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Core i7 930 Voltage/OC Questions...Is Bloomfield Overvolted by Default?

post #1 of 11
Thread Starter 
To begin, I've read lots of different guides on this awesome forum and you guys have done quite a bit of good work. I've also realized that there is a heck of a lot of variation among the 920 DOs and 930 DOs with earlier ones running a lower voltages. I've got some observations and questions below based on my limited experiences and I'm hoping you can help me out.

My Gigabyte GA-X58A-UD3R (FE BIOS) shows normal core voltage of 1.275 for my i7 930 DO (Batch 3008A997). If I enable LLC at Level 1 (which is what I've had it at always), normal core voltage shows 1.2125 in BIOS.

At 3.8 GHz (HT on), I've been able to get 10 runs of IBT maximum stress on 8 threads and 45 minutes (no crash, just didn't test any longer) of Prime 95 Large FFTs with 1.20625 core voltage. BTW, VTT stays set at 1.255 and DRAM voltage is at 1.6. RAM is at 1440 with fairly loose timings (auto). Everything else is at auto. CPU-Z shows vcore of 1.20 at this setting and drops to 1.84 under load. LinX failed on run number 3 at this setting due to an error, the PC didn't crash. Max temps hover around 70 C for the hottest core with an ambient temps of 21.5 to 23.9. If I lower vcore to 1.20 in BIOS, I BSOD under load at 3.8 GHz, so I know that vcore is too low for my chip, right? I haven't tried bumping VTT any further.

With all the same settings as above at 3.8 GHz, except for vcore being set to 1.2125, I get overnight stability with Prime 95, 10 runs of IBT max stress, and 20 runs of LinX problem size over 25000, max settings. So I feel like 1.2125 is a good vcore. CPU-Z shows 1.84 vcore under load.

All this begs the questions:

1. Why is this chip set to 1.275 as normal in BIOS?
2. Does LLC level 1 do that much?
3. Is CPU-Z showing me significant Vdroop? (1.2125 to 1.84)
4. I'm looking to set up a stable 4.0 OC and I'm hoping I can get there with not much more voltage. 1.2125 definitely doesn't cut it with all other settings the same. Do you have any advice on how much I should bump vcore and/ore DRAM, PLL, VTT?

Thanks in advance for any advice.
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post #2 of 11
Thread Starter 
Well, 1.25 doesn't work @ 4.0 with LinX on max. Well, it worked until I touched the mouse.
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post #3 of 11
Quote:
Originally Posted by breenemeister View Post
Well, 1.25 doesn't work @ 4.0 with LinX on max. Well, it worked until I touched the mouse.
You may need to a bit higher. My old 920 needed 1.3125v for 4 GHz.
    
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post #4 of 11
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Quote:
Originally Posted by sch010 View Post
You may need to a bit higher. My old 920 needed 1.3125v for 4 GHz.
Well, I hope I don't have to go quite that high, but I'm definitely going higher tomorrow. Thanks for the response. Do you have any other wisdom as to other settings such as PLL, VTT, etc?
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post #5 of 11
Quote:
Originally Posted by breenemeister View Post
Well, I hope I don't have to go quite that high, but I'm definitely going higher tomorrow. Thanks for the response. Do you have any other wisdom as to other settings such as PLL, VTT, etc?
What VTT are you using for 6 DIMMs now? I would try to stay around or below 1.35V
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post #6 of 11
Quote:
Originally Posted by breenemeister View Post
Well, I hope I don't have to go quite that high, but I'm definitely going higher tomorrow. Thanks for the response. Do you have any other wisdom as to other settings such as PLL, VTT, etc?
Eh, don't worry too much about it. Most people try to stay below 1.375v, so you've got a ways to go yet. As others have said, keep VTT below 1.35v if you can, though really as long as vDIMM and VTT are within 0.5v of each other, you're probably all right. I wouldn't touch the PLL, though undervolting it somewhat is (or at least was) speculated to have some beneficial impact.
    
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post #7 of 11
Thread Starter 
Quote:
Originally Posted by Skripka View Post
What VTT are you using for 6 DIMMs now? I would try to stay around or below 1.35V
I'm running 3 DIMMs at 1.255 VTT right now.
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post #8 of 11
Thread Starter 
Quote:
Originally Posted by sch010 View Post
Eh, don't worry too much about it. Most people try to stay below 1.375v, so you've got a ways to go yet. As others have said, keep VTT below 1.35v if you can, though really as long as vDIMM and VTT are within 0.5v of each other, you're probably all right. I wouldn't touch the PLL, though undervolting it somewhat is (or at least was) speculated to have some beneficial impact.
I did see something about undervolting the pll in another post and wondered if that was a universal thing or not. Like you said, I'd like to leave most of that stuff alone. It's kind of splitting hairs. I'm sure I can get stable but I would like to be somewhat efficient to avoid heat. Thanks for the heads up.
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post #9 of 11
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Just finished an 18 hour P95 run (large FFTs) at 3.8 with vcore set to normal (1.2125). No problems, but then I looked before I closed P95 and darn if there wasn't an error on one of the workers on 30 minutes into the game that shut that worker down. Guess I'll have to do it again tonight.

On another note, my PC makes a nice space heater with the door closed. Ambients went from 22.9 to 26.8. Max temp on the hottest core was 73 with an average of 71 over all cores.

I've never had a P95 error before, only BSODS when I didn't have enough voltage. Do you guys think there is an issue I need to look into regarding that?
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post #10 of 11
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Finished another overnight 3.8 GHz run of P95 Large FFTs at vcore 1.2125. This time no errors in P95. Max temps 71 69 70 69 for an average of 69.75 with ambient temps from 23.3 to 25.6. Gonna run Small FFTs tonight.
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