1600 running at 1333

i bought asus M5A88m motherboard and phenom IIX6 1090 t and corsair ram xm3 4gb 1600 in one slot but in bios the ram shows 1333 mhz and i changed to 1600 restarted my pc then after working some time the computer restart then i have to change the mhz to 1333 .. my smps is mercury 450 watts 500 rupees. please help me with the problem
28 answers Last reply
More about 1600 running 1333
  1. change bios to 1600 and change latencies too,to reflect those designated for the ram you bought
  2. Change Bios to 1600 as well change latency settings too

    This is a Bios tutorial
  3. This next topics has been merged by Nikorr
  4. IF running DDR3-1600 then it's a little more that setting the DRAM Frequency or Memory Multiplier to accommodate DDR3-1600.

    Tonight I'm a little tired to read your manual, but there's (3) approved methods:
    1. CPU Host/Bus Frequency -> 240 (OC's your CPU so you'll need to (Phenom II X6 1090 3200MHz) set the CPU Multiplier 3200/240 = 14 (14*240MHz = 3.36GHz)
    2. CPU-NB Frequency -> 2400MHz ((DDR3-1600 / 2 = 800MHz) * 3)
    3. Some MOBO's e.g. ASUS offer 'DOCP' for setting RAM profiles, as I recall MSI doesn't off this nice and simple feature :(

    Then manually set the DRAM Frequency/Memory Multiplier, CAS Timings and DRAM Voltage all per Rated spec with your kit.

    Good Luck! :)
  5. i changed the frequency to 1600 and the voltage and latencies is auto so it will adjust to the frequency . ii am able to work inw indows 7 64 bit for some time and after that my computer restarts ....... .. is it because of my Smps becoz mine is 450 watts mercury .. i ahve Phenom II X6 1090 T
  6. It's probably because you simply set the DRAM Frequency, and didn't follow my recommendations.

    While the 6-core 'can' run DDR3-1600~DDR3-2000 it cannot do it reliably without one of the three methods listed above. DDR3-1600 may 'seem' stable, but under load be prepared for a lock-up or shutdown. The AM3 Phenom IMC is weak, touchy and needs additional 'help' to remain stable.
  7. followed your steps . my ram frequency was 1333 in auto and i changed my Cpu frequency to 240 and multiplier to 14.Core speed was 3.36 Ghz and Ram MHZ automatically shown 1600 mhz ........... Hope this is the right way to do ........ launched Cpu Z frequency showing 800. i am little worried about my Smps (PSU) . its only 450 watt mercury . is it o to overclok with is Smps ... Core temp showing in Asus Al suite is 43 degree .......
  8. DDR3 = Double Data Rate revision 3. Meaning the RAM @ DDR3-1600 is in reality running at 800MHz. The 'DDR' means the data on the Sine wave is transmitted on both the top and bottom of the wave and 'SDRAM' the 'S' means it is Synchronized, in this case, the the FSB so to the CPU it is indeed 800MHz*2 = 1600MHz or DDR3-1600.

    See -> http://en.wikipedia.org/wiki/DDR3_SDRAM#JEDEC_standard_modules
    CPU-z reports it as "I/O bus clock (MHz) not as Data rate (MT/s) aka MHz"

    It's working at DDR3-1600! :)


    AI Suite IMO is bad and is the root cause for all sorts of problems and conflicts with the BIOS. I do not use any application(s) that is/are invasive to the BIOS.

    Example of DDR3-1600 running per Rated and correctly:
  9. Northbridge AMD 880G rev. 00
    Southbridge AMD SB850 rev. 40
    Memory Type DDR3
    Memory Size 4096 MBytes
    Channels Single
    Memory Frequency 799.9 MHz (3:10)
    CAS# latency (CL) 9.0
    RAS# to CAS# delay (tRCD) 9
    RAS# Precharge (tRP) 9
    Cycle Time (tRAS) 24
    Bank Cycle Time (tRC) 34
    Command Rate (CR) 1T
    Uncore Frequency 1919.8 MHz

    This is my memory in CPU Z ......

    Finally Ram is running at 800 mhz ... thanks :D
  10. after running in 1600 mhz computer restarted.
  11. If the XMS3 is the 1.65v flavor the you must also set the DRAM Voltage -> 1.65v (some BIOS 1.64v). Also set the Command Rate -> 2T.
  12. You have got 6 core processor running on MERCURY power supply. Get a good branded power supply. I was using local VIP 500W with i7 2600k. After overclocking it literally burnt .
  13. change the voltage to 1.65v and command rate to 2T . windows working fine . but after working for 6 to 7 hours pc restarts . temp is 30 to 45 ....
  14. Besides setting the RAM, which approach: 1. CPU Host/Bus Frequency -> 240MHz or 2. CPU-NB Frequency -> 2400MHz?

    If you did neither then pick 1 or 2 above; this is a must with non-FX CPUs.
  15. what is the correct voltage for phenom II X6 1090t overclocking to 3.36 GHz .current voltage is 1.3750 V... please help me with this situation
  16. With that low of an OC, leave the vCore -> Auto; stock is 3.2GHz.

    What EXACT changes to the BIOS have you made above 'Defaults'?
  17. I changed cpu frequency to 240 mhz and multiplier to 14 then ram was 1600 . changed ram voltage to 1.65 v and installed new power supply cooler master 550w . i have no graphic card not planing to install one ...
  18. Leave the CPU Voltage -> Auto. The voltage and CPU frequency varies under load, and unless your plan is to OC it higher (>3.5GHz~4.0GHz+) than a current more less stock setting then leave it to Auto.
  19. overclocked cpu to 3.36 ghz yesterday worked fine but today computer restarted .i hadnt changed command rate .now changed command rate to 2t and trc from 34 to 41
  20. The only CAS Timings to modify are CAS-TRCD-TRP-TRAS-Command Rate leave the others to Auto.
  21. i ran prime95 and after 15 minutes there was blue screen in my windows and windows was stuck .. so i think it will not support in my pc . so i changed back to normal
  22. Assuming XMS (e.g. CMX4GX3M2A1600C9) is indeed DDR3-1600 9-9-9-24-2T @ 1.65v; I never saw a link or model number to your RAM.

    I took a look in your manual and as I mention way in the beginning use DOCP; note my first post #3. This I know works 'IF' the RAM is DDR3-1600 9-9-9-24-2T @ 1.65v:

    DIMM Slots:
    CPU: | 2GB | blank | 2GB | blank |
    CPU: | blank | 2GB | blank | 2GB |

    CPU OverClocking -> DOCP
    DRAM OC Profile -> DDR3-1600
    DRAM Timings /Enter
    DRAM CAS -> 9
    DRAM RAS to CAS -> 9
    DRAM RAS PRE -> 9
    DRAM RAS ACT -> 9
    DRAM Command Rate -> 2T

    DRAM Voltage -> 1.64v

    Save & Exit = yes

    Question, please provide a link to your EXACT RAM.
  23. my ram model number is CMX4GX3M1AC9 4 GB IN SINGLE SLOT

    this is the link of my ram i installed only one ram in on e slot is that he reason .... so i have only have to change the docp profile and no changing to cpu frequency and multiplier... earlier u posted ..
    1. CPU Host/Bus Frequency -> 240 (OC's your CPU so you'll need to (Phenom II X6 1090 3200MHz) set the CPU Multiplier 3200/240 = 14 (14*240MHz = 3.36GHz)
    2. CPU-NB Frequency -> 2400MHz ((DDR3-1600 / 2 = 800MHz) * 3)
    3. Some MOBO's e.g. ASUS offer 'DOCP' for setting RAM profiles, as I recall MSI doesn't off this nice and simple feature :(

    do i have to do all the changes in BIOS or only anyone of the above
  24. DOCP is the best option for your MOBO so yes. It shouldn't take longer than a minute, simpliest is to Load Optimized and make the changes. If you set AHCI the don't forget it.
  25. there is a link posted earlier its the details of my ram
  26. Could be but its not in this Thread. How's DOCP working?
  27. another thing is my motherboard says COPYING SPEED 6 gb/s but in windowscopying speed starts from 146mb/s and in the middle of the copying it shows 67mb/s
  28. Don't confuse Interface (6 Gb/s) with R/W speeds of the drives or forms of data.

    The best analogy is having a road (interface) with a Dragster vs Smart car, and being confused that the Smart car is a tad (being funny) slower. Windows copy speeds, readout, is induced initially by the 'Cache' of the drive (spike in speed) and then depending on the form of data and its' size will get slower and stabilize to the 'average' though the real speed is more less a constant.
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