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GeForce GTX 650 vs Radeon HD 3870 1GB

Intro

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

Compare that to the Radeon HD 3870 1GB, which has a clock speed of 775 MHz and a GDDR4 memory speed of 1125 MHz. It also makes use of a 256-bit bus, and makes use of a 55 nm design. It is made up of 320(64x5) SPUs, 16 Texture Address Units, and 16 Raster Operation Units.

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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

As far as performance goes, the GeForce GTX 650 should theoretically be a small bit better 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 quite a bit (more or less 173%) faster with regards to texture 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

The GeForce GTX 650 will be quite a bit (more or less 37%) more effective at FSAA than the Radeon HD 3870 1GB, and also able to handle higher screen resolutions better. (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 maximum amount of data (measured in MB per second) that can be moved across the external memory interface in one second. It's worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the 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 texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total number of texture units by the core clock 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 most pixels the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum 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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