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post #421 of 560
Actually, I just tried 182x22 with a fixed voltage, but turned on EIST. What was different this time was going into Control Panel > Power Options > High Performance > Change plan settings > Change advanced power settings > Processor power management > Minimum processor state > Setting 5%, as unclewebb suggested in another forum. That actually worked: my power use and cpu multiplier dropped when the computer was not working hard.

Also, my current setup uses Real Temp to allow all four cores to go to 30x on load. This means that with a bclk of 134MHz I get up to 4020MHz on load, but only 1206MHz on idle. It's very nice.

Bottom line: I'm doing this with a Gigabyte board.
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post #422 of 560
That's great, but did your voltage drop as well? I'm not saying that the Asus boards are better than the Gigabyte boards, but just that I'd like to be able to have the processor multi's drop (when not under load), and the voltage as well.
    
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post #423 of 560
Yes. My voltage dropped. Everything worked as it is supposed to work. That Windows setting really does the trick.
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post #424 of 560
Quote:
Originally Posted by ehume View Post
Actually, I just tried 182x22 with a fixed voltage, but turned on EIST. What was different this time was going into Control Panel > Power Options > High Performance > Change plan settings > Change advanced power settings > Processor power management > Minimum processor state > Setting 5%, as unclewebb suggested in another forum. That actually worked: my power use and cpu multiplier dropped when the computer was not working hard.

Also, my current setup uses Real Temp to allow all four cores to go to 30x on load. This means that with a bclk of 134MHz I get up to 4020MHz on load, but only 1206MHz on idle. It's very nice.

Bottom line: I'm doing this with a Gigabyte board.

I knew you could get it working how you wanted, well you will still have to use that same method with a higher Bclk if you want the memory faster. Honestly though, slower memory speed might be better anyway as long as you use the tightest timings that you can get stable.
    
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post #425 of 560
Quote:
Originally Posted by ehume View Post
...Vdimm (DRAM) is set to 1.62v, runs at 1.616v...
...Max temp hit 79c. Then BSOD = 0x00000101, which means insufficient Vcore....
So for a true novice here, can you help me understand?

I have the following memory (each pair in a separate bank...)

OCZ Reaper Edition 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Desktop Memory Model OCZ3RPR1333C9LV8GK62991272

OCZ Gold 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Low Voltage Desktop Memory Model OCZ3G1333LV8GK62896035

I had to go with the OCZ Gold for the bank with the DIMM slot closest to the processor because the Thermaltake Frio overlaps that first slot and the Reapers have these odd heatpipes and cooling plates that rise up 2" off the DIMM. The Gold just have normal heat spreaders and thus I could fit one under the Frio with room to spare (just to make sure I added the DIMM only AFTER the CPU and heatsink were all bolted in place.)

That doesn't mean that I don't have a possible cooling issue with that DIMM that's closest to the CPU...

I can't seem to OC the memory beyond 1333MHz at all. No amount of voltage seems to make any difference.

On the other-hand, I can underclock them and utilize lower latencies and that seems to work fine.

I'm currently at 4074 MHz on all four cores (194x21), TB disabled, C1E, C3/6, and EIST enabled. Running RealTemp to measure the temperatures and running a full 20 pass LinX peaks out at 94C, 93C, 89C and 90C (cores 1,2,3,4.) I know that's too hot, and if I drop back on the FSB just a couple of MHz the temps drop dramatically.

At 4011 (191X21) I never see higher than 84C on any core.

So my questions are:

1) What's up with the memory, and why can't I OC it at all? I've got the multiplier at 6X for a memory speed of 1164 MHz (194x6) with timings of 8-8-8-20. Voltage is left at AUTO, and per CPUID Hardware Monitor Pro it's running at 1.54v under load. The DIMMs are all labelled 1.65v and 9-9-9 timings (I assume at 1333 MHz.) Even to get a stable QPI/Vtt I'm at 1.39v otherwise BSoD. The BSoD for too low of QPI/Vtt appears to be 0x00000124, correct? (And too little Vcore is 0x00000101 as stated above?)

2) Since I can run six hours straight with the cores not getting over 94C, is that a safe situation given that this is not a gaming machine. I'm using it as a kick-a$$ daily workstation, so I rarely am using even a fraction of the power. It's just cool to know that it's there...

3) Or would I be better off dropping back to 191x21 = 4011 MHz so that I have another 10C of headroom? I can run the QPI/Vtt at a little lower 1.37v here without issue.

4) For my needs, would I see more of a difference in daily use with the bclk back at 133, thus the memory at 1333 MHz and the multiplier at say 30x? I could then leave the QPI/Vtt stock without issue.

Thanks in advance for all of your help! My last serious overclocking was with the 486/33, hitting 40 - 42 MHz. Back then the test to see if it was too hot was to hold your thumb on the CPU and if you could stand the heat you were good to go. If you couldn't take the pain, back off 1 MHz.

Stephen

PS: My apologies also for getting OT from the 875... If this is too general a posting I'll take it to another forum. Thanks.
Edited by skfurr - 10/12/10 at 6:56am
    
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post #426 of 560
Quote:
Originally Posted by skfurr View Post

Stephen

PS: My apologies also for getting OT from the 875... If this is too general a posting I'll take it to another forum. Thanks.

(I cut off most of the quote to save other scrolling time)

Stephen,

Welcome to the group man. My first suggestion is to remove one of the sets of memory and see what kind of stability you can get with just 8GB in the system. 16GB is a lot (imo) for these chipsets to handle (especially when being OC'd). I usually feel that running 8GB (as I do) is overkill. However, to each their own. But try removing the OCZ gold sticks, and see what happens then.

Also note: I've recently learned (from testing on my rig) that upping the PLL voltage from 1.8v to 1.9v allowed me to drop my IMC voltage quite a bit and remain stable. I think this might have to do with filling all 4 ram slots, but am not sure.

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post #427 of 560
Quote:
Originally Posted by Ransom View Post
Welcome to the group man. My first suggestion is to remove one of the sets of memory and see what kind of stability you can get with just 8GB in the system. 16GB is a lot (imo) for these chipsets to handle (especially when being OC'd). I usually feel that running 8GB (as I do) is overkill. However, to each their own. But try removing the OCZ gold sticks, and see what happens then.

Also note: I've recently learned (from testing on my rig) that upping the PLL voltage from 1.8v to 1.9v allowed me to drop my IMC voltage quite a bit and remain stable. I think this might have to do with filling all 4 ram slots, but am not sure.

Ransom
Thanks for the warm welcome!

Good idea with the KISS approach and 2 vs. 4 DIMMs. The only reason I went full bore was that I found on the laptop I was using before (Core2Extreme 2.8 GHz and 8GB RAM) that I would often find myself using 7+ GB between email, browsers and a couple of virtual machines going. I thought since memory has gotten so cheap (relatively speaking... in 1990 I remember paying $40 per MEGABYTE for SIPPs or SIMMs) that why not go for 16 GB and give myself some breathing room.

I hadn't messed with the CPU PLL voltage: thanks for the tip! I'll try bumping it a bit and dropping the QPI/Vtt a notch and let it run overnight.

Just curious IMC (I'm assuming Integrated Memory Controller that the Core i7 has?) is the same as QPI/Vtt? So the Core i7 runs its own memory clock that's either 32x or 36x the bclk? How does that relate to the actual memory clock which I've seen called many different things; the memory I have shows stock speed in CPU-Z of 666 MHz, the Gigabyte motherboard calls it 1333 MHz memory clock, and the package said PC3 10666. Quite confusing array of numbers that seem to all mean the same thing. (See the attached CPU-Z screens...)

Thanks again!!!



Edited by skfurr - 10/12/10 at 2:18pm
    
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post #428 of 560
If CPU-Z says you're running 666, then you're actually running the RAM at double that rate at 1333MHz (this is dual channel ram). Make sense?

As for the 10666 that is where I have no clue and I'll let someone more informed than myself explain the memory #'s (there is a lot of info out there on the web about that stuff as well).

I run 8GB of 16000 ram (which runs at 1000 in CPU-Z and at 2000MHz (2GHz) actual.

Running multiple virtual machines will definitely use up a bit of memory!

Ransom
    
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post #429 of 560
The best I can do at this voltage. The minute I up the BCLK to 163, I get a BSOD 101.

post #430 of 560
Just a little update: I got to 4GHZ (160x25) stable @ about 1.37V. I just don't know enough about the Intels, and I think my MSI H55-GD65 mobo doesn't have a setting for Vdroop control...sadly...cause, I watch it go 100% Load in CPU-Z down to 1.312V. I think that's what's keepin me from higher OCing.

Soon as I get done with a bigadv for F@H, I'm gonna try and OC it higher and run peak temps around 72-73C and constants around 70C.
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