts
Bandwidth 80000 MB/sec 144128 MB/sec
Texel Rate 33856 Mtexels/sec 26400 Mtexels/sec
Pixel Rate 16928 Mpixels/sec 26400 Mpixels/sec
Unified Shaders 384 320(64x5) (x2)
Texture Mapping Units 32 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 1300 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: Memory bandwidth is the max amount of data (in units of MB per second) that can be moved past the external memory interface within a second. The number is worked out by multiplying the interface width by its memory clock speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

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

Display Prices

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GeForce GTX 650

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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