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Thread: So this has been bugging me...

  1. #1
    Headless Chicken Terbinator's Avatar
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    Question So this has been bugging me...

    What does the P55's use to connect/transfer to RAM - its own type of QPI between the IMC and RAM or something else. Just curious that's all as I cant seem to find a definitive answer anywhere on the web.
    Kalniel: "Nice review Tarinder - would it be possible to get a picture of the case when the components are installed (with the side off obviously)?"
    CAT-THE-FIFTH: "The Antec 300 is a case which has an understated and clean appearance which many people like. Not everyone is into e-peen looking computers which look like a cross between the imagination of a hyperactive 10 year old and a Frog."
    TKPeters: "Off to AVForum better Deal - £20+Vat for Free Shipping @ Scan"
    for all intents it seems to be the same card minus some gays name on it and a shielded cover ? with OEM added to it - GoNz0.

  2. #2
    Senior Member Pob255's Avatar
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    Re: So this has been bugging me...

    Umm AFAIUnderstand nothing, on a p55 chipset motherboard the cpu is directly linked to the memory and the pci-e graphics slots by a QPI path in the PCB.

    So to load data from the hard drive into the memory, the cpu sends the command to the chipset (via a QPI) to access the data from the hard drive, the data it then shunted by the on die memory controller into the memory via the memory pathway QPI


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  4. #3
    Senior Member kalniel's Avatar
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    Re: So this has been bugging me...

    Quote Originally Posted by Terbinator View Post
    What does the P55's use to connect/transfer to RAM - its own type of QPI between the IMC and RAM or something else. Just curious that's all as I cant seem to find a definitive answer anywhere on the web.
    Wires! (Well, etched lanes in the motherboard PCB between the sockets to be more accurate).

    There's no transfer protocol (ie QPI or DMI) between the memory sockets and the CPU socket because it's controlled on die at the CPU. There's no defined protocol between the IMC and the rest of the CPU die either (well, apart from 'dual channel DDR3')



    If you need to define a protocol then it's dual channel DDR3. But really, it's better to think of the memory as literally being plugged into the CPU and it's just physically extended away with 'wires' for space reasons.

    Quote Originally Posted by Pob255 View Post
    Umm AFAIUnderstand nothing, on a p55 chipset motherboard the cpu is directly linked to the memory and the pci-e graphics slots by a QPI path in the PCB.

    So to load data from the hard drive into the memory, the cpu sends the command to the chipset (via a QPI) to access the data from the hard drive, the data it then shunted by the on die memory controller into the memory via the memory pathway QPI

    Nope - no QPI at all on p55. QPI is a serial transfer protocol, like hypertransport. It would need logic at the receiving end to work with it, but RAM doesn't contain it, nor does the rest of the chipset in the p55s case. As your diagram shows, the CPU talks to the southbridge over DMI, not QPI.
    Last edited by kalniel; 08-07-2010 at 08:39 AM.

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    Pob255 (08-07-2010),Terbinator (08-07-2010)

  6. #4
    Headless Chicken Terbinator's Avatar
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    Re: So this has been bugging me...

    While i appreciate your attempt Pob i already knew that (). Kalniel sort of answered my question which i guess really didn't have an answer.

    Cheers anyway guys.
    Kalniel: "Nice review Tarinder - would it be possible to get a picture of the case when the components are installed (with the side off obviously)?"
    CAT-THE-FIFTH: "The Antec 300 is a case which has an understated and clean appearance which many people like. Not everyone is into e-peen looking computers which look like a cross between the imagination of a hyperactive 10 year old and a Frog."
    TKPeters: "Off to AVForum better Deal - £20+Vat for Free Shipping @ Scan"
    for all intents it seems to be the same card minus some gays name on it and a shielded cover ? with OEM added to it - GoNz0.

  7. #5
    Senior Member Pob255's Avatar
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    Re: So this has been bugging me...

    I should of known form the diagram I posted

    What I was saying was basically right, the memory and pci-e are directly connected to the cpu, I just got what a QPI is wrong

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