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GeForce GTX 650 vs Radeon HD 6670 (OEM) 1GB

Intro

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

Compare those specifications to the Radeon HD 6670 (OEM) 1GB, which comes with a GPU core clock speed of 800 MHz, and 1024 MB of GDDR5 RAM set to run at 1000 MHz through a 128-bit bus. It also is comprised of 480 Stream Processors, 24 TAUs, and 8 Raster Operation Units.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6670 (OEM) 1GB 63 Watts
GeForce GTX 650 64 Watts
Difference: 1 Watts (2%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 650 should be quite a bit faster than the Radeon HD 6670 (OEM) 1GB in general. (explain)

GeForce GTX 650 80000 MB/sec
Radeon HD 6670 (OEM) 1GB 64000 MB/sec
Difference: 16000 (25%)

Texel Rate

The GeForce GTX 650 will be much (more or less 76%) better at texture filtering than the Radeon HD 6670 (OEM) 1GB. (explain)

GeForce GTX 650 33856 Mtexels/sec
Radeon HD 6670 (OEM) 1GB 19200 Mtexels/sec
Difference: 14656 (76%)

Pixel Rate

The GeForce GTX 650 should be a lot (approximately 165%) more effective at anti-aliasing than the Radeon HD 6670 (OEM) 1GB, and should be able to handle higher resolutions while still performing well. (explain)

GeForce GTX 650 16928 Mpixels/sec
Radeon HD 6670 (OEM) 1GB 6400 Mpixels/sec
Difference: 10528 (165%)

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 650

Amazon.com

Radeon HD 6670 (OEM) 1GB

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 650 Radeon HD 6670 (OEM) 1GB
Manufacturer nVidia AMD
Year September 2012 February 2011
Code Name GK107 Turks
Fab Process 28 nm 40 nm
Bus PCIe 3.0 x16 PCIe 2.1 x16
Memory 2048 MB 1024 MB
Core Speed 1058 MHz 800 MHz
Shader Speed 1058 MHz (N/A) MHz
Memory Speed 1250 MHz (5000 MHz effective) 1000 MHz (4000 MHz effective)
Unified Shaders 384 480
Texture Mapping Units 32 24
Render Output Units 16 8
Bus Type GDDR5 GDDR5
Bus Width 128-bit 128-bit
DirectX Version DirectX 11.0 DirectX 11
OpenGL Version OpenGL 4.3 OpenGL 4.1
Power (Max TDP) 64 watts 63 watts
Shader Model 5.0 5.0
Bandwidth 80000 MB/sec 64000 MB/sec
Texel Rate 33856 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 16928 Mpixels/sec 6400 Mpixels/sec

Memory Bandwidth: Bandwidth is the max amount of information (in units of MB per second) that can be transferred across the external memory interface in one second. It is calculated by multiplying the bus width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total texture units by the core speed of the chip. The higher this number, the better the graphics card will be at handling 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 could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

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