The memory frequency decreased from 2666 to 2400 when adding memory HP DESCTOP PC - 880 - 191ur

[ReSilent_74]

HP DESCTOP PC - 880 - 191ur

Initially, there was 16 gb Hyprt X Fury kingston 2666 and the memory worked at 1333. After adding the second 16 gb Hyper X Fury Kingston 2666 module, the memory worked in dual-channel mode, but the frequency dropped to 1200.
The modules are identical in appearance. There are XMP profiles that are visible in CPU-Z. There XMP-2666 frequency 1333 on both modules, but the delay values ​​and the other are slightly different.
I tried to swap them, but the speed did not return to 1333

Factory Installed Module

Memory SPD
-------------------------------------------------------------------------

DIMM # 1
SMBus address 0x51
Memory type DDR4
Module format UDIMM
Module Manufacturer(ID) Kingston (7F98000000000000000000)
SDRAM Manufacturer (ID) Micron Technology (2C00000000000000000000)
Size 16384 MBytes
Max bandwidth DDR4-2666 (1333 MHz)
Part number HP26D4U9D8ME-16X
edited
Manufacturing date Week 37/Year 18
Nominal Voltage 1.20 Volts
EPP no
XMP yes
XMP revision 2.0
AMP no
JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency
JEDEC #1 10.0-10-10-24-34 @ 727 MHz
JEDEC #2 11.0-11-11-26-37 @ 800 MHz
JEDEC #3 12.0-12-12-28-40 @ 872 MHz
JEDEC #4 13.0-14-14-31-44 @ 945 MHz
JEDEC #5 14.0-14-14-33-47 @ 1018 MHz
JEDEC #6 15.0-15-15-35-50 @ 1090 MHz
JEDEC #7 16.0-16-16-38-54 @ 1163 MHz
JEDEC #8 17.0-17-17-40-57 @ 1236 MHz
JEDEC #9 18.0-18-18-42-60 @ 1309 MHz
JEDEC #10 19.0-19-19-43-61 @ 1333 MHz
JEDEC #11 20.0-19-19-43-61 @ 1333 MHz
JEDEC #12 21.0-19-19-43-61 @ 1333 MHz
JEDEC #13 22.0-19-19-43-61 @ 1333 MHz
JEDEC #14 23.0-19-19-43-61 @ 1333 MHz
XMP profile XMP-2666
Specification DDR4-2666
Voltage level 1.200 Volts
Min Cycle time 0.750 ns (1333 MHz)
Max CL 19.0
Min tRP 14.25 ns
Min tRCD 14.25 ns
Min tRAS 32.25 ns
Min tRC 45.75 ns
Min tRRD 3.00 ns
XMP timings table CL-tRCD-tRP-tRAS-tRC-CR @ frequency (voltage)
XMP #1 9.0-9-9-21-29-n.a @ 631 MHz (1.200 Volts)
XMP #2 10.0-10-10-23-33-n.a @ 701 MHz (1.200 Volts)
XMP #3 11.0-12-12-25-36-n.a @ 771 MHz (1.200 Volts)
XMP #4 12.0-12-12-28-39-n.a @ 842 MHz (1.200 Volts)
XMP #5 13.0-13-13-30-42-n.a @ 912 MHz (1.200 Volts)
XMP #6 14.0-14-14-32-45-n.a @ 982 MHz (1.200 Volts)
XMP #7 15.0-15-15-34-49-n.a @ 1052 MHz (1.200 Volts)
XMP #8 16.0-16-16-37-52-n.a @ 1122 MHz (1.200 Volts)
XMP #9 17.0-17-17-39-55-n.a @ 1192 MHz (1.200 Volts)
XMP #10 18.0-18-18-41-58-n.a @ 1263 MHz (1.200 Volts)

( Bought and installed by me)
DIMM # 2
SMBus address 0x53
Memory type DDR4
Module format UDIMM
Module Manufacturer(ID) Kingston (7F98000000000000000000)
SDRAM Manufacturer (ID) SK Hynix (AD00000000000000000000)
Size 16384 MBytes
Max bandwidth DDR4-2666 (1333 MHz)
Part number KHX2666C16/16G
edited
Manufacturing date Week 46/Year 18
Nominal Voltage 1.20 Volts
EPP no
XMP yes
XMP revision 2.0
AMP no
JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency
JEDEC #1 9.0-11-11-22-35 @ 750 MHz
JEDEC #2 11.0-13-13-27-42 @ 916 MHz
JEDEC #3 12.0-14-14-30-46 @ 1000 MHz
JEDEC #4 13.0-15-15-32-50 @ 1083 MHz
JEDEC #5 14.0-16-16-35-54 @ 1166 MHz
JEDEC #6 15.0-17-17-37-58 @ 1250 MHz
JEDEC #7 16.0-18-18-39-61 @ 1333 MHz
JEDEC #8 17.0-18-18-39-61 @ 1333 MHz
JEDEC #9 18.0-18-18-39-61 @ 1333 MHz
XMP profile XMP-2666
Specification DDR4-2666
Voltage level 1.200 Volts
Min Cycle time 0.750 ns (1333 MHz)
Max CL 16.0
Min tRP 13.50 ns
Min tRCD 13.50 ns
Min tRAS 29.25 ns
Min tRC 45.75 ns
Min tRRD 5.25 ns
XMP timings table CL-tRCD-tRP-tRAS-tRC-CR @ frequency (voltage)
XMP #1 9.0-11-11-22-35-n.a @ 750 MHz (1.200 Volts)
XMP #2 10.0-12-12-25-39-n.a @ 833 MHz (1.200 Volts)
XMP #3 11.0-13-13-27-42-n.a @ 916 MHz (1.200 Volts)
XMP #4 12.0-14-14-30-46-n.a @ 1000 MHz (1.200 Volts)
XMP #5 13.0-15-15-32-50-n.a @ 1083 MHz (1.200 Volts)
XMP #6 14.0-16-16-35-54-n.a @ 1166 MHz (1.200 Volts)
XMP #7 15.0-17-17-37-58-n.a @ 1250 MHz (1.200 Volts)
XMP #8 16.0-18-18-39-61-n.a @ 1333 MHz (1.200 Volts)
XMP #9 17.0-18-18-39-61-n.a @ 1333 MHz (1.200 Volts)
XMP #10 18.0-18-18-39-61-n.a @ 1333 MHz (1.200 Volts)

I installed and launched the Intel Extreme Tuning Utility, it says that the memory works in the default settings for 2400.
In ADVANCE TUNING, profile 1: XMP is visible, but it has Tcl 15, and everything else is zeros.
I could try to set everything manually, but there are too many values.

[Grzwacz]

Greetings,

Welcome to the forum.

I am not a HP employee.

That is interesting. The new module part number is not identical to the HP module.

Timings are similar.

HP Motherboards can be finicky. Memory is best installed in kits or the new module should have the same part number.

I think you would have to only install the HP module @2666 in the original slot HP used at the factory. Then reset CMOS to get  back to this speed.

Regards

[Grzwacz]

Hi,

Additional thought on this.

I can't discern any user performance improvement when using memory at 2666 versus 2400.

Memory benchmarks will reflect better performance but the user experience should be identical, it is for me.

I don't think I would lose sleep over this problem.

Regards

[ReSilent_74]

Thanks for the answer. I installed the factory installed module and reset cmos

typhoon program data for both modules

NEW module

OLD module 

уууууууeee

eventually

I understand that the old memory has such a big delay 19,
that the new module refuses to work on such delays and they are synchronized at a frequency of 2400 (1200).

At least both modules and HYPER X FURY BLACK 2666

I wanted my memory to work in dual-channel mode at a frequency of 2666, but got dual-channel memory at a lower frequency with faster timings.

[ReSilent_74]

[ReSilent_74]

I found the module as similar as possible to the factory one.
Will it start in dual channel mode with factory mode at 2666 ?

[Grzwacz]

Hi,

I don't know.

Memory should be installed in matching pairs for dual channel memory.

Mixing manufacturers  and timings may result in both sticks running at the default settings.

Regards

[ReSilent_74 · Accepted solution]

The goal is achieved. The memory runs at 2666. I changed the memory module to the Kingston HyperX FURY Black Series [HX426C16FBK2 / 32] 32 GB memory module set.
It works perfectly, I attach a screenshot. The factory kit is not used.