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GeForce GTX 660 vs Radeon HD 4850 X2 1GB

Intro

The GeForce GTX 660 uses a 28 nm design. nVidia has clocked the core speed at 980 MHz. The GDDR5 memory runs at a speed of 1502 MHz on this specific card. It features 960 SPUs as well as 80 TAUs and 24 ROPs.

Compare those specs to the Radeon HD 4850 X2 1GB, which has core clock speeds of 625 MHz on the GPU, and 993 MHz on the 1024 MB of GDDR3 memory. It features 800(160x5) SPUs as well as 40 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660 140 Watts
Radeon HD 4850 X2 1GB 250 Watts
Difference: 110 Watts (79%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 660 should in theory be a small bit better than the Radeon HD 4850 X2 1GB in general. (explain)

GeForce GTX 660 144192 MB/sec
Radeon HD 4850 X2 1GB 127104 MB/sec
Difference: 17088 (13%)

Texel Rate

The GeForce GTX 660 should be quite a bit (more or less 57%) faster with regards to texture filtering than the Radeon HD 4850 X2 1GB. (explain)

GeForce GTX 660 78400 Mtexels/sec
Radeon HD 4850 X2 1GB 50000 Mtexels/sec
Difference: 28400 (57%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce GTX 660 is the winner, not by a very large margin though. (explain)

GeForce GTX 660 23520 Mpixels/sec
Radeon HD 4850 X2 1GB 20000 Mpixels/sec
Difference: 3520 (18%)

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 660

Amazon.com

Check prices at:

Radeon HD 4850 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 660 Radeon HD 4850 X2 1GB
Manufacturer nVidia AMD
Year September 2012 Nov 7, 2008
Code Name GK106 R700
Memory 2048 MB 1024 MB (x2)
Core Speed 980 MHz 625 MHz (x2)
Memory Speed 6008 MHz 1986 MHz (x2)
Power (Max TDP) 140 watts 250 watts
Bandwidth 144192 MB/sec 127104 MB/sec
Texel Rate 78400 Mtexels/sec 50000 Mtexels/sec
Pixel Rate 23520 Mpixels/sec 20000 Mpixels/sec
Unified Shaders 960 800(160x5) (x2)
Texture Mapping Units 80 40 (x2)
Render Output Units 24 16 (x2)
Bus Type GDDR5 GDDR3
Bus Width 192-bit 256-bit (x2)
Fab Process 28 nm 55 nm
Transistors 2540 million 956 million
Bus PCIe 3.0 x16 PCIe 2.0 x16 (PCIe bridge)
DirectX Version DirectX 11.0 DirectX 10.1
OpenGL Version OpenGL 4.3 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the largest amount of data (in units of megabytes per second) that can be moved past the external memory interface in a second. It's worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

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GeForce GTX 660

Amazon.com

Check prices at:

Radeon HD 4850 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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