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Old 01-08-2018, 04:12 PM
Meeho Meeho is offline
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Join Date: Jan 2018
Posts: 6
Meeho is reading into overclocking
Default F4-3200C15D-32GTZKW stability issues

Hi,

I have some issues with my new build with G.Skill TridentZ F4-3200C15D-32GTZKW 2x16 GB memory.

Intel i7-8700K
ASUS Prime Z370-A w/latest BIOS
Win 7 Pro x64

It fails Prime95 within 5-40 minutes with rounding errors at the rated 3200 MHz CL15-15-15-35-2T 1.35 V settings.

I've tried VCCSA/VCCIO voltages in the 1.0-1.3 V range without success. CPU is running stock, Asus MCE disabled.

What is interesting is that each stick tested individually works, but they fail when paired. If I bump the tRCD and tRP I regain stability.

My MBO sets these timings:

CL - 15
tRCD - 15
tRP - 15
tRAS - 35
CMD - 2

RAS to RAS Delay L - 7
RAS to RAS Delay S - 6
REF Cycle Time - 560
Refresh Interval - 12480
READ to PRE Time - 12
FOUR ACT WIN Time - 34
CKE Minimum Pulse Width - 8
Write Latency - 13

tRDRD_sg - 7
tRDRD_dg - 4
tRDWR_sg - 16
tRDWR_dg - 16
tWRWR_sg - 7
tWRWR_dg - 4
tWRRD_sg - 32
tWRRD_dg - 25
tRDRD_dr - 7
tRDRD_dd - 7
tRDWR_dr - 16
tRDWR_dd - 16
tWRWR_dr - 9
tWRWR_dd - 9
tWRRD_dr - 9
tWRRD_dd - 9
TWRPRE - 42
TRDPRE - 12
tREFIX9 - 108
OREF_RI - 64

If I downclock the memory to 2133 MHz, I regain stability. I've also tried 3400-15-16-16-35-2T 1.35V and it's much more stable but still fails after about two hours.

I've tried the other memory slots, same results.

Bad memory? Motherboard? CPU IMC?
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