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Thread: [THANK YOU] Successful CPU Upgrade, redid my OC based on techniques learned here!




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    Thumbs up [THANK YOU] Successful CPU Upgrade, redid my OC based on techniques learned here!

    A while back, I posted a thread about having some trouble overclocking my Core i7-930 to 4.0 GHz on my GA-X58A-UD5 (rev.1). I got a good bit of help from the community in reaching my target speed, and learned a lot along the way.

    I learned the importance of the QPI/VTT voltage (QPI/VTT impacts the uncore and IMC portions of the CPU; arguably more important than Vcore). I learned that the IOH may need a little more voltage to keep up with the QPI, if you overclock the uncore / IMC. I learned that 4GB DIMMs put added stress on the IMC, and that the QPI/VTT voltage will need to be bumped up slightly to make up for it.

    I also learned that if your DIMMs are specc'd to handle DDR3-1600 @ 1.5V, and you are not going to push them past that, you will NOT need to increase Vdimm past the stock voltage. Instability on this front generally comes from the uncore, not the RAM.

    Last Monday, so 9 days ago, I upgraded from that i7-930 to an i7-980X. In doing so, I had to start my overclock from scratch (different transistor size, different voltage requirements, etc.). Having changed nothing else, but following the techniques I was taught by the community, I am sitting 100% stable at 4.20 GHz (200x21). The system couldn't be happier!

    So, thanks to everyone here. Thanks for teaching people how to OC better. Thanks for the feedback. Thanks for the encouragement. Most of all, thanks for the patience.

    If anyone wants to see a BIOS template for my OC, I'm happy to post one as soon as I get the chance this evening. Can't bring up my BIOS settings from the office...

    I installed the i7-930 in a brand new mATX rig (ASUS RAMPAGE III GENE, but only because Gigabyte doesn't offer an X58 mATX board), where it is happily running at the same 4.0 GHz (191x21) as before.
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    Acebmxer's Avatar
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    Default Re: [THANK YOU] Successful CPU Upgrade, redid my OC based on techniques learned here!

    Make sure you know that the 980x has a different uncore rule then your 930. You only need 1.5x +1 or +2 memory multi.
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    Default Re: [THANK YOU] Successful CPU Upgrade, redid my OC based on techniques learned here!

    Great to hear you have updated your CPU and learned so much reading here!!

    Acebmxer is correct, you do not have to use 2x ram multi for uncore on 980X, but you still can if you want.

    That just makes it easier to use lower when pushing high memory clocks, or if you want to use less QPI/Vtt you can lower Uncore multi, but that does affect performance negatively so keep in mind when trying to decide/tweak.

    Post back anytime!

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    Default Re: [THANK YOU] Successful CPU Upgrade, redid my OC based on techniques learned here!

    I went for the 2x multiplier for the uncore specifically for the added performance. I am not overclocking my memory at all, so I want to eek out as much performance from the controller as I can. I don't see much of a reason to go above bclk 200. I did hit bclk 210, 100% stable, but I backed down to 200 once I tried to get my multi over 18.
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    Default Re: [THANK YOU] Successful CPU Upgrade, redid my OC based on techniques learned here!

    I use 2x too on 980X, sometimes I still use 2x +2 as well, the performance is not so hot if you use 1.5x

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    Default Re: [THANK YOU] Successful CPU Upgrade, redid my OC based on techniques learned here!

    Agreed. I noticed a significant increase in a semi-realistic (read: real-game-based) benchmark score for having 2x versus 1.5x, which makes me not want to go below 2x. As I understand it, 1.5x is only to improve memory controller stability when you have a heavy uncore bclk and RAM overclock. In my experience, if the uncore is at around 3200 MHz, it is perfectly stable. Any higher, and you'll have to work to stabilize it. Any lower, and performance will suffer. This means you can get full performance out of DDR3-1600 by running the bclk @ 200 MHz, the uncore multiplier at 16x, and the memory multiplier at 8x. This will achieve a zero overclock on the DDR, and no real overclock on the uncore either, while maximizing the CPU overclock by way of the bclk. I prefer this to using a higher CPU multiplier whenever possible. Unfortunately for me (and other 980X owners) it means that I never make use of the unlocked multiplier, as even matching the stock multi (25) at bclk 200 means the CPU would run at 5.0 GHz... which is way too much for a reasonable cooling solution to handle. The voltage requirements would be astronomical.

    Conclusion: If you want to hit bclk 200 on a 32nm, hex-core processor, go for the 970 rather than the 980X. You'll hit the same speeds, but save about $150.
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    Default Re: [THANK YOU] Successful CPU Upgrade, redid my OC based on techniques learned here!

    I run 4.2Ghz (168x25) on 980X without issues, uncore at 3.6-3.8 depending on what ram clocks I am using, and I have no stability issues with that.

    If you want helping with your 980X Kaishi let me know.

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    Default Re: [THANK YOU] Successful CPU Upgrade, redid my OC based on techniques learned here!

    Quote Originally Posted by Lsdmeasap View Post
    I run 4.2Ghz (168x25) on 980X without issues, uncore at 3.6-3.8 depending on what ram clocks I am using, and I have no stability issues with that.

    If you want helping with your 980X Kaishi let me know.
    I'm always interested in eeking out a little more performance but as I said, I'm at 4.2 GHz myself: 200 x 21. My uncore is at.... 3.2 I think, but I might be able to get it a little faster. RAM is at stock: 1600 MHz (8x Multi). I really should just write up a full template... I'll do that this afternoon.
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    Default Re: [THANK YOU] Successful CPU Upgrade, redid my OC based on techniques learned here!

    x17-x18 uncore should be easy for you to get going then, and it will give you a good boost in memory performance too.

    If you try it, the key thing you may need to increase is QPI/Vtt voltage

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