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GeForce GTX 650 vs Radeon HD 3870 1GB

Intro

The GeForce GTX 650 comes with a GPU core clock speed of 1058 MHz, and the 1024 MB of GDDR5 RAM is set to run at 1250 MHz through a 128-bit bus. It also is comprised of 384 Stream Processors, 32 TAUs, and 16 ROPs.

Compare those specs to the Radeon HD 3870 1GB, which has a clock speed of 775 MHz and a GDDR4 memory speed of 1125 MHz. It also features a 256-bit bus, and makes use of a 55 nm design. It is made up of 320(64x5) SPUs, 16 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650 64 Watts
Radeon HD 3870 1GB 106 Watts
Difference: 42 Watts (66%)

Memory Bandwidth

The GeForce GTX 650 should theoretically perform a little bit faster than the Radeon HD 3870 1GB overall. (explain)

GeForce GTX 650 80000 MB/sec
Radeon HD 3870 1GB 72000 MB/sec
Difference: 8000 (11%)

Texel Rate

The GeForce GTX 650 will be much (more or less 173%) faster with regards to anisotropic filtering than the Radeon HD 3870 1GB. (explain)

GeForce GTX 650 33856 Mtexels/sec
Radeon HD 3870 1GB 12400 Mtexels/sec
Difference: 21456 (173%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce GTX 650 is the winner, by a large margin. (explain)

GeForce GTX 650 16928 Mpixels/sec
Radeon HD 3870 1GB 12400 Mpixels/sec
Difference: 4528 (37%)

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 GTX 650

Amazon.com

Check prices at:

Radeon HD 3870 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 Radeon HD 3870 1GB
Manufacturer nVidia AMD
Year September 2012 Nov 19, 2007
Code Name GK107 RV670 XT
Memory 1024 MB 1024 MB
Core Speed 1058 MHz 775 MHz
Memory Speed 5000 MHz 2250 MHz
Power (Max TDP) 64 watts 106 watts
Bandwidth 80000 MB/sec 72000 MB/sec
Texel Rate 33856 Mtexels/sec 12400 Mtexels/sec
Pixel Rate 16928 Mpixels/sec 12400 Mpixels/sec
Unified Shaders 384 320(64x5)
Texture Mapping Units 32 16
Render Output Units 16 16
Bus Type GDDR5 GDDR4
Bus Width 128-bit 256-bit
Fab Process 28 nm 55 nm
Transistors 1300 million (Unknown) million
Bus PCIe 3.0 x16 PCIe 2.0 x16/AGP 8x
DirectX Version DirectX 11.0 DirectX 10.1
OpenGL Version OpenGL 4.3 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 in one second. The number is calculated by multiplying the bus width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 texture map elements (texels) that are processed per second. This is calculated by multiplying the total number of texture units by the core 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 applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video 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 number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

Hide Prices

GeForce GTX 650

Amazon.com

Check prices at:

Radeon HD 3870 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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