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Geforce GTX 670 vs Radeon HD 7850

Intro

The Geforce GTX 670 has a clock speed of 915 MHz and a GDDR5 memory speed of 1500 MHz. It also features a 256-bit bus, and makes use of a 28 nm design. It is comprised of 1344 SPUs, 112 Texture Address Units, and 32 Raster Operation Units.

Compare those specifications to the Radeon HD 7850, which has core clock speeds of 860 MHz on the GPU, and 1200 MHz on the 2048 MB of GDDR5 memory. It features 1024 SPUs along with 64 TAUs and 32 Rasterization Operator Units.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7850 130 Watts
Geforce GTX 670 170 Watts
Difference: 40 Watts (31%)

Memory Bandwidth

Theoretically speaking, the Geforce GTX 670 should be 25% quicker than the Radeon HD 7850 in general, because of its higher bandwidth. (explain)

Geforce GTX 670 192000 MB/sec
Radeon HD 7850 153600 MB/sec
Difference: 38400 (25%)

Texel Rate

The Geforce GTX 670 is a lot (about 86%) faster with regards to anisotropic filtering than the Radeon HD 7850. (explain)

Geforce GTX 670 102480 Mtexels/sec
Radeon HD 7850 55040 Mtexels/sec
Difference: 47440 (86%)

Pixel Rate

If running with a high resolution is important to you, then the Geforce GTX 670 is a better choice, not by a very large margin though. (explain)

Geforce GTX 670 29280 Mpixels/sec
Radeon HD 7850 27520 Mpixels/sec
Difference: 1760 (6%)

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

Geforce GTX 670

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

Model Geforce GTX 670 Radeon HD 7850
Manufacturer nVidia AMD
Year May 2012 March 2012
Code Name GK104 Pitcairn Pro
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 2048 MB 2048 MB
Core Speed 915 MHz 860 MHz
Shader Speed 915 MHz (N/A) MHz
Memory Speed 1500 MHz (6000 MHz effective) 1200 MHz (4800 MHz effective)
Unified Shaders 1344 1024
Texture Mapping Units 112 64
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
DirectX Version DirectX 11.0 DirectX 11.1
OpenGL Version OpenGL 4.2 OpenGL 4.2
Power (Max TDP) 170 watts 130 watts
Shader Model 5.0 5.0
Bandwidth 192000 MB/sec 153600 MB/sec
Texel Rate 102480 Mtexels/sec 55040 Mtexels/sec
Pixel Rate 29280 Mpixels/sec 27520 Mpixels/sec

Memory Bandwidth: Bandwidth is the max amount of data (counted in MB per second) that can be transferred past the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the graphics 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 video card could possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Comments

One Response to “Geforce GTX 670 vs Radeon HD 7850”
Graphic Crad Expert says:
I have recently bought GTX 670...due to HD 7850 wasn't enough powerfull to max out my brand new Crysis 3 game!
I was Between GTX 670 and HD 7970 but considering that GTX 670 is using much lower power consumption and have more overclock stabillity than HD 7970 was the reason that i bought GTX 670!!!

Both cards are great if you play sport/rpg/simulator/strategy games then go for AMD if you play games like Battlefield 3 or Crysis 3 or Batman Arkham city then nVidia all the way!
Moreover nVidia drivers are much better than ATi's is!

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