You should be abe to run PL 8 with cas 5 eg. 5-4-4- or even 5-5-5. Set DRAM static to enabled, and clock twister to stronger. Set DRAM skews to advanced 300 on A/B (very important).
Do you see much bandwidth and latency difference between Moderate with 50-100ps skew, and Stronger with 300ps skew? I've still yet to figure out what else clock twister changes besides DRAM clock skew, data strobe skew possibly and address strobe skew.
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