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

[eva2000]

hehe thanks

I think i can say the same for my L939B474 and EK Supreme HF H2O

I'll post some more results, when i resolve my waterpump problem. If i turn it off, i can't get it started again for a few hours (if). So i don't turn it off. Running CPU a higher can be a bit risky. Last time i was matching some of your SPI32M tests with ram on 2200MHz @1.65V and 220x20 core and i got too heavy on bclk button (love that MSI stuff). Got stuck with dead pump for 5 hours Need to screen some 3DMark tryouts, 4650 MHz with some help of open window

hehe.. hope you solve your problem so we can see some more results

Hey guys...which pch and vtt can/must I use for 200 bclk and 24/7 settings on air?
My aims are 4000MHz but 4200 would be nice...thanks for your help.
System:
i5-750
P55-UD6
Enermax Pro 425+
Powercolor 5770
G.Skill Ripjaws 1600 7-8-7-24 2T

depends on cpu as to how much i think

my latest results

System:

• Intel i5 750 L925B626
• Corsair H50-1 s1156 H20 + stock 59cfm Corsair fan (pump on cpu fan header, fan on cpu_pwm fan header)
• DFI LP DK P55-T3EH9 12/08 beta bios
• 128MB Gainward FX5200 PCI video card to start with
• 2x2GB A-DATA 2000X dual channel kit #4 (modules 7+8)
• 640GB Samsung SATA
• Pioneer DVD-R
• 1KW PC&C Quad SLI psu
• Additional cooling: 120x25mm Spire 75cfm fan over cpu socket/pwm area and 60x25mm Sunon 23.5cfm fan over PCH chipset heatsink

DDR3-2008Mhz 8-9-8-24 1T at 1.58v

Super Pi 32M, HyperPi 4x32M, Everest and added MaxPi multi









DDR3-2108Mhz 8-9-8-24 1T at 1.66v

Super Pi 32M, HyperPi 4x32M, Everest and added MaxPi/MaxMem multi










DDR3-2194Mhz 8-9-8-24 1T at 1.70v

Super Pi 32M, HyperPi 4x32M, Everest and added MaxPi/MaxMem multi

[powergiga08]

Hi,

So far I am done with OC setting and save profile, soild stable and play COD4 all day long no problem with my setting, but little too high for Vcore and temp, see pix below.

This Asrock board is not great and take too much Vcore than other boards, my i5 750 vid default is 1.224 in bios showing.





That is all folks.

pg

[ceevee]

so much to learn.

[xdan]

powergiga08 at 4ghz you would use much lower voltage, 1.344-1.3625. And the performance would be akmost the same.
Your chip is a midddy one, like mine . I have a vid of 1.243v and it can do 4ghz with 1.328v-lod(1.331v bios)-priming 2-3hours(in signature 1.312v it can do about 40 minutes). I don't think that it would go with less voltage on other boards.

[eva2000]

DDR3-2274Mhz 8-9-8-27 1T at 1.72v
Loosened timings alot more, pushed voltages a bit more and dropped QPI frequency from 4.8GT/s (18x multi) to 4.27GT/s (16x multi) to achieve my highest frequency so far for bclk 227bclk as well as for memory frequency @DDR3-2274Mhz 8-9-8-27 1T at 1.72v validation and @DDR3-2247Mhz 8-9-8-27 1T at 1.72v for Super Pi 1M.

[AcEmAsTr]

My i5 750 is currently at 3.6ghz without upping voltage (1.25), pushing more and more so will keep updated, temps are hitting 69c though

[powergiga08]

powergiga08 at 4ghz you would use much lower voltage, 1.344-1.3625. And the performance would be akmost the same.
Your chip is a midddy one, like mine . I have a vid of 1.243v and it can do 4ghz with 1.328v-lod(1.331v bios)-priming 2-3hours(in signature 1.312v it can do about 40 minutes). I don't think that it would go with less voltage on other boards.

i did use voltage range from 1.344-1.3625 with 4ghz no problem but try run any stress apps, it will reboot or hard crash so i increase the higher voltage till stable for running stress apps.

oh here is article that Asrock is only this board take high voltage and vtt too link at http://www.fudzilla.com/content/view/16328/40/ read on.

BTW, WEI processor score from 7.5 with 4ghz to 7.6 with 4.2ghz.

dg

[Hi_Clocks]

Just picked up a new I5 750 from ebay, FPO/Batch# L933B464. Looking forward to getting it in and clocking it up. I did some research and it looks like the L933XXX batches are some of the best thus far. 4Ghz should be easily obtainable on low volts, looking for 4.2Ghz 24/7 P95 stable

[Vanz]

Some testing with water cooling in a bit chilled environment (10-15° C). Cpu had ~25° under load according to motherboard debugger screen (not completly reliable).

SPI1M @4907 MHz (24x 204 MHz) Had a screen with ram at 7-8-7-21 @1.7V, but saved screen is white


3D mark 2005 in my 24/7 system, haven't tried higher yet. I had already closed the window, load temp ~28 according to debugger screen.
4692MHz (24x 195.5MHz)

[Hardc0r3]

powergiga08 at 4ghz you would use much lower voltage, 1.344-1.3625. And the performance would be akmost the same.
Your chip is a midddy one, like mine . I have a vid of 1.243v and it can do 4ghz with 1.328v-lod(1.331v bios)-priming 2-3hours(in signature 1.312v it can do about 40 minutes). I don't think that it would go with less voltage on other boards.

yeap that's correct, it's all on the cpu, mine is more voltage hungry, for 4ghz i need 1.368 in bios LLC on with 1.21vtt in order to be stable @ 200 x 20 with ram running @ 2000cl9 bad luck twice :L934BXXX and the other was a L938bXXX

[cole2109]

Max BCLK
http://valid.canardpc.com/show_oc.php?id=974760

[Jor3lBR]

Wow searched a lot here but could not find anybody with a i5 670. Can someone come forward and share some numbers. I would like to know what is considered a good OC with that chip and also an extreme OC with decent voltages. Thanks!

[xdan]

Max Bclk with the unit next by an open window...
http://valid.canardpc.com/show_oc.php?id=966385

[Jor3lBR]

There you go, just assembled the PC and started testing would really like to see some other i5 670 results:

Classified 200 + retail i5 670 L934xxx

[overclocking101]

I have a question. are these cpu's the same as core2's as in the newer ones now oc crappier due to higher VID?? that seriously blows because especially if its true with i5's a lot of people bought i5 750-s cuz they are cheap therefore late adapters like me get proked due to crappier voltage needed to oc. bummer if it is the same. also how do you tel VID?? core temp ss in this thrad do not show VID anymore

[Jor3lBR]

I have a question. are these cpu's the same as core2's as in the newer ones now oc crappier due to higher VID?? that seriously blows because especially if its true with i5's a lot of people bought i5 750-s cuz they are cheap therefore late adapters like me get proked due to crappier voltage needed to oc. bummer if it is the same. also how do you tel VID?? core temp ss in this thrad do not show VID anymore

Which cpu's your referring too?

i5 750 : 4 cores 4 threads : 45nm
i5 670 : 2 cores 4 threads : 35nm

Both are great ociers.

[SunTzu69]

My i5 is currently at 3.7Ghz @ 1.3vcore with load temps around 65c. I am using a Mega Shadow Deluxe 1200 rpm push/pull configuration for cooling. I'd like to run a 5-6 year setup 24/7 but only under load a few hours a day.

What is the safest vcore for me assuming temps under 75-80c? VTT is set at 1.24v and I don't intent to go higher because of the uncertainties there.

[overclocking101]

Which cpu's your referring too?

i5 750 : 4 cores 4 threads : 45nm
i5 670 : 2 cores 4 threads : 35nm

Both are great ociers.

mainly talking about the quads but have been putting a lot of thought into the i5-6XX's due to their verclockability and their higher mulipliers

[SunTzu69]

I'm at 3.75 vcore and 1.35 VTT which I need for 4000MHz with my less than stellar i5 750 sample. Temps. are in the mid 70C's under load with P95 which is not excessive with these cpu's. You may have a better cpu based on your voltages for 3700MHz, if you prefer to stay at the voltages you have set now, there is nothing to worry about.

Looking at your memory specs., are you sure that's DDR2

Whoops, not quite done updating that sig. Looks like I forgot a "3". Thanks for the input. At 3.75 vcore do you have a fairly good comfort level that the cpu could run a good 5-7 years 24/7? If I can get some comfort from the community I will certainly push it up to 4Ghz. My bclock and RAM have already been tested to run up to that level, so she should make it.

[Dee]

mainly talking about the quads but have been putting a lot of thought into the i5-6XX's due to their verclockability and their higher mulipliers

I would go for the quad. It's made a big difference for me. Previously I was using an 4.3Ghz E8600 but the 750 feels quite a lot smoother, opens applications faster, and nothing at all seems to slow it down. I have only a moderate OC right now (using dynamic OCing -- I love it!) and no matter how many programs I open this 750 just takes it in it's stride. Superb CPU and very well priced.

[Blackoberst]

My i5 750 L939B455 on the DFI DK P55. The board now is now dead due to unknown reasons.

[-=[kz-0]=-]

Cpu voltage 1.475 without vdroop, VTT 1.324, PLL 1.918, PCH 1.120, V dram 1.671v but i have some poor memory..and don't forget tu use lower QPI link value(you have two values, for example at BCLK 200 you have 6.400GT and 7.200GT). And don't boot from bios at 228 BCLK directly, use 220 and raise it with OC TUNER.

wow thanks..so i use the OC Tuner from 220 and beyond..

[SunTzu69]

I already figured that! I need to check what I post too, take a look at my original post, I quoted my vcore at 3.750v. Let the record say I meant 1.3750
I have no problem with my current voltages other than the fact that my cpu is a bit of a dog for it's higher voltage requirements, compared to some of the examples posted here. It looks like your cpu should require less volts than mine to do 4000MHz comfortably. I would think that mine would run fine at 1.3750 vcore for many years, but then I have never kept a cpu for more than a couple of years
I think you will have a safe and secure journey to 4000MHz.

Thanks. Based on information from Miahallen and Gautam who has helped me with a few of my builds, I am pushing my i5 to 4Ghz and beyond. I will post results as soon as I can run a few stability tests to see if I can run 4Ghz stable under 1.38v, and it looks promising.

What do you guys make of this post by Sadbuttrue from the Hexus.net site:

"From the testing I've done, which contradicts almost every overclock you'll find on the web, the i5 750 needs high voltage on the vtt to be 100% stable. You can run it at 4ghz @ 1.35v vcore/1.2v vtt and have it pass all the usual stress testers (lynx 2 hours, prime95 blend 8 hours, prime95 small fft 8 hours, memtest86 10 hours), but it isn't "100% stable". The problems arise when you start loading the memory beyond 3gb during normal operation.

For example, with 2.8gb of memory in use (development machine) one may decide to have a quick game, pushing memory load close to 4gb. This produces the same result with a low vtt every time. Programs (starting with the game itself) will crash and windows will lock up. I've repeated these tests dozens of times. At 4ghz anything below 1.3v vtt crashes in this condition, with it happening once at 1.32v. For "100% stability" I settled on 1.36 vtt and 1.35v vcore, other components listed on left."

I am curious to hear some views on his VTT testing/results. Do you really need higher than intel ratings on VTT voltage to be truly stable?

[eva2000]

Thanks. Based on information from Miahallen and Gautam who has helped me with a few of my builds, I am pushing my i5 to 4Ghz and beyond. I will post results as soon as I can run a few stability tests to see if I can run 4Ghz stable under 1.38v, and it looks promising.

What do you guys make of this post by Sadbuttrue from the Hexus.net site:

"From the testing I've done, which contradicts almost every overclock you'll find on the web, the i5 750 needs high voltage on the vtt to be 100% stable. You can run it at 4ghz @ 1.35v vcore/1.2v vtt and have it pass all the usual stress testers (lynx 2 hours, prime95 blend 8 hours, prime95 small fft 8 hours, memtest86 10 hours), but it isn't "100% stable". The problems arise when you start loading the memory beyond 3gb during normal operation.

For example, with 2.8gb of memory in use (development machine) one may decide to have a quick game, pushing memory load close to 4gb. This produces the same result with a low vtt every time. Programs (starting with the game itself) will crash and windows will lock up. I've repeated these tests dozens of times. At 4ghz anything below 1.3v vtt crashes in this condition, with it happening once at 1.32v. For "100% stability" I settled on 1.36 vtt and 1.35v vcore, other components listed on left."

I am curious to hear some views on his VTT testing/results. Do you really need higher than intel ratings on VTT voltage to be truly stable?

Well linx should be properly stress tested with all memory which would load up >3GB in most cases otherwise you're properly stressing the entire system, but there's always some truth that stability tests are only really stable for the stress test app your running.

Then again what would you rather have (for oc'd rig)

situation #1
- play a game which only needs cpu vtt 1.3+ for 2-4hrs of the game, and reduce cpu vtt 1.2v for the other 20-22hrs of 24/7 everyday app stable

or

situation #2
- run 24/7 at cpu vtt 1.3 ?

It comes down to trial and error testing and figuring out what your system is capable of. If that author's system requires such high volts then that's his experience. Yours may differ

Remember you need higher cpu vtt also for high bclk and/or mem and uncore frequency clocks. And this will differ depending on cpu memory controller as well as memory module pairing (different modules could have a different stress load on mem controller too).

[loybond]

For those of you using an EVGA P55 FTW, have you upgraded to the latest E657 BIOS and found that you're missing features? I can no longer seem to locate the turbo toggle in the CPU options screen. Also, how do you get the 750 to run with a 21x multi? Can't change it in the overclocking screen.