** OFFICIAL ** Core i5 Overclocking Results/Tips Thread

[ninjagordy]

Cheers Dude!... im benching now at 4ghz, however.....my ram is running single channel...im running g-skill ripjaw ddr3 1600mhz ram....any ideas why???

cheers

gordy!

[theob42]

hey guys, not sure where to post but if anybody can help that would be great.

i have a gigabyte p55-ud2 motherboard, and have corsair 4gb ddr3 1600mhz ram. but i dont think its supported by this motherboard. i cant return the ram now, the ram is showing up as 1066mhz now, is there a way to make it work at 1600?
the official site says it doesnt support it but other sites say it does...

[mikecdm]

hey guys, not sure where to post but if anybody can help that would be great.

i have a gigabyte p55-ud2 motherboard, and have corsair 4gb ddr3 1600mhz ram. but i dont think its supported by this motherboard. i cant return the ram now, the ram is showing up as 1066mhz now, is there a way to make it work at 1600?

Overclock it. On my mb there isn't enough memory dividers to make it run at rated speed. The only way of doing so is buy raising the bclk, which in turn will increase the memory speed. Not sure about your mb, but I'd assume that it's similar.

[theob42]

yes but not sure how to do that...

[Vinas]

Cheers Dude!... im benching now at 4ghz, however.....my ram is running single channel...im running g-skill ripjaw ddr3 1600mhz ram....any ideas why???

cheers

gordy!

Stupid question but do you have them both in the red slots? The ram slots alternate red and black, each color is a channel pair. Anyway, mine run dual channel just fine in the red slots.

Overclock it. On my mb there isn't enough memory dividers to make it run at rated speed. The only way of doing so is buy raising the bclk, which in turn will increase the memory speed. Not sure about your mb, but I'd assume that it's similar.

Mike is right, you're not seeing the 1600 speed because you need to OC to reach those speeds. Look under your RAM settings there will be different speeds listed. In the past you had to press ctrl+f1 to get into the tweaking options on giga boards.

[KURTZ]

guys, just a question: what is the SAFE voltages for:
vCC, vTT, vPLL and IMC? thanks

[Capper5016]

I've been really happy with the MSI P55 GD65, with a couple of major caveats......

1. I have a BFG 850W PSU powering the system, and until doing some research could not figure out why the OCGenie refused to work at all. The system would boot, power down a few times, then refuse to boot. Evidently, my PSU is one of the handful that refuse to work at all with the GD65.

2. The GD65 suffers from horrendous VDroop. If you set the BIOS to 1.4V with Loadline Calibration "Disabled" (I say "Disabled because the BIOS is screwed up and "Disabled is actually "Enabled") the voltage drops to 1.31-1.32 before a BSOD. With the Loadline Calibration "Enabled" (or "Disabled" in the BIOS and the VCore set to 1.33V, the voltage climbs to 1.42-1.456V. I've tried everything from 1.33 to 1.4V and the VCore still spike tremendously. In my opinion, this is an unsafe fluctuation.

Anyone else seeing similar results?

[Sam_oslo]

All of you p55 OCing nerds should .. Check your sockets!

" ... The overriding concern is that we have damaged every motherboard in our possession for the overclocking P55 shootout as well as two very expensive i7/870 processors. " Check your sockets!

[GrossmeisterB]

All of you p55 OCing nerds should .. Check your sockets!

" ... The overriding concern is that we have damaged every motherboard in our possession for the overclocking P55 shootout as well as two very expensive i7/870 processors. " Check your sockets!

I read a little bit about that problem elsewhere, too...but it seems it only happens in REAL overclocking situations, with sub-zero-cooling and extreme voltages...I don't think someone with an aircooled CPU running at 4GHz with under 1,4V should get into trouble...

[Sam_oslo]

I read a little bit about that problem elsewhere, too...but it seems it only happens in REAL overclocking situations, with sub-zero-cooling and extreme voltages...I don't think someone with an aircooled CPU running at 4GHz with under 1,4V should get into trouble...

Yes, the immediate danger seams to be threating the nerds and extreme OCing on subzero, but there is a bit more into this history. The long term effect of a high 24/7 OC seams to be under question too, as AnandTech put in this way:

"We have not had any problems with air or water cooling overclocking up to 4.3GHz, although we do have a i5/750 that has developed a few dark pads after a thousand hours or so of constant overclocking. " - Link

It is a good idea to keep an eye on how this article will be developing over time, anyways.

[keenan]

hey guys, not sure where to post but if anybody can help that would be great.

i have a gigabyte p55-ud2 motherboard, and have corsair 4gb ddr3 1600mhz ram. but i dont think its supported by this motherboard. i cant return the ram now, the ram is showing up as 1066mhz now, is there a way to make it work at 1600?
the official site says it doesnt support it but other sites say it does...

Drop your cpu multi down to 15x
Raise your bclk to 200
Put your memory mulri to 8x

That should give you 3Ghz on the cpu and 1600Mhz memory

Check your voltages and DONT put them on "auto"

[PolRoger]

guys, just a question: what is the SAFE voltages for:
vCC, vTT, vPLL and IMC? thanks

Good question. I'm now running more vcore then I care for @ 4.2 but I'm still just exploring with this combo. I'll most likely settle for 4.0 with the lowest voltages I can manage.

[Vinas]

All of you p55 OCing nerds should .. Check your sockets!

" ... The overriding concern is that we have damaged every motherboard in our possession for the overclocking P55 shootout as well as two very expensive i7/870 processors. " Check your sockets!

Right. This is so far caused by overpressure by LN2 pots and such. Not really worried at all.

[ninjagordy]

hey guys,

right, i re-installed my ram, and cooler today, got my temps to a comfortable level now but the single channel scenario still persists.

is there any way iv switched something of on the board??

maxiumus III gene, 2 x 2gb ripjaw 1600mhz ddr3 and an i5.... (thats my rig)

cant understand it...tried every socket and still single channel!!!

all help appreciated...

[NoepZor]

I've putted my system together and played a little with it.

First of all I tried the OC Genie button on my GD65, it will set the CPU at around 3300Mhz with an 200Mhz baseclock.

Then I googled a Core i5 overclocking guide and used the values mentioned there (1.4v vcore 1.4v VTT 1.65v DDR and 1.9v PCH)

I turned down the mem ratio and the QPI ratio.

After setting the CPU to 3,7Ghz I went into Windows. After some Superpi runs I started playing with the baseclock buttons. Here is my final Superpi result at settings above.



How much Vcore and VTT is safe to use 24/7?

[ninjagordy]

hey dude... i personaly wouldnt go much higher than what your at now, im sure one of the pro's will give u an exact figure. hows the load temps at that speed??

cheers dude

Gordy

[NoepZor]

I am suffering a massive vdroop on my P55-GD65. When I set the vcore to 1.46v in Bios, it's idle around 1.44v and when I stress the CPU with Prime95 it will drop all the way down to 1.34v according CPU-Z. Is such a drop normal and are there any solutions? I can't get my PC prime stable @ 4Ghz this way. Currently it max lays around 3750Mhz.

[Capper5016]

I've been really happy with the MSI P55 GD65, with a couple of major caveats......

1. I have a BFG 850W PSU powering the system, and until doing some research could not figure out why the OCGenie refused to work at all. The system would boot, power down a few times, then refuse to boot. Evidently, my PSU is one of the handful that refuse to work at all with the GD65.

2. The GD65 suffers from horrendous VDroop. If you set the BIOS to 1.4V with Loadline Calibration "Disabled" (I say "Disabled because the BIOS is screwed up and "Disabled is actually "Enabled") the voltage drops to 1.31-1.32 before a BSOD. With the Loadline Calibration "Enabled" (or "Disabled" in the BIOS and the VCore set to 1.33V, the voltage climbs to 1.42-1.456V. I've tried everything from 1.33 to 1.4V and the VCore still spike tremendously. In my opinion, this is an unsafe fluctuation.

I posted this the other day...... switch the Loadline Calibration to "Disabled", and drop your VCore to 1.34-1.35 and see if that helps.
I like the board, but it does a really poor job of managing the voltage fluctuations.

[Yamcha67]

I'm actually having some issues too, I don't know if its because of my motherboard or processor.. apparently my i5 750 isn't prime stable unless I set my Vcore + Vtt to Auto.. I've managed to get 4ghz.. ran prime 95 small fft's for 10hrs without error.. I messed around with manual voltages and one core fails after around 5hrs..

[Capper5016]

I'm actually having some issues too, I don't know if its because of my motherboard or processor.. apparently my i5 750 isn't prime stable unless I set my Vcore + Vtt to Auto.. I've managed to get 4ghz.. ran prime 95 small fft's for 10hrs without error.. I messed around with manual voltages and one core fails after around 5hrs..

Download Everest and Real Temp and use them to get an idea of where your voltages and temperatures are. I am pretty sure you are ok with the voltages set to "Auto", but lets figure out whats going on.

[Yamcha67]

Well the temps are under 70C (small fft load) , and CPUZ + Everest say the voltages are 1.43V.. but for me cpuz and everest don't seem to detect the voltages correctly, because when I had my core volt at 1.35V in bios it would read it at 1.4ish.. and when I had my volts at 1.4 cpuz/everest would read it at 1.5.. I also have load line calibration disabled.. should I have it enabled?

[chuck4456]

All of you p55 OCing nerds should .. Check your sockets!

" ... The overriding concern is that we have damaged every motherboard in our possession for the overclocking P55 shootout as well as two very expensive i7/870 processors. " Check your sockets!

Do you mean to tell me that none of you geniuses considered just taking out some of the bend in the lockdown arm to give the plate just a tad more tension?
I would have tried that after the first mishap. Then I would have at least known if that was/wasn't the problem.
Looks like most of them were loose or misinstalled and their could have been some arcing here and there.

[k0rben]

Hi guys!
So this is a "tip" thread also, so i have a question.
Its 8-pin (cpu power) necessary for a i5-750 cpu?

The situation :
cpu : i5-750
mobo: asus p7p55d
psu: arctic cooling fusion 550

This psu has 2x 12v rails, each 17A, and only has 4-pin for cpu power.
The motherboard has 8-pin, but 4-pins are covered by black plastic "thing".
Is it safe to have combination mentioned above and only 4-pin plugged to motherboard for powering cpu?
Also, i found this


Are there any limitations when i only have a 4-pin? How about OCing? What is the pwr consumption of i5-750?

Can someone try runing on 4-pin instead of 8-pin? (im not responsible for any damaged hardware, personal injuries etc. )

edit: oh i almost forgot! how about this 4to8-pin http://www.plinkusa.net/web4-to-8.htm ?

[Capper5016]

Well the temps are under 70C (small fft load) , and CPUZ + Everest say the voltages are 1.43V.. but for me cpuz and everest don't seem to detect the voltages correctly, because when I had my core volt at 1.35V in bios it would read it at 1.4ish.. and when I had my volts at 1.4 cpuz/everest would read it at 1.5.. I also have load line calibration disabled.. should I have it enabled?

If you have it set to "Disabled" then your voltages should not be dropping below what you have set in the BIOS, its should rise above what you have set. (Its a BIOS flaw, Loadline Calibration enabled should act like VDRoop and raise the voltage under load, instead of sagging).

Right now, until I find a way to measure those voltages accurately, or hear from MSI, my advice is to disable loadline calibration and run your system with the lower voltages. At 4GHz, I've found 1.33V VCore, 1,275 VTT to be the minimum stable, on air cooling it gives me temps in the mid 60s under load, and mid 30s at idle.

[jcool]

i5 750, GB P55M-UD4, 2x2GB Gskill Ripjaw 2000's, running 200x20 and 2Ghz dram stable with the following bios settings:

Vcore: 1,3V
LLC: enabled
VTT: 1,27V
Vdimm: controlled by XMP profile (=1,65V)
Timings: 9-9-9-27 1T as per XMP profile
QPI mult: 36x

Aftermarket Air cooler (Noctua C12P topdown), temps are in the high 60's crunching WCG.

Initially I thought I got a crappy chip but I guess it's decent enough? These Lynnfields all seem to need so much Vcore due to their on-die PCIe controllers :/