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GIGABYTE X99-SLI (Intel X99) Motherboard Review (Page 3)

By Steven Bassiri from Jul 21, 2015 @ 9:00 CDT
TweakTown Rating: 89%Manufacturer: GIGABYTE

Circuit Analysis


The CPU VRM features a total of 6 phases; each is powered by an integrated power stage, the well-known International Rectifier (Infineon) PowIRstages. There are six high capacity server grade inductors made by Cooper Bussmann. The FP1007R3-R15-R are 0.15uH Flat-Pac series power inductors, they feature 76A saturation current at 25C, this is an extremely high current rating, and will help reduce overall heat around the VRM area. The X99-SLI uses 9x Nippon Chemicon 10K can-type polymer capacitors each rated at 560uF for a total of 5040uF.


The X99-SLI is using the International Rectifier IR3580, an 8 phase digital PWM, the latest one that is offered by International Rectifier. GIGABYTE has used the IR3556 for the power stages; each one can output 50A at about 10W and 90% efficiency. The IR3556 is a brand new PowIRstage, it replaces the IR3551.


There are two sets of everything for the DDR4 power on X99, this is because there are two sets of DIMMs on every X99 motherboard. GIGABYTE chose to stay with digital PWM control for all four DDR4 VRMs; the International Rectifier IR3570 is a 3+2 phase digital PWM perfect for this. Two of these PWMs are in use, one on each side of the board.

There are four DDR4 VRMs because each set of DIMMs requires a DRAM voltage of 1.2v and a DRAM VPP voltage of 2.5v. The 1.2v rail is the most important, and on this board each set of DIMMs get one phase, powered by a 40A International Rectifier IR3553. The VPP is powered by a single phase that also uses the IR3553.


This array of 9x Richtek RT9018 is used to power individual pins in the socket. Since GIGABYTE and other manufacturers have added extra pins into the CPU socket they need to power those pins independently of the CPU, and thus linear regulators are used. An IT8792E is an embedded controller (one of 3 extra) which controls these linear regulators. This circuit design has some pleasing aesthetics.


Under the EMI shield is an ALC1150 and a Texas Instruments NE5532 is used to amplify the output for the backpanel IO headphone jack.

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