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Thread: REQ: EP45-UD3R--which OC's Quad-core CPU?

  1. #11

    Default Re: REQ: EP45-UD3R--which OC's Quad-core CPU?

    Quote Originally Posted by Psycho101 View Post
    You've definitely made a good choice for your Quad. It's worth noting that you should get a decent amount for your E7200 on eBay too.
    Keep us posted on how your build goes. Like Lsdmeasap says, the switch over won't need a re-install of the OS. In some cases though, Windows stores a value in the registry telling it how much L2 cache is onboard. The E7200 has 3MB shared but the Q9550 has a whopping 4 times as much meaning 12MB of shared L2 cache. It would be wise to change this value to the correct amount. It's only polled if the HAL (Hardware Abstraction Layer) can't report the correct amount to either Windows (uncommon) or a program (more common especially with older programs). The guide on how to change it is here: CPU L2 Cache Memory setting in Vista - Vista Forums
    It's a guide I used myself, very well written.
    Thanks for the pointer. Right now I'm using XP Pro (32-bit) so I'm not sure that guide would help. I'm going to make another HD partition and install Windows 7 RC to play with, so it should read the proper CPU information. I'm just wondering what the CPU changeover will do to my OS X 10.5.6 install...

  2. #12
    Join Date
    Apr 2009
    J'Habite En Angleterre

    Default Re: REQ: EP45-UD3R--which OC's Quad-core CPU?

    If there is a coresponding tweak for XP (I think there is) then it would be agood idea to use that. They handle L2 cache in roughly the same way.

    I'm going to make another HD partition and install Windows 7 RC to play with, so it should read the proper CPU information.
    Maybe, maybe not. I use Win7 and had to apply the tweak as only 256K of my L2 cache was being utilized (checked in performance/hardware report). If Windows has no problem accessing via the CPU detection routine (Using HAL) that's fine, but setting the registry flag makes sure both Windows and any programs that bypass HAL definitely utilize the maximum amount.

    I've never used OS X, so I can't really say how it reacts to a CPU replacement. If OS X has something similar to device manager you may want to delete/uninstall the CPU in OS X, to let it re-detect the CPU when you next boot.
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