press-fit DIMM seems interesting concept:
1) press-fit DIMM can offer high degree of flexibility to memory IP vendors
to evaluate their IP performance under different loading conditions on
single test-board. Most memory IP vendors always wish to evaluate IP under
all possible loading conditions on a single test-board and qualify their IP
performance.
2) non-functional DIMM is not unnecessary bottleneck. it can be completely
removed, if selected press-fit. (better signal integrity for one DIMM
operation even if PCB design is done for multi-DIMM)
3) saves PCB assembly cost as connection is solder-less process.
Thanks
Sanjeev
On Fri, Jul 8, 2016 at 5:22 PM, Thompson, Gary <gary.thompson@xxxxxxxxx>
wrote:
Go SMT if you can. It provides better signal integrity, and improves
routability. Those long through hole DIMM connectors provide a pretty tough
fence to route through.
There are some production issues you need to be aware of. The long thin
plastic body of the connector can expand considerably over temperature.
This can lead to registration or solderability problems if you don't
account for it. The first product we build with SMT connectors actually
bowed up in the middle because we had staked both PCB keepers at the ends
rigidly to the PCB. We now use slots at the ends to allow the plastic a
little expansion room.
===================================================================
Gary Thompson
Intel Corporation
Platform Engineering Group
Scalable Performance CPU Development
===================================================================
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