Z490-E 10900K RAM speed issues! Unable to XMP or run advertised 3600 speed.

[bwana]

OOPS! I made a mistake in reporting what I was seeing. I THOUGHT I was at DDR 3600 because I was reading HWinfo and AIDA. But ACTUALLY, I was at 1066-> 2133!
I explicitly set speed to 16-16-3200 at 1.35 v and it would not post!

[bwana]

see my post above. I moved them to the other slots
17-17-17-38 @ DDR 4266
AIDA Read 61262 Write 64087 Copy 58730 Latency 41.6ns

[lassek]

I have the purchased similar ram as you F4-3600C16D-32GTZN. I installed into ASUS Maximus XII Hero wifi. I also could not get the 'first boot' either with default or XMP 1. However, I went into bios, set XMP 2, scrolled down to look at the changes and then went back and changed XMP 2 to auto. F10 and then the board booted!

Thaiphoon says this about my sticks:

Module Manufacturer: G.Skill
Module Part Number: F4-3600C16-16GTZN
Module Series: Trident Z Neo
DRAM Manufacturer: Samsung
DRAM Components: K4A8G085WB-BCPB
DRAM Die Revision / Process Node: B / 20 nm

This is clearly wrong so something is not right in the SPD or whereever the ram 'metadata' is stored.

                                            XMP1                                XMP2
Speed Grade:                                    DDR4-3604                           N/A 
DRAM Clock Frequency:                           1802 MHz                            N/A 
Module VDD Voltage Level:                       1.35 V                              N/A 
Minimum DRAM Cycle Time (tCK):                  0.555 ns                            N/A 
CAS Latencies Supported:                        16T                                 N/A 
CAS Latency Time (tAA):                         16T                                 N/A 
RAS# to CAS# Delay Time (tRCD):                 16T                                 N/A 
Row Precharge Delay Time (tRP):                 16T                                 N/A 
Active to Precharge Delay Time (tRAS):          36T                                 N/A 
Active to Active/Refresh Delay Time (tRC):      52T                                 N/A 
Four Activate Window Delay Time (tFAW):         44T                                 N/A 
Short Activate to Activate Delay Time (tRRD_S): 4T                                  N/A 
Long Activate to Activate Delay Time (tRRD_L):  9T                                  N/A 
Normal Refresh Recovery Delay Time (tRFC1):     631T                                N/A 
2x mode Refresh Recovery Delay Time (tRFC2):    469T                                N/A 
4x mode Refresh Recovery Delay Time (tRFC4):    289T                                N/A

1.35v @ 1801 MHz  16-16-16-36  (CL-RCD-RP-RAS) / 52-631-469-289-9-4-44  (RC-RFC1-RFC2-RFC4-RRDL-RRDS-FAW)

DRAM Timing Parameters Fine Timebase:                      .001 ns 
Medium Timebase:                                           0.125 ns 
CAS Latencies Supported:                                   10T, 11T, 12T, 13T,14T, 15T, 16T 
Minimum Clock Cycle Time (tCK min):                        0.938 ns (1066.10 MHz) 
Maximum Clock Cycle Time (tCK max):                        1.500 ns (666.67 MHz) 
CAS# Latency Time (tAA min):                               13.750 ns 
RAS# to CAS# Delay Time (tRCD min):                        13.750 ns 
Row Precharge Delay Time (tRP min):                        13.750 ns 
Active to Precharge Delay Time (tRAS min):                 33.000 ns 
Act to Act/Refresh Delay Time (tRC min):                   46.750 ns 
Normal Refresh Recovery Delay Time (tRFC1 min):            350.000 ns 
2x mode Refresh Recovery Delay Time (tRFC2 min):           260.000 ns 
4x mode Refresh Recovery Delay Time (tRFC4 min):           160.000 ns 
Short Row Active to Row Active Delay (tRRD_S min):         3.700 ns 
Long Row Active to Row Active Delay (tRRD_L min):          5.300 ns 
Long CAS to CAS Delay Time (tCCD_L min):                   5.625 ns 
Four Active Windows Delay (tFAW min):                      21.000 ns 
Maximum Active Window (tMAW):                              8192*tREFI 
Maximum Activate Count (MAC):                              Unlimited MAC 
DRAM VDD 1.20 V operable/endurant:                         Yes/Yes 
Supply Voltage (VDD), Min / Typical / Max:                 1.16V / 1.20V / 1.26V 
Activation Supply Voltage (VPP), Min / Typical / Max:      2.41V / 2.50V / 2.75V 
Termination Voltage (VTT), Min / Typical / Max:            0.565V / 0.605V / 0.640V

I think Thaiphoon just reads what's in the specs, not actually what the memory is DOING so I checked with CPU-z
CPU-z says I am running 15-15-15-36 tRFC 374 clocks CR 2

I

This 'neo' memory is marketed for AMD. And I know that AMDers like tight timings because high clocks are not possible with infinity fabric. (It desynchronizes above 3800. So the hocus - pocus of this memory is that it likes tighter timings and indeed, the Maximus Hero has 'automatically' set it for CAS 15 and 3600. I dont know why it did not do this from the start and required me to visit XMP 2 first. If I try to boot with XMP 2 , it fails.

I dont quite understand? Yut get into BIOS .. chose XMP 2 .. then goes back to AUTO? and set manual 3600 mhz? or what? won the AUTO just default to 2133 mhz?

And did you actually get them down on CAS15? sounds crazy at 3600 ?

Please explain in detail, sorry for not understanding.. thanks.

[lassek]

see my post above. I moved them to the other slots
17-17-17-38 @ DDR 4266
AIDA Read 61262 Write 64087 Copy 58730 Latency 41.6ns

I read you later posts..

No matter WHAT I do, I can only get 3333mhz stable.. 16-16-36 2N

I even tried your 17-17-38 no luck ..

it sucks when you paid for that.. I have 4 x 8 gb modeules btw

[bwana]

I had them in slots A1 and B1. Got them to 12-12-12-33 at DDR 3000.

[lassek]

All rigth.. I guess ill have to settle at 3333 mhz... the difference between that and 3600 is basically nothing but its just a principle for me! that buying something that dosent work as advertised..

sigh!