Voltages on i7 930 Bloomfield

[Juddog]

I have a i7 / 930 Bloomfield, D0, and noticed that I can hit 4 Ghz at stock voltage, totally stable with 20+ passes of LinX. To get from 4 to 4.2 Ghz (stable, which I consider to be 20+ passes of LinX, and overnight OCCT) took a big voltage increase, to 1.34 (1.325 errored out on the 9th LinX run).

Now that I'm stable at 4.2, I'm looking to push to 4.4 and wondering what's considered "safe" for the i7 / 930 / Bloomfield? CPU is water cooled and temps were hitting about 54C max after several hours of LinX, and were hitting about 51C during OCCT. So I believe I have some breathing room to continue overclocking, I'm just nervous about the voltages. The memory voltage is set at 1.65v currently, and I have memory / QPI at 1600 / 3200.

 

[finbarqs]

really? For me, I had to go to 1.367 to be stable @ 4Ghz! What's your voltage settings?

 

[Juddog]

really? For me, I had to go to 1.367 to be stable @ 4Ghz! What's your voltage settings?

I'll have to wait until I get home to post everything, but it took a lot of tweaking voltages to hit 4.2 versus 4. 4 seemed to be effortless, which is why I was surprised it took so much voltage to hit 4.2 (stable being the key word - which is why I used the LinX 20 passes as the standard, since it seemed to be the only app which stressed out all 6 GB of RAM).

From what I recall the voltage setting at 4.0 was 1.24v for the CPU and I had the RAM at 1.65 the whole time.

 

[aigomorla]

to the average user 1.375 should be the start of the yellow line.

this is where u will start having to fight with temps.

To the power user, id say 1.45 on a D0 is the about the tip of the yellow line.
To cool a 1.45vcore D0, it will take some knowledge in cooling.

If your on water, id say max is 1.45, but you'll have longivity on your side.
I have friends who load up there i7's @ 1.45vcore under load under water since 920 launch, and there still kicking fine.

1.5 your asking for electron migration regardless of heat.
i wouldnt recommend 1.5 unless you can keep idle below 0C.

So @ 4.2ghz @ 1.275vcore your cpu will probably put out about 180-190W @ load.
180/1.275v = 144 AMPS!!

This is why i tell people make sure your board has a very beefy vreg system.
Ie... at least an 8 phase motherboard.

 

[Juddog]

to the average user 1.375 should be the start of the yellow line.

this is where u will start having to fight with temps.

To the power user, id say 1.45 on a D0 is the about the tip of the yellow line.
To cool a 1.45vcore D0, it will take some knowledge in cooling.

If your on water, id say max is 1.45, but you'll have longivity on your side.
I have friends who load up there i7's @ 1.45vcore under load under water since 920 launch, and there still kicking fine.

1.5 your asking for electron migration regardless of heat.
i wouldnt recommend 1.5 unless you can keep idle below 0C.

So @ 4.2ghz @ 1.275vcore your cpu will probably put out about 180-190W @ load.
180/1.275v = 144 AMPS!!

This is why i tell people make sure your board has a very beefy vreg system.
Ie... at least an 8 phase motherboard.

Cool thanks for the info! It's good to know I still have some breathing room. The LinX 20-run has been brutal, I didn't think that there would be a benchmark that's even harder on the system than OCCT but it definitely pushes everything to the limit.

 

[finbarqs]

well I'm on EVGA X58 SLI-LE motherboard, and I've FINALLY decided to OC the way the guide at the OC section told me to! (Find max BClock, etc.) Since I have a i7-930, I decided to change only VCC and VDIMM, since my max Multi is 21. And without messing with the multi (According to the guide, i should be fine) I shouldn't have to mess with the VCore Voltage (Just left it at Auto). So i'm doing the Intel Burn test @ Max Stress settings (standard and normal has passed with flying colors) and then I'm increasing the VTT.

One thing though, since I have a EVGA X58 SLI LE board, The VTT Voltage just says "+.25mV" rather than give me the full 1.45V or whatever... is there a way where I can see what my current VTT voltage is at?

Oh Yeah, I'm starting @ 166 BClock. VDIMM @ 1.65V 8x multi on G.Skill 1333 3x4GB RipJaw RAM.. So Far, Max Temps reached 71C on a core... with the lowest max temp core being @ 68C

 

[jvroig]

So @ 4.2ghz @ 1.275vcore your cpu will probably put out about 180-190W @ load. 180/1.275v = 144 AMPS!!

Amps of what? Are you talking about power? If you are referring to 190W of power, from the PSU that i7 will be pulling only about 15 - 16 amps (12V rail), so you can't be talking about power, especially because no PSU I know can supply 144 amps for a single component (and a CPU for that matter, not even the video card yet)

If you are talking about heat, then you are mixing it up with amps incorrectly. An ampere is a unit of electrical current, while a watt can denote many things, one of which is the rate of heat transfer, and another being VxA.

If you are talking of power, a watt is related to amps.

If you are talking of heat output, watts have no relation to amps.

I have no idea what your 144 amps mean. I can conclude that it can only be related to power draw because there are no amps in heat output, but then again, a power draw of 144 amps is just mistaken, so I do not know how to interpret your statement.

 

[finbarqs]

WOW... I just realized you have an AWESOME chip... Could've been binned for a Xeon! anyways, I tried the stock voltage @ 3.4 no problem. (166 blck @ 21 multi)

Then i tried 180 blcock @ 21 multi, and it took me the whole day to get it stable with intel burn test @ max stress. I had to + 100mV on the VTT and then increase the voltage to 1.275 as well as the memory to 1.65 and the QPI to 1.2V

Now 186 x21 I'm still crashing @ 1.3125V +150mV 1.3 on the QPI, still 1.65V on the memory... Keep in mind this is with Intel Burn Test Maximum stress levels. Standard I can pass easily. I probably can even pass Very high.

 

[aigomorla]

Amps of what? Are you talking about power? If you are referring to 190W of power, from the PSU that i7 will be pulling only about 15 - 16 amps (12V rail), so you can't be talking about power, especially because no PSU I know can supply 144 amps for a single component (and a CPU for that matter, not even the video card yet)

no im talking about current to the cpu socket.

your pushing over 100amps at that cpu though those sockets.

True its only 1.25v, but @ 100amps + thats a heavy load.

 

[Juddog]

These are my current settings at 4.2 Ghz:
CPU: 4.2
DRAM: 1600
QPI: bios shows 7200Mhz, but that can't be right can it?
Base Clock: 200
CPU ratio: 21
Memory ratio: 4
Uncore ratio: 8 (uncore 3200 Mhz)
Vdroop: "Low"
CPU: 1.343
CPU Pll: 1.88
QPI: 1.35
DRAM v: 1.65
IOH: 1.2v
IOH PCIE: auto
ICH: auto
Spread Spectrum: disabled
EIST: disabled
C-state: disabled
C1E: disabled
Overspeed protection: disabled
Hyper threading: enabled
Execute bit support: enabled