The GF106 & Its Features
The GF 106
Since the GF106 is based off of the exact same core design as the GF104, we recommend that you take a close look at our in-depth GF104 architecture analysis before reading any further. If you aren’t willing to do that, let’s just say that the GF106 at the heart of the GTS 450 1GB is essentially half of a fully enabled GF104. This evolution of the GF100 architecture is aimed at appeasing a market that is looking for higher efficiency than the higher end cards are capable of and yet still wants respectable performance. NVIDIA achieved this by upping the texture unit count per SM and slightly modifying the path by which higher level data is passed through the architecture.
The desktop GF106 has four Streaming Multiprocessors which each contains 48 CUDA cores, 8 Special Function Units, 64KB of L1 cache, eight texture units and a Polymorph Engine containing the fixed function stages. In total, an unblemished GF106 has 192 cores and 32 texture units while lower-end cards could be created by disabling one or more of the SMs. This is all serviced by a single Raster Engine, 16 ROPs, 256KB of L2 cache and a pair of 64-bit memory controllers. Meanwhile, the mobile market uses a GF106 core with 24 ROPs, 384KB of L2 cache and a 192-bit memory bus for the GTX 460M.
The GF106’s Features
As it stands, the GF106-based cards are the lowest priced units in the lineup that are compatible with NVIDIA’s Surround multi-monitor gaming setup. SLI is of course a requirement for Surround, but from our experiences the GTS 450 1GB is more than capable of delivering playable framerates across several monitors, as long as the detail settings are kept within acceptable ranges.
It goes without saying that other NVIDIA technologies such as CUDA, PhysX and 3D Vision are all useable on GF106-based cards but one of the main draws of the Fermi architecture’s efficient side is its ability to act as a higher-end HTPC card.
3D Vision & Blu Ray 3D
Even though we believe the whole “3D” craze in Hollywood is highly misplaced when it comes to actual movie support, there is no arguing with the fact people’s interest in it is growing. Through the use of a built-in HDMI 1.4 connector, the GF106 and GF104 support the 3D Blu-ray format which is an absolute necessity for watching movies in 3D. Naturally, you will need supporting software like Cyberlink’s PowerDVD 3D but luckily NVIDIA has also released 3D Vision Play to guide things along.
3D Vision Play is the final piece of the PC 3D movie puzzle. This piece of software allows the NVIDIA GPU to sync with 3D capable HDTVs via the HDMI 1.4 output. As a result, the standard 3D Vision glasses can be made to work with a TV set that would otherwise be incompatible, but beware that some HDTVs may still be incompatible.
Lossless Audio Playback
All of the GF104 and GF106 GPUs also support full bitstreaming of HD audio over HDMI. This means every bit of signal processing is done on the GPU itself without the need for external decoding. This is a huge step forward for those of you who want true high definition audio to go along with a 3D experience but once again you will need software that supports this feature.
Much like ATI, NVIDIA now has their own HDMI audio driver that is packaged along with their standard Forceware driver stack. With the 250-series drivers, this worked perfectly for us in the latest version of PowerDVD 10 but there is a catch. Below is a response from Cyberlink regarding how to get BD Bitstreaming working on PowerDVD. Supposedly, the process will be streamlined in later versions.
To get BD audio bitstreaming going you will need to play a Blu-ray disc, pause, then go to the settings menu. Make sure you select your HDMI audio output, and then select “Non-decoded high-definition audio to external device.
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