ViperJohn 790i Kit Install Instructions

Inside your package you will find the Water Block and Mosfet Heat Sinks in plastic bags.

There is another smaller bag in with the water block that contains it's mounting hardware.

You will also find five foam pads (one spare) to apply to the MCP southbridge chip

substrate to stabilize the EverCool MCP coolers mount inside that smaller bag in with

the water block as well. Refer to the attached MCP Foam Stab Pads.jpg for where to

 

place the foam pads on the MCP chip substrate before mounting the MCP cooler.

First Some Tech Notes:

(1) The water blocks in the NCIX 790i kits kits are machined for use with D-TEK Customs

G1/4 hose barbs. For 1/2" hose barbs order NCIX P/N 24355. For 3/8" hose barbs order

NCIX P/N 25262.

(2) Resist the temptation to disassemble the water block to look inside please. The water

blocks base is fly cut and lapped after assembly to be insure the base is true and flat and

any base distortions from tightening the WB's assembly screws is removed. If you

disassemble then reassemble that flat/true lap job will be lost.

(3) The base of the mosfet heat sink that mounts on the motherboard right edge (single

dog leg heat sink with anti-roll pins) is deliberately crowned outward at the center.

This is to help compensate for the motherboard bow that occurs in this area when a CPU

cooler is installed...even when a backplate is used.

(4) If your motherboard uses thermal interfaces pads on the mosfets do not reuse them

when installing any of the Viper kit parts. Use one of the thermal compounds referenced

below.

(5) The coolant can flow through the water block in either direction and makes no

difference in cooling performance one way or the other.

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The mosfet heat sinks mount using four of the stock 2mm insulated cup, captive spring

screws that are used to retain the stock 790i chipset cooler assembly. After cleaning

the mosfets of any old TIM apply a dab of either Arctic Silver Ceramique or Tuniq TX-2

compound to each mosfet and install the heat sinks. If you thread a round tooth pick part

way into each threaded heat sink hole they make a handy pilot for lining the heat sinks up

with the mounting holes in the motherboard.

Installing the water block is pretty simple. Refer to the 790i SPP WB Mount.jpg drawing

for the water block mounting hardware install order. The insulating washers in the picture

are .015" thick grey fiber washers.

(1) Remove the mounting screw/washer/spacers sets from the small bag containing

mount hardware and set aside within easy reach. Place the hardware in small dish

or bowel so no pieces get lost before you install them.

(2) Remove the protective film from the WB base and clean off any residue with Acetone,

Lacquer Thinner or Denatured Alcohol and a paper towel. Do the same with the

mosfet heat sink bases, the mosfets, the SPP die/substrate and the MCP die/

substrate.

(3) Apply thermal compound to the SPP die. I recommend either Arctic Silver Ceramique

or Tuniq TX-2 compounds. Do not use AS5 or any metal bearing thermal compound

as the are capacitive (not conductive) so any compound squeeze out that get on the

bypass, noise suppression or de-coupling SMC's on the chip substrates will change

their capacitance values and characteristics.

(4) Stand the motherboard on end with the PCI/PCIe slots facing up. Insert both mounting

screws w/ washers through the back of the MB then slide a precision length machined

Nylon spacer onto each screw. It really helps to have a helper as a third hand here.

(5) Grab the WB and start a screw into one of the water block mounting holes then do the

same with the second screw. Make sure the nylon spacers stay on both screws and

try not to let the WB base contact the SPP die before you have both screws started

into the water block. This prevents the water block from sliding and smearing the

thermal compound around before the water block is properly lined up with it's mounting

holes in the motherboard.

(6) Once both screws are started (again make sure the nylon spacers are still on the

screws) press the water down onto the spacers and the SPP die then tighten both

screws until they come into contact with the lock washers. Do not tighten either

mounting screw all of the way until both mounting screws are in lite contact with the

lock washers.

(6) Snuggly/Firmly tighten both mounting screws You do not need to go killer tight here!!!

(7) That's it your done.