Old RAM ran at 2666, new RAM running at 2400 even though rated for 2666 (3200 XMP)......

porkpie74
porkpie74 Member Posts: 3 New User
in Nitro Gaming
Hi folks. So I bought wrong model (AN515-43-R5W3) and have increased RAM from 2x 4GB Samsung to 2x 8GB Crucial. This is me now:
NorthbridgeAMD Ryzen SOC rev. 00
SouthbridgeAMD Carrizo FCH rev. 51
Bus SpecificationPCI-Express 3.0 (8.0 GT/s)
Graphic InterfacePCI-Express 3.0
PCI-E Link Widthx16 (max 16x)
PCI-E Link Speed8.0 GT/s (max 8.0 GT/s)
Memory TypeDDR4
Memory Size16 GBytes
ChannelsDual
Memory Frequency1200.0 MHz ()
CAS# latency (CL)18.0
RAS# to CAS# delay (tRCD)18
RAS# Precharge (tRP)18
Cycle Time (tRAS)39
Bank Cycle Time (tRC)57
Command Rate (CR)1T
Uncore Frequency1197.6 MHz
  
Memory SPD 
DIMM #1
     SMBus address0x50
     Memory typeDDR4
     Module formatSO-DIMM
     Module Manufacturer(ID)Crucial Technology (7F7F7F7F7F9B00000000000000)
     SDRAM Manufacturer (ID)Micron Technology (2C000000000000000000000000)
     Size8192 MBytes
     Max bandwidthDDR4-2667 (1333 MHz)
     Part numberBL8G32C16S4B.M8FE
     Serial numberE3ABD89A
     Manufacturing dateWeek 02/Year 21
     Nominal Voltage1.20 Volts
     EPPno
     XMPyes
     XMP revision2.0
     AMPno
JEDEC timings tableCL-tRCD-tRP-tRAS-tRC @ frequency
     JEDEC #110.0-10-10-23-33 @ 701 MHz
     JEDEC #211.0-12-12-25-36 @ 771 MHz
     JEDEC #312.0-12-12-27-39 @ 842 MHz
     JEDEC #413.0-13-13-30-43 @ 912 MHz
     JEDEC #514.0-14-14-32-46 @ 982 MHz
     JEDEC #615.0-15-15-34-49 @ 1052 MHz
     JEDEC #716.0-16-16-36-52 @ 1122 MHz
     JEDEC #817.0-17-17-39-56 @ 1192 MHz
     JEDEC #918.0-18-18-41-59 @ 1263 MHz
     JEDEC #1019.0-19-19-43-62 @ 1333 MHz
     JEDEC #1120.0-19-19-43-62 @ 1333 MHz
     JEDEC #1221.0-19-19-43-62 @ 1333 MHz
     JEDEC #1322.0-19-19-43-62 @ 1333 MHz
     JEDEC #1423.0-19-19-43-62 @ 1333 MHz


The timings are currently somewhere between JEDEC #8 and #9 resulting in the 2400Mhz result? Would just need a small tweak upwards to get to 2666. From what I have read, I cannot change timings in BIOS as this is not an option. How has my system 'chosen' these timings? Is that set in stone? Did my old modules achieve 2666 because their JEDEC ratings were just a wee bit lower? Basically can anything be done, or have I compounded my original error by buying wrong RAM as well? Apologies for using the wrong terminology..... 


Best Answer

Answers

  • batmalin
    batmalin Member Posts: 4,231 Guru
    Your CPU supports up to 2400Mhz therefore everything is fine  https://www.amd.com/en/products/apu/amd-ryzen-5-3550h
    In some cases while the CPU is in turbo mode(overclocked) it could reach 2666Mhz, but normal operation is 2400Mhz. Do some user benchmark test to see if it reaches 2666Mhz while on load(turbo mode) Check my results in my signature for reference.



    Please click "Yes" if I have answered your question.
    Userbench: https://www.userbenchmark.com/UserRun/31177158

  • porkpie74
    porkpie74 Member Posts: 3 New User
    Thanks for your reply. The old modules used to show at 2666 in Performance tab of Task Manager when laptop was doing nothing much though
  • batmalin
    batmalin Member Posts: 4,231 Guru
    Glitch in the matrix? I mean Windows bug? Not possible as the CPU has the memory controller build in. So I bet on Windows bug
    Please click "Yes" if I have answered your question.
    Userbench: https://www.userbenchmark.com/UserRun/31177158

  • porkpie74
    porkpie74 Member Posts: 3 New User
    Balls. I did not do enough research (again!). I saw that figure and assumed I would need comparable speed in upgrade.............
    CHeers
  • batmalin
    batmalin Member Posts: 4,231 Guru
    Answer ✓
    Don`t regret your purchase,  I did the same. They will reach 2666 under load e.g. gaming as the CPU will operate in turbo mode. Look at my modules
    Please click "Yes" if I have answered your question.
    Userbench: https://www.userbenchmark.com/UserRun/31177158

This discussion has been closed.

Categories