The Gigabyte GV-N470SO-13I Super Overclock
Gigabyte has been putting some serious effort into its premium Super Overclock edition graphics cards, often producing products with the highest factory overclocks available. Today, we have the chance to test its new GV-N470SO-13I Super Overclock edition. The raw specifications suggest that this is the fastest factory-overclocked GeForce GTX 470 released to date, and we’re anxious to weigh added performance against the premium you pay for higher-end graphics.
Gigabyte’s overclocked GeForce GTX 470 comes factory-equipped with a core clock speed of 700 MHz, which is almost 100 MHz faster than the stock 607 MHz specification. The shaders run at 1400 MHz, close to 200 MHz higher than Nvidia's reference 1215 MHz. Gigabyte claims that the overclock delivers 12% better performance than a standard GeForce GTX 470, and we’ll see if our benchmarks support this claim. Unfortunately, the card’s memory isn’t overclocked. It runs at the same 837 MHz GDDR5 as Nvidia’s reference card. This should give us some insight as to whether the GF100 GPU is bandwidth-constrained or not.
We find it interesting that Gigabyte has a marketing name for what is essentially a GPU binning process: GPU Gauntlet. The company claims that each GPU is tested for 30 minutes for overclocking headroom. After that, power switching and stability are also tested to ensure that the GPUs with the best power efficiency and lowest power consumption are used in the Super Overclock series. Gigabyte actually guarantees GPU overclocking headroom 15% beyond the reference specification.
A quick glance is all it takes to recognize that Gigabyte elected to arm its card with a more potent cooler than Nvidia’s reference blower. The cooling system is designated as the Windforce 3x, and the company claims that the triple pulse-width modulation (PWM) fan setup (equipped with anti-turbulence inclined fins and copper heat pipes) can generate 27 CFM of airflow per fan--all the while maintaining a quiet 22 dB at idle and 38 dB under load.
Gigabyte's card has a unique circuit board that differs from the reference model. The GV-N470SO-13I sports a beefy 14-phase PWM design, with 12 phases for the GPU and two phases for the memory. Gigabyte’s Ultra Durable VGA+ specification covers a blanket of features that it claims provides the following benefits: 2 oz. copper PCB for better cooling, tier-one Samsung and Hynix memory for better overclocking potential, Japanese solid capacitors for reliability, ferrite core/metal chokes to prevent energy loss, low RDS on MOFSET for faster electric current charging and discharging, and high-quality film capacitors. We have tested Gigabyte's Ultra Durable claims in the past--specifically the benefits of 2 oz. of copper on the PCB--and found the results have some merit. But the difference in performance isn't as substantial as the company's marketing department might have you expect, so keep that in mind.
For all of its performance-oriented features, the card’s outputs are standard GeForce GTX 470 fare, including two dual-link DVI outputs complemented by a single mini-HDMI output. As with reference GeForce GTX 470s, remember that you can only use two of the three digital outputs at a time.
Our test card arrived bare, sans retail bundle. However, according to Gigabyte’s marketing materials, the retail version includes a DVI-to-VGA adapter, a mini HDMI-to-HDMI cable, two Molex-to-PCI Express (PCIe) power connector adapters, a manual, and the necessary driver and utility CD.
Gigabyte put a lot of effort into improving its OC Guru tweaking utility. Not only can the user adjust clock rates and GPU voltage, but memory voltage is also adjustable. This is a feature missing on competing utilities, such as MSI’s Afterburner software. OC Guru offers a long list of other capabilities like overclocking, gaming, and energy-efficient presets, five customizable profiles, a real-time hardware monitor, and even a power-savings calculator.
We dig into our overclocking experience and results in the benchmarks. For now, let’s have a look at our test system before we see how this card performs.