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Recent content by cec1l

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    Intel Core i7 920 Overclocking and Heat @ [H]

    Update, I realized I could use less voltage for 4ghz after 4.2ghz tested stable on air (in super low ambients, super low ambients for this new result also): 21x190 3.99ghz, turbo on, HT on, 1.3125v load, 1.328v idle, 1.315 VTT, 3420mhz QPI, 3040mhz Uncore, 1520mhz memory @ 8-8-8-21-2T with...
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    i7 920 first attempts

    Use CPU-Z to verify your actual Uncore and QPI speeds. By far the easiest way to hit 3.8ghz is to use 21x181 by enabling turbo. If your RAM isn't able to do 1448mhz (181 bclk @ 8x mem multi) you will have to set the memory multi to 6x for 1086mhz and set the Uncore multi to 12x which is the...
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    Intel Core i7 920 Overclocking and Heat @ [H]

    This is the farthest I'm willing to push the chip on air, and even then just to see what it can do in case I want to improve my cooling setup: i7-920, 3841A383 from Newegg: 21 x 200 4.2ghz, turbo on, HT on, 1.408v load, 1.424v idle, 1.395v VTT, 3200mhz Uncore, 1600mhz memory @ 9-9-9-24-2T...
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    i7 temps with memory voltage

    Yes, we are using up to 2.0v in some cases. The highest I have gone so far was 1.8 trying to get 3600mhz Uncore stable with 4.2ghz with HT running 8 thread software. The key is to keep QPI/VTT within 0.5 volts -max- from the DRAM voltage. The max recommended value for QPI/VTT is 1.35v by...
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    Core i7 OC with 3 x 2gb @ 1T command rate

    A quick tip if you are having trouble with overclocking stability with 3 x 2gig sticks on your Core i7 system: ditch 1T command rate. I'm not losing performance from it, just gaining instability with it at high BCLKs with 3 modules. It's fine for 2 modules for my system however. I started...
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    I7 940 OC help

    I haven't seen any data to indicate that yet. I am diligently raising VTT one step at a time until it's stable with 6 gig triple channel in Prime blend. I needed 1.275v VTT for 4 gigs dual channel and with all the same settings except the added third memory stick I am now up to 1.395v VTT and...
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    Max VS min VID

    Did you lower your Uncore multiplier? Also you need to raise QPI (VTT) voltage as you stress the memory more. I just had to go from 1.275v to 1.375v VTT to get stability back when I went from dual channel to triple channel at 3.8ghz with HT. At 4.0ghz with HT I already needed 1.375v VTT with...
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    I7 940 OC help

    It will go into the 80s for LinX (or similar torture test) if you use all the memory you can get away with. I seem to be getting similar temps to you with my TRUE-120 2100rpm push-pull but I have my board mounted to the removable tray from my case laying flat on a table with ceiling fan...
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    I7 940 OC help

    Yep, I don't believe you. Get RealTemp version 2.90, it reads higher than 2.70.
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    I7 940 OC help

    I'm assuming you have HT enabled because you are unstable at 1.35 vCore. Try lowering CPU PLL back to default. What was your reason to raise it? I don't think there's any conclusive evidence it's helpful on the i7 platform yet (at 20x200). Also increase your vCore to at least 1.375v in the...
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    i7 920 max bclk on AIR = 230Bclk

    Very impressive. Your DFI board seems to have more useful settings for voltage than my Gigabyte. :( I am unable to boost at 210 BCLK no matter what the multi or Uncore/Memory speeds or timings. I am very stable at every variation of 200 BCLK however. Is it true that to go much past 200...
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    A tale of three 920's and their OC results

    I think I've seen people get 19x211 stable on the Gigabyte boards but I don't know how they did it. I've been stable at 20x200 since BIOS F5a. I've used 19x191 with turbo which is another interesting option and stable but I'd like to dial in 19x211 with no turbo if I can!
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    A tale of three 920's and their OC results

    When you first tried 20x200 @ 1.40000v bios did you have your vQPI up to 1.355 already? Try 1.375v QPI with 20x200 if you haven't yet.
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    A tale of three 920's and their OC results

    Try lowering your UCLK to 200 and using turbo to reach 4.2ghz instead. This will relieve the stress on the memory system and should allow lower volts (on QPI for sure, should also get a few steps on vCore) so you can get the temps down a bit. I am also able to run with 8-8-8-21-1T since I'm...
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    Question about overclocking the i7

    I agree, maybe I should have said I agreed with a ~1.35-1.45v limit depending on cooling for 24/7 reliability. I am using 1.264 load (1.30 BIOS) for 4ghz no HT (sigh, up from 1.244 which was stable with colder ambients). With HT I'm using 1.360 load (1.40625 BIOS). I wonder if the ~0.1 volt...
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