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Thread: Mixing 6400 with 5400 ...

  1. #1
    Join Date
    Jan 2005
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    Mixing 6400 with 5400 ...

    My system has 1GB of TWIN2X1048-5400C4PRO.
    It is not overclocked and the frequency is set to Auto in BIOS setup (so it might be running at 667MHz ? how can I check it ?).
    I plan to upgrade RAM to 3GB.
    A matching 2GB of TWIN2X2048-5400C4PRO appears to be at the same price as TWIN2X2048-6400C4PRO.
    Therefore I prefer to get the 6400 version (so that in the next system I could stick to 6400).
    Can I "mix" 6400 with the existing 5400 ?
    I think I can but I need to get the frequency set "correctly".
    Would I need to change Auto setting in BIOS to a specific value so that both banks are accessed at the same pre-set speed ?
    I may consider overclocking 5400 a bit to 711MHz. Clearly 6400 would cope with it without any problems. Would this cause any imbalance ? Shall I stick to nominal 667MHz for 5400 ?

    Thanks and Regards


    August VI (my wife's system) : Dell Inspiron XPS M2010 , Intel Core 2 Duo T7200, 2GB 5300 (667) RAM, single HD 120GB, 256MB ATI Mobility RADEON X1800, 20.1" WSXGA
    August V (my main system, custom rig) : Asus P5AD2-E Premium 925XE, Intel P4 550 3.4GHz, Corsair TWIN2X2048-6400C4PRO 2GB [Corsair TWIN2X1048-5400C4PRO 1GB], XFX GF 8800 GTS 640MB [Asus EN6600GT-TD 128MB], 2x WD Raptor 74GB in RAID0, 2x Seagate Barracuda 7200.7 200GB in RAID0, NEC ND-3520A black, Sony CRX320E black, Mitsumi FA404M FDD + 7in1 card reader black, Enermax Noisetaker EG701AX-VE 600W, CM Stacker STC-T01 silver with cross flow fan, Akasa Fan Controller, Thermaltake smart blue LED fans, Iiyama ProLite E481S, MS Windows XP Pro, built Feb 2005, RAM + GPU upgraded Mar 2007
    August IV (retired) : upgraded Compaq DeskPro 575 (replaced CPU, added : RAM, graphic card, sound card, modem, HD, CD-ROM)
    August III (given away) : PC AT
    August II (retired) : Atari STM 520kB, monochrome monitor SM124
    August I (retired) : ZX Spectrum Plus

  2. #2
    Registered User Yellowbeard's Avatar
    Join Date
    Oct 2006
    Atlanta,GA, USA.
    74 times in 67 posts
    CPU-Z is a good tool to check your CPU speed, memory timings etc. It's free.

    As far as your plan for 3gb, the only thing to do really is to buy and test. The 2 different types of memory may or may not run well together but you cannot know until you install them and test it. If they do not run well together, I would suggest simply using 2 x 1gb and finding another use for the PC5400.

    Also, I would suggest setting your memory timings manaully to 4,4,4,12 or 5,5,5,15 if you get instability. Also, set memory voltage to 2.1v.

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