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GeForce GTX 650 Ti 2GB vs Radeon HD 6670 (OEM) 1GB


Intro

The GeForce GTX 650 Ti 2GB has a clock frequency of 928 MHz and a GDDR5 memory speed of 1350 MHz. It also makes use of a 128-bit bus, and uses a 28 nm design. It is comprised of 768 SPUs, 64 Texture Address Units, and 16 ROPs.

Compare those specs to the Radeon HD 6670 (OEM) 1GB, which makes use of a 40 nm design. AMD has set the core frequency at 800 MHz. The GDDR5 RAM runs at a frequency of 1000 MHz on this particular model. It features 480 SPUs along with 24 TAUs and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6670 (OEM) 1GB 63 Watts
GeForce GTX 650 Ti 2GB 110 Watts
Difference: 47 Watts (75%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 650 Ti 2GB should be 35% quicker than the Radeon HD 6670 (OEM) 1GB in general, because of its greater data rate. (explain)

GeForce GTX 650 Ti 2GB 86400 MB/sec
Radeon HD 6670 (OEM) 1GB 64000 MB/sec
Difference: 22400 (35%)

Texel Rate

The GeForce GTX 650 Ti 2GB is much (approximately 209%) better at AF than the Radeon HD 6670 (OEM) 1GB. (explain)

GeForce GTX 650 Ti 2GB 59392 Mtexels/sec
Radeon HD 6670 (OEM) 1GB 19200 Mtexels/sec
Difference: 40192 (209%)

Pixel Rate

The GeForce GTX 650 Ti 2GB will be a lot (more or less 132%) better at AA than the Radeon HD 6670 (OEM) 1GB, and capable of handling higher resolutions without losing too much performance. (explain)

GeForce GTX 650 Ti 2GB 14848 Mpixels/sec
Radeon HD 6670 (OEM) 1GB 6400 Mpixels/sec
Difference: 8448 (132%)

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 Ti 2GB

Radeon HD 6670 (OEM) 1GB

Specifications

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Model GeForce GTX 650 Ti 2GB Radeon HD 6670 (OEM) 1GB
Manufacturer nVidia AMD
Year October 2012 February 2011
Code Name GK106 Turks
Memory 2048 MB 1024 MB
Core Speed 928 MHz 800 MHz
Memory Speed 5400 MHz 4000 MHz
Power (Max TDP) 110 watts 63 watts
Bandwidth 86400 MB/sec 64000 MB/sec
Texel Rate 59392 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 14848 Mpixels/sec 6400 Mpixels/sec
Unified Shaders 768 480
Texture Mapping Units 64 24
Render Output Units 16 8
Bus Type GDDR5 GDDR5
Bus Width 128-bit 128-bit
Fab Process 28 nm 40 nm
Transistors 2540 million 715 million
Bus PCIe 3.0 x16 PCIe 2.1 x16
DirectX Version DirectX 11.0 DirectX 11
OpenGL Version OpenGL 4.3 OpenGL 4.1

Memory Bandwidth: Bandwidth is the max amount of information (in units of MB per second) that can be moved past the external memory interface in a second. It is calculated by multiplying the bus width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better 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 number of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total number of 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 per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

GeForce GTX 650 Ti 2GB

Radeon HD 6670 (OEM) 1GB

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