1. Welcome to TechPowerUp Forums, Guest! Please check out our forum guidelines for info related to our community.

Difference between a 1333 fsb cpu on a 1333 fsb mobo and a 1066 fsb mobo

Discussion in 'General Hardware' started by BloodTotal, Jan 18, 2009.

  1. BloodTotal

    BloodTotal New Member

    Joined:
    Dec 16, 2007
    Messages:
    836 (0.35/day)
    Thanks Received:
    48
    Location:
    Canadia
    basically what would be the differnce between a cpu like an e8500 running on a p5b mobo, and running on a p5q mobo??

    thanks, if my post needs more clarification tell me
  2. erocker

    erocker Super Moderator Staff Member

    Joined:
    Jul 19, 2006
    Messages:
    39,489 (13.55/day)
    Thanks Received:
    13,900
    The 1066 motherboard would need to be overclocked to 1333 to run the chip at stock.
    BloodTotal says thanks.
  3. lemonadesoda

    lemonadesoda

    Joined:
    Aug 30, 2006
    Messages:
    6,242 (2.17/day)
    Thanks Received:
    963
    simply; the multiplier.

    cpus dont run at a fixed speed - they run at a multiple of the bus clock they are fed
    BloodTotal says thanks.
  4. Error 404

    Error 404 New Member

    Joined:
    Apr 14, 2008
    Messages:
    1,777 (0.78/day)
    Thanks Received:
    169
    Location:
    South Australia
    I don't think a CPU with a 1333 MHz FSB would run on a 1066 MHz FSB supporting motherboard anyway, unless it specifically said so in a CPU compatibility list (which should be accesible at the motherboard maker's website).
    For example, the motherboard in my second PC can't run any CPU with a FSB higher than 1066 MHz, because that is what the max FSB speed on the motherboard is.
    Most of the original 65nm Core 2 Duo supporting motherboards wont support the newer 45nm C2D CPUs, unless there is a BIOS update that will work with them.
    BloodTotal says thanks.
  5. erocker

    erocker Super Moderator Staff Member

    Joined:
    Jul 19, 2006
    Messages:
    39,489 (13.55/day)
    Thanks Received:
    13,900
    Sure it will run. It just won't run it at 1333 fsb and yes it does need be compatable. It can be compatable and still be a 1066 mobo.
    BloodTotal says thanks.
  6. Error 404

    Error 404 New Member

    Joined:
    Apr 14, 2008
    Messages:
    1,777 (0.78/day)
    Thanks Received:
    169
    Location:
    South Australia
    That is true, but it must be compatible, otherwise it wont run at all.
    BloodTotal says thanks.
  7. 3870x2

    3870x2

    Joined:
    Feb 26, 2008
    Messages:
    4,875 (2.09/day)
    Thanks Received:
    689
    Location:
    Joplin, Mo
    I think its like ram: it will underclock to the specification.
    BloodTotal says thanks.
  8. BloodTotal

    BloodTotal New Member

    Joined:
    Dec 16, 2007
    Messages:
    836 (0.35/day)
    Thanks Received:
    48
    Location:
    Canadia
    so overclocking a 1333 chip on a 1066 would be crap correct?
  9. Kursah

    Kursah

    Joined:
    Oct 15, 2006
    Messages:
    7,584 (2.68/day)
    Thanks Received:
    1,564
    Location:
    Missoula, MT, USA
    For 1333FSB you'd need 333 system FSB set in bios, 1066 is 266, etc. Many know this, but when you look at it that way, it's not that big of a deal. If the mobo in question does not support 1333FSB via stock standards, many will be able to hit that standard via OC. Some MB mfg's were nice enough to include said compatability in a simple bios update, some have ignored the spec, just depends on what you have.

    The difference between a P965 based P5B series and a P45 based P5Q series probably won't be too insane, I've had the Deluxe verisons of both, for me the P5Q Dlx has been the more stable board, but both were great OC-er's, both reaching 500FSB which would be 2000FSB by Intel's specs. But really I can't imagine any huge differences in overall performance, maybe some difference in memory bandwidth and latency, but even that would be minor I would imagine.

    :toast:
    BloodTotal says thanks.
  10. Error 404

    Error 404 New Member

    Joined:
    Apr 14, 2008
    Messages:
    1,777 (0.78/day)
    Thanks Received:
    169
    Location:
    South Australia
    Probably. You'd be better off getting a full speed motherboard, as the 1333 MHz motherboards usually support overclocking up to a 1600 MHz FSB, and maybe even further if you push it. Also, P45 is a more advanced chipset compared to the P965, so you might get a slight performance increase with it.
    BloodTotal says thanks.
  11. Pinchy New Member

    Joined:
    Apr 29, 2006
    Messages:
    5,109 (1.71/day)
    Thanks Received:
    284
    Location:
    Sydney, Australia
    Well...

    I have my e8500 in both a P5Q-e and P5B Dlx (currently using in the P5B dlx).

    Has no probs hitting 4GHz on the P5b, havent tried pushing it further.

    On the P5Q, I have hit 4.5-4.75GHz stable, but as I said, havent tried on the P5b yet.
    BloodTotal says thanks.
  12. BloodTotal

    BloodTotal New Member

    Joined:
    Dec 16, 2007
    Messages:
    836 (0.35/day)
    Thanks Received:
    48
    Location:
    Canadia
    so what exact performance boost would happen going from a p35 to a p45 *specifically for the CPU*

    it would run 1333 natively, but would it overclock better?
  13. BloodTotal

    BloodTotal New Member

    Joined:
    Dec 16, 2007
    Messages:
    836 (0.35/day)
    Thanks Received:
    48
    Location:
    Canadia
    very good to know, big thanks

Currently Active Users Viewing This Thread: 1 (0 members and 1 guest)

Share This Page