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GeForce GTX 660 vs Radeon HD 7850

Intro

The GeForce GTX 660 has a GPU core speed of 980 MHz, and the 2048 MB of GDDR5 RAM is set to run at 1502 MHz through a 192-bit bus. It also is made up of 960 SPUs, 80 Texture Address Units, and 24 ROPs.

Compare all of that to the Radeon HD 7850, which features a clock speed of 860 MHz and a GDDR5 memory frequency of 1200 MHz. It also makes use of a 256-bit bus, and makes use of a 28 nm design. It is comprised of 1024 SPUs, 64 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7850 130 Watts
GeForce GTX 660 140 Watts
Difference: 10 Watts (8%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7850 should be 7% quicker than the GeForce GTX 660 overall, due to its greater data rate. (explain)

Radeon HD 7850 153600 MB/sec
GeForce GTX 660 144192 MB/sec
Difference: 9408 (7%)

Texel Rate

The GeForce GTX 660 will be quite a bit (approximately 42%) more effective at anisotropic filtering than the Radeon HD 7850. (explain)

GeForce GTX 660 78400 Mtexels/sec
Radeon HD 7850 55040 Mtexels/sec
Difference: 23360 (42%)

Pixel Rate

The Radeon HD 7850 should be a little bit (more or less 17%) better at anti-aliasing than the GeForce GTX 660, and also should be able to handle higher screen resolutions more effectively. (explain)

Radeon HD 7850 27520 Mpixels/sec
GeForce GTX 660 23520 Mpixels/sec
Difference: 4000 (17%)

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 660

Amazon.com

Radeon HD 7850

Amazon.com

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 7850
Manufacturer nVidia AMD
Year September 2012 March 2012
Code Name GK106 Pitcairn Pro
Memory 2048 MB 2048 MB
Core Speed 980 MHz 860 MHz
Memory Speed 6008 MHz 4800 MHz
Power (Max TDP) 140 watts 130 watts
Bandwidth 144192 MB/sec 153600 MB/sec
Texel Rate 78400 Mtexels/sec 55040 Mtexels/sec
Pixel Rate 23520 Mpixels/sec 27520 Mpixels/sec
Unified Shaders 960 1024
Texture Mapping Units 80 64
Render Output Units 24 32
Bus Type GDDR5 GDDR5
Bus Width 192-bit 256-bit
Fab Process 28 nm 28 nm
Transistors 2540 million 2800 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.0 DirectX 11.1
OpenGL Version OpenGL 4.3 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the max amount of data (in units of megabytes per second) that can be transported over the external memory interface in a second. It's calculated by multiplying the bus width by its memory clock speed. If the card has DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card could 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 ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Comments

16 Responses to “GeForce GTX 660 vs Radeon HD 7850”
Xshad0w says:

i have sapphire 7850 2gb oc but gtx 660 better

paratha says:

evga gtx660 is alot better than 7850.Gtx660 beat 7850 easily

Aero says:

I bought the GTX 660 for 1366x768, and easily touched 60fps at all games

Bangladeshi Ranjan says:

Bangladeshi Ranjan says:

Can anyone ans is texal rate so important?

burakgon says:

I have a 7850 OC. That's dumb. 660 is much and much better! Even for linux.

jim says:

660 or 7850 oc...

jovancecar says:

is amd better on 1680 X 1080

eng_borek says:

as an engineer i'd say all those tests are more or less biased.

from a sticktly technical point of view hd7850 should be a much more powerful card

it's not only about the gpu /memory clocks

hd 7850 is much more customizable and OC-efficient.

lewis says:

I have the 660 and my friend has the 7850, when we compared frames on games such as bf3 and wow (using same processor) the 660 came out on top by about 5 fps

Joshua A. says:

I think the saddest part about this benchmark is, AMD's 7850 is $100 cheaper.

Zhao says:

gtx 660 is in stock better than the 7850 in stock clock, but when it comes to overclocking, the 7850 has a little advantage overall. Still nvidia has physx built in :)

qadqe says:

me cago en tus muertos

Evans Young says:

i won the gtx 660 evga for the win signature 2 edition and its blazing fast.

RedDevil90 says:

Hi,im thinking on buying one of the two.And i just want to know which is better the gtx 660 or the 7850?

killermenpl says:

Which is better if I have AMD A10-5800k APU?

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