The document discusses MSI DDR4 Boost technology and how it addresses fiber weave effect in PCB routing. Fiber weave effect occurs when signal traces are routed over fiberglass bundles versus resin-rich areas, which can cause signal distortion. MSI DDR4 Boost technology uses a zig-zag routing procedure to prevent traces from being routed directly over fiberglass bundles. This ensures signal quality stays stable and reduces radiation interference.

1. MSI DDR4 Boost
Technology Info

2. 2
Fiber Weave Effect
If trace routed over a fiberglass horizontally or vertically the signal would become distortion because it is lay on fiber weave
and resin(holes). The trace should always be on fiber weave or on resin to make sure signal performance stable.
Fiber weave Effect
Figure 2 Fiber weave effect example of differential pair routing showing one
trace routed over a fiberglass bundle for a portion of its length while the
other trace is routed over mostly resin.
Cross-Section of PCB indicating effect of PCB Fiber Weave
Etching / Plating impacts on Trace Geometries
Fiberglass Bundle Waves
directly under trace
Resin rich dielectric
directly under trace

3. RX should get the same wave from TX
TX TXRX RX
Excellent Poor

4. MSI DDR4 BOOST Technology
Layout Engineer make sue of
Zig-Zag routing procedure to
prevent fiber weave effect to
make sure signal quality
stable and reduce radiation
interference
Figure 15: 11.31 Degree Zig-Zag
All length dimensions are in mils
All control Trace vertices are located on 5
mil grid points making manual routing
easier to manage.
Control Trace
250
50
250
11.31°
50

5. Server Level Routing
Figure 14. Zig-Zag Routing
L
W
L
W
θ=tan (W/L)-1
θ
CPU
Memory

6. Moat: just like wall to prevent outer noise interference

7. What Our
Memory Partners
Say…

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