i5 750 @ 4ghz

[Saylick]

I see now. Maybe I can push my frequency to 6-7-6-18 if I increased my ram voltage?

I doubt it will go much lower. Typically, when you raise RAM frequencies, you must increase the timings as well, and I'm not sure how increasing the RAM voltage would help with the tightening of timings.

 

[Deders]

I see now. Maybe I can push my frequency to 6-7-6-18 if I increased my ram voltage?

Those are your memory latency settings, generally the looser (higher numbers) they are, the higher your memory will allow you to go.

@Saylick, what memory are you using? OCZ Platinums by any chance?

 

[netxzero64]

I see. Hahaha! I just wanna try my luck lol! if no post then it is a fail for me hahaha! This is the only time that I poured so much effort in OC'ing LOL!

 

[Saylick]

@Saylick, what memory are you using? OCZ Platinums by any chance?

Uhhh... They are a pair of Corsair XMS3 1600 2GB, rated at 9-9-9-24.

I think when I bought the RAM, the majority of DDR3 at 1600 was still running 1.65V and not the typical 1.5V by today's standards. They work fine at 1333 MHz, but I've had my computer crash whenever they get anywhere near 1600 MHz. I never really deduced if it was due to my uncore or if the RAM sucked. The RAM made it through a few Memtest86+ passes no problem, though.

How are the Platinums?

 

[Deders]

When I first got them they were rated for 7-7-7-20 @1600 &1.65v (they are very happy running at 1.5) but one of the sticks was faulty. It didn't show up in memtest but it did with window's memory diagnostic so I sent them back and the ones I have now are capable of the advertised ratings, and lower in some cases (actually running 7-7-7-16, and all the 20 odd other latency settings are much lower than standard ram). I wonder if they have similar chips in them.

 

[netxzero64]

I see. Thank you so much for your insights gentlemen. Currently, my mems are running on 1500mhz @ 7-8-7-18 and voltage on auto. I will try to run my system at 3.65ghz dynamic OC once I get my hands on a closed loop water cooling system by the 13th.

I am just glad also that this is the time that I choose to go up to DDR3 system since my last rig was still running on DDR2. I just bought my rig from a friend for $100 all in (motherboard, processor, psu, casing) and I bought my memory modules for a bargain. My kingston memory can run 1333mhz at 1.35v though.

 

[netxzero64]

I have made a milestone for myself. I was able to run my setup with a memory frequency of 1950mhz at 1.625v and 1.281v VTT (IMC in my case). Will try to burn more rubber later on. latency under 10-10-10-27.

The processor is still under stock cooler at 3.31ghz. lols!

 

[Saylick]

I have made a milestone for myself. I was able to run my setup with a memory frequency of 1950mhz at 1.625v and 1.281v VTT (IMC in my case). Will try to burn more rubber later on. latency under 10-10-10-27.

The processor is still under stock cooler at 3.31ghz. lols!

:thumbsup:

For your safety, I'd be careful with running a Vtt that high in my opinion... Wouldn't want you frying your chip and/or mobo...

EDIT: Ah, yes. Forgot that Intel updated the spec for the 750. The max Vtt they recommend you shouldn't go over is now 1.4V (p. 65) and not the old 1.21V. Either way, just a heads-up.

 

[netxzero64]

:thumbsup:

For your safety, I'd be careful with running a Vtt that high in my opinion... Wouldn't want you frying your chip and/or mobo...

EDIT: Ah, yes. Forgot that Intel updated the spec for the 750. The max Vtt they recommend you shouldn't go over is now 1.4V (p. 65) and not the old 1.21V. Either way, just a heads-up.

wow! I don't know such PDA exists! That is very helpful of you bro. Thank you so much!

I will try to test if it goes stable. I will format my rig first then go overclocking.

 

[netxzero64]

The question that I have right now is whenever I set the voltage for the cpu to be "offset", and everything on auto except the C states, my voltages go up to 1.35v. Is it better for the voltage to be set on manual instead of offset?

 

[Saylick]

Hm... It sounds like you're asking if it is better to have your voltages set on AUTO or on MANUAL. AUTO will most certainly be giving your chip more voltage than is needed for stable operation, whereas with MANUAL you can hone in on the lowest amount of voltage necessary for stable operation.

The offset voltage, if I recall correctly, is the additional voltage that will be provided on top of the base voltage (Vcc) when the chip turbo boosts. Again, leaving it on AUTO will probably lead to overestimation of the require voltage while with MANUAL, you can manually lock in an offset. The thing that sucks about MANUAL is that you have to do some trial runs to see what's the proper offset voltage for your chip.

 

[Deders]

It's actually 2 different ways of controlling voltage.

Normally you might juts set a voltage, but with offset it's the standard voltage +or- the amount you offset it by.

Like Saylick says Auto is generally not the best option as it tends to add much more voltage than you need, although it may be a good starting point if you know your system is stable on auto, you can then start reducing the voltages gradually and see if it is still stable.

 

[netxzero64]

Does your 3.8ghz OC downclock?

 

[Deders]

Mine does yes, down to 1625MHz

 

[netxzero64]

Mine does yes, down to 1625MHz

I see. Good for you. I don't know how to trim down the voltages and keep it stable. my 3.8ghz cannot boot below +0.5v on offset voltage.

 

[Deders]

Is your auto voltage different in cpuz at 3.8 than it would be at stock?

 

[netxzero64]

what do you mean? at stock 2.66ghz it is at 1.12v. at 3.8ghz it is at 1.33v. lower than 1.33v is unstable. I test stability under prime95.

 

[Deders]

That's great, I tested mine for over 24 hours with priome64 before I was happy it was completely stable. One time it lasted just over 23 hours before reporting a bad checksum so I notched the voltage up slightly and it has been there ever since.

You could also try using Linpack or Intel Burn in tester if you don't want to wait 24 hours.

 

[netxzero64]

I see.. Well im just sad about having the voltages at 1.33 and just get 3.8ghz. Unlike yours, at 1.25.. Deym

 

[birthdaymonkey]

After a few years running at 20 x 200, 1.375v core, 1.3v uncore, my i5 750 machine is starting to lock up at idle. Not sure what exactly is the cause, but I just reverted to stock settings to see if my overclock is going bad.

 

[tweakboy]

Wel you can put 1.31v for vcore voltage to get the stability on your OC

Should give you a 4.2Ghz OC. gl

 

[tweakboy]

Good day to everyone.

I have an intel core i5 750 processer under asus p7p55d evo board

My questions is that what voltage should I set my processor to have a stable 4ghz OC?

currently my IMC voltage is set at 1.225v and memory at 1.625v @ 1950mhz which is a bit high as 1.6v should be at 2133mhz. Processor speed at 3.7ghz

Any suggestions would be appreciated.

No need to touch voltage. Its free OC up to 4.2Ghz ...........you want 4.3 and higher then you have to touch the voltage and crank her up. gl

 

[netxzero64]

Maybe its beginning to die? haha! my 4ghz run is really hot at prime95 so I stopped the stress test because it rose to 79c under my seidon 120m.

 

[birthdaymonkey]

Maybe its beginning to die? haha! my 4ghz run is really hot at prime95 so I stopped the stress test because it rose to 79c under my seidon 120m.

Still haven't figured it out. I reverted to stock and have still had a couple hard lock-ups. OS install is quite old, so I'm going to try a clean install next.

 

[schmuckley]

mucho TL : DR
1.34-1.43
and about same on vtt..ehh..keep around 1.3 max if it's warm
and hope you have good cooling.
Some only do 3.8 stable..last one I had would do around 4.3 stable on air/water..was crap on cold, though.
I'm running this one right now: http://valid.canardpc.com/mrr0ac