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Thread: Overclocking Thread about LGA 771 CPU on LGA 775 Mobo

  1. #1
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    Overclocking Thread about LGA 771 CPU on LGA 775 Mobo

    The same old sh*t to start a new thread for 'wyt' ( 'wytiwx' ).
    Team China


  2. #2
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    THX, man. I'm coming.

    I think I love the old school overclocking things, the first step was Celeron D, now this is the second step.

    LGA771 CPU for LGA775 Mobo mod is not my original thing, I just do this for interest, and I mean no offense.

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    We know that many LGA771 CPU s and LGA775 CPU s were made from same wafer.

    They can have the same CPUID, same stepping, same cache size, same CPU Features, even same FSB and Freq, the only one different thing is Socket type.

    So it's not so difficult for LGA771 CPU to work on LGA775 Mobo, right?

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    This is top view of two CPU.




    The bottom view




    Processor Land Coordinates




    See? Most of Socket Pins are the same definitions, functions and positions.

    That's the good news to mod work.

  5. #5
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    Next step is to check socket pin land assignment one by one.

    There are about 76 different pins between LGA771 and LGA775, but many pins are 'RESERVED', 'TSETHI', 'COMP' and 'FCxx' pins, which can be ignored in many cases.

    LGA775 socket have 8 pins more than LGA771 socket, these pins are Power pins, like VCC, VSS, VTT.

    LGA771 socket have 4 pins more than LGA775 socket, these pins are Power pins too.

    It doesn't matter for losing some Power pins.

    According to someone's testing result, the most important pins are two address pins:



    For LGA771 CPU, land name A3# is Execute BIST (Built-In Self Test), it's pin No. M5 on LGA771, but this A3# pin is pin No. L5 on LGA775.

    So the key is to exchange pin M5 and L5. Thank God, pin M5 is adjacent to L5.

    Get this done first!

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    You keep blowing my mind with these kind of things man...In before greatness

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    Quote Originally Posted by Ivanlabrie View Post
    You keep blowing my mind with these kind of things man...In before greatness
    Old, but still charming.

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    Here we go.

    LGA771 CPU Pinmod first.














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    Second thing is LGA775 Mobo mod.








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    Third thing is to use software like CBROM (for Award BIOS) or MMTOOL (for AMI BIOS) to check your Mobo's BIOS, find if BIOS has the CPUID of LGA771 CPU.

    In many cases, the Mobo already has many CPUID codes, I won't take my time to explain how to check and insert the CPUID codes.

    You can get more info about LGA771 CPU in this website: http://www.cpu-world.com/

    What am I waiting for? Nothing.

    Go go go!
    Last edited by wytiwx; 04-01-2013 at 08:58 AM.

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    Work by wytiwx, using Intel LGA775 stock air cooler.

    Intel Xeon 5050 http://www.cpu-world.com/CPUs/Xeon/I...5555050P).html





    Valid URL: http://valid.canardpc.com/show_oc.php?id=2752641

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    Work by wytiwx, using Intel LGA775 stock air cooler.

    Intel Xeon 5110 http://www.cpu-world.com/CPUs/Xeon/I...5565110P).html




    FSB 585 done, Mobo limit, I think.




    Valid URL: http://valid.canardpc.com/show_oc.php?id=2752349

  13. #13
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    Work by wytiwx, using Intel LGA775 stock air cooler.

    Xeon X5260 http://www.cpu-world.com/CPUs/Xeon/I...73KJ0936M.html



  14. #14
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    Take a break
    Last edited by wytiwx; 04-10-2013 at 05:42 AM.

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    Work by thepounds.















  16. #16
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    Work by ban.

    Mobo: P5K-E/AP-WiFi.


  17. #17
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    Work by lx2010.





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    I will make some Extreme Cooling result when I get back to my lab.

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    Wow you guys are going super hard on 775, pin modding and all.

    I am sure the 771 cpus have to be pretty cheap nowadays.
    Quote Originally Posted by Hondacity View Post
    gskillllin it!

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    Quote Originally Posted by l0ud_sil3nc3 View Post
    Wow you guys are going super hard on 775, pin modding and all.

    I am sure the 771 cpus have to be pretty cheap nowadays.
    I've seen refurbed 771 quad cores(E5405-5440) for 13-19.99 per chip. E5450-X5472's range from 40-100 per chip. I managed to snag a pair of used X5472's for $40 on eBay, but that was just a very lucky snag.
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    Xeon 5110 FSB 595MHz done. Should try a P45 board, I think.





    Valid URL: http://valid.canardpc.com/show_oc.php?id=2754732

  22. #22
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    I love your threads wytiwx, knowledge sharing at its finest!
    Overclocking, it's a lifestyle

  23. #23
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    Quote Originally Posted by l0ud_sil3nc3 View Post
    Wow you guys are going super hard on 775, pin modding and all.

    I am sure the 771 cpus have to be pretty cheap nowadays.
    Some slow 771 chips (Like E5110) were hard to sell when I had bulk server chips even 4-5 years ago for ~$15-20 a pop.

    They don't even list them anymore on eBay much it looks like, but I have contacts that will sell for $1/ea.
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    Quote Originally Posted by Calathea View Post
    I love your threads wytiwx, knowledge sharing at its finest!
    THX, man.

    Overclock everything!

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    Quote Originally Posted by tool_462 View Post
    Some slow 771 chips (Like E5110) were hard to sell when I had bulk server chips even 4-5 years ago for ~$15-20 a pop.

    They don't even list them anymore on eBay much it looks like, but I have contacts that will sell for $1/ea.
    Yep, for many friends, it's not so easy to get LGA771 CPU s nowadays.

    Lucky I'm in China, a magical place

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