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GIGABYTE 970-Gaming SLI (AMD 970) Motherboard Review (Page 3)

Steven Bassiri | Jul 21, 2016 at 11:40 am CDT - 1 min, 33 secs reading time for this page
Rating: 90%Manufacturer: GIGABYTE

Circuit Analysis

GIGABYTE 970-Gaming SLI (AMD 970) Motherboard Review 15 | TweakTown.com

GIGABYTE has done a great job with the red silkscreen, too bad we only get to see it in full when the heat sinks are removed.

GIGABYTE 970-Gaming SLI (AMD 970) Motherboard Review 16 | TweakTown.comGIGABYTE 970-Gaming SLI (AMD 970) Motherboard Review 17 | TweakTown.com

The VRM for the CPU features 8+2 phases for the CPU Core (VDD) and CPU Northbridge (CPU VDDNB) voltage rails. The VRM is controlled by a highly integrated hybrid Intersil ISL6329 which is specifically designed for AMD platforms and will work well with AMD's SVI. In this configuration, the ISL6329 outputs 4+1 phases, which are doubled to 8+2 by doubling the number of components; I call it dual output doubling and it's not the best way of doubling, but it gets the job done. The PWM has two integrated drivers for the first four phases and the CPU Northbridge phase also gets an integrated driver.

GIGABYTE 970-Gaming SLI (AMD 970) Motherboard Review 18 | TweakTown.comGIGABYTE 970-Gaming SLI (AMD 970) Motherboard Review 19 | TweakTown.com

Each virtual phase uses one NTMFS4C06N as the low-side MOSFET and one NTMFS4C10N for the high-side MOSFET. Each driver is connected to two of each MOSFET. Since the VRM needs 4+1 drivers and only 2+1 drivers are integrated into the PWM, GIGABYTE had to add two ISL6609 MOSFET drivers for two of the remaining CPU Core phases.

GIGABYTE 970-Gaming SLI (AMD 970) Motherboard Review 20 | TweakTown.comGIGABYTE 970-Gaming SLI (AMD 970) Motherboard Review 21 | TweakTown.com

The Northbridge (not to be confused with CPU Northbridge) is powered by a single phase VRM controlled by a Richtek RT8120 single phase PWM with integrated driver. The memory VRM uses a similar setup as the Northbridge, except it uses two low-side MOSFET and a single high-side MOSFET to improve performance.

GIGABYTE 970-Gaming SLI (AMD 970) Motherboard Review 22 | TweakTown.com

A Richtek RT8288A is used to provide the DAC-UP feature where steady power is provided to the two yellow USB 2.0 ports. The separate power controller for the two yellow USB ports allows you turn off USB power completely and only transmit data over the USB lines to an external DAC.

Last updated: Nov 15, 2019 at 01:16 pm CST

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Steven Bassiri

ABOUT THE AUTHOR - Steven Bassiri

Steven went from a fledgling forum reader in 2003 to one of the internet's brightest tech stars by 2010. Armed with an information systems degree, a deep understanding of circuitry, and a passion for tech, Steven (handle Sin0822) enjoys sharing his deep knowledge with others. Steven details products down to the component level to highlight seldom explained, and often misunderstood architectures. Steven is also a highly decorated overclocker with several world records.

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