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I5-760 OC

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March 17, 2011 4:57:53 AM




So, how does this 3.5Ghz OC look? I ran it stable for 7 hours with prime95 blend test. Not really sure how to get my memory to run at 800Mhz though and timings are off. Tried changing timings manually to stock but failed prime95 after only 4 minutes on 3 cores so I just set it back to auto :/ .

My temps also seem to jump a lot during stress test although they do stay within 4 to 5 degrees within each other. I didn't take a screen shot when I was doing my stress test. these pics are at idle temps, but my highest temp after 7 hours of prime95 was 67 Celsius. Running a hyper 212+ for cpu cooler. Just put it on last night so hopefully I will see a small drop in temps after thermal grease cures.

system specs:
i5-760 cpu, Hyper 212+ cooler (single fan), Asus P7P55D-E LX MOBO,MSI Twin Frazr II 560ti, 8gb Ripjaws 1600hz, TX850 PSU, HAF 922 Case

More about : 760

March 17, 2011 6:13:31 AM

any thoughts for possible improvement?
March 17, 2011 2:03:00 PM

Quote:
Use the 22X multi


I will give it a try at that multi. I was told though that anything higher than 22x multi would enable turboboost. This true?
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March 17, 2011 2:22:26 PM

22x + Speed Step + C States would turn on turbo. It might be possible to get it stable like that too, I ran my i5 750 at 177 base clock for a long time with turbo boost enabled, but your 760 has an extra bin so that might be a tad high.

Your RAM latency seems really high though, at 1400mhz mine would be at CL7, and you're way up at CL9/10. Depends on your RAM but I would think at least CL8 is possible at 1.65V.

Otherwise I'd recommend just using 200 base clock so you can set you RAM to the rated 1600mhz and then use maybe 19x for 3.8ghz (or whatever you feel comfortable with).
March 17, 2011 10:52:39 PM

wolfram23 said:
22x + Speed Step + C States would turn on turbo. It might be possible to get it stable like that too, I ran my i5 750 at 177 base clock for a long time with turbo boost enabled, but your 760 has an extra bin so that might be a tad high.

Your RAM latency seems really high though, at 1400mhz mine would be at CL7, and you're way up at CL9/10. Depends on your RAM but I would think at least CL8 is possible at 1.65V.

Otherwise I'd recommend just using 200 base clock so you can set you RAM to the rated 1600mhz and then use maybe 19x for 3.8ghz (or whatever you feel comfortable with).


I turned of all the c states, turbo boost, and speed step. I would like to run at 200 base clock but I don't know what kind of voltage i would need to do that. my ram is set to 1.5 volts but the timing are way off. they are supposed to be 9-9-9-24-1t but when i tried to run it at the manufacturer specs it failed prime95 after only 4 minutes so i just let it set itself in auto. I tried 185 x 20 the first time wanted to start out small but i will give 200 x 19 a shot and see if it will run stable for 1 hour.
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March 17, 2011 11:42:18 PM

Increasing base clock but keeping your CPU voltage roughly the same won't really require much change in voltage except maybe a little more IMC.

If the RAM is rated 1600mhz CL9, are you sure it's at 1.5V and not 1.65V? That would make a big difference and most performance RAM is rated for 1.65V.

Back to the question of voltages, best thing to do is leave them as is and if it fails, only then start trying to increase them... makes sense, right?

I would have to recommend that you attempt to keep c states, c1e, and eist turned on because they save power and drop the idle temp. They don't really mess with performance until you're breaking 4ghz in my experience and from what I've read.
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March 17, 2011 11:49:26 PM

I built 3 machines with i5-750's and Xigmatek coolers. Two of them would run 3.9ghz but one had trouble above 3.8ghz. My peak temps were about 60 under load. These machines are on 24/7 so we downscaled them to 3.5ghz for everyday use.

I wouldn't worry about memory timings if your machine runs otherwise. If you want to play with them that is OK, but improving memory timings makes very little difference to the overall speed of the machine.
March 18, 2011 6:59:47 AM

well i messed around in the bios after looking around in the net. and have actually increased my OC to 3.8Ghz. I also got my ram to 1600Mhz speed with spec timings :) . Had to increase my base clock to 200 x 19 to achieve that. The ram is supposed to run at 1.5v according to the manufacturer I got it for that reason actually. I will post some new screens soon with the new settings and temps. so far I am an hour and a half into prime95 blend test and no errors as of yet going to let it stress test for a total of six hours to make sure that it is stable. max temp so far is 67c on core 1 which runs hotter than the rest which are only at about 62-64c. I am going to bed hopefully i am all good in the morning. I will fine tune if everything is good as is, i believe i might be able to lower some of my voltages a tad more.
March 18, 2011 11:19:59 AM


This is after 6 hours of prime95 and test was stopped.



Also got my memory to run at specs.

Now i just want to fine tune my voltage values and I think I'm set. :) 

Thanks for any help offered guys as well as for any help coming.
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March 18, 2011 1:44:54 PM

Nice job zoltar. Last night I was messing with mine and am so far going with 206x19 for 3.9ghz because just dropping from 20x dropped the temps around 9-10C from max (from ~88C tops to 79C) but the speed only lost 2GFlops (from 57 to 55). Got the RAM running at 1648mhz CL8 1.685V or so.

Psycho, nice man! 4.2ghz... what were the temps? My max is in my sig, 4.13ghz and temps were close to 90C on stress, but I did get it stable. I think the 760s are better overclockers than 750s, although I don't really know why since they're basically identical except for max bins.
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March 18, 2011 1:57:47 PM

Wow... that doesn't seem possible! Haha. I guess I'll have to upgrade to watercooling to push that kind of voltage.
March 18, 2011 4:33:34 PM

wolfram23 said:
Nice job zoltar. Last night I was messing with mine and am so far going with 206x19 for 3.9ghz because just dropping from 20x dropped the temps around 9-10C from max (from ~88C tops to 79C) but the speed only lost 2GFlops (from 57 to 55). Got the RAM running at 1648mhz CL8 1.685V or so.

Psycho, nice man! 4.2ghz... what were the temps? My max is in my sig, 4.13ghz and temps were close to 90C on stress, but I did get it stable. I think the 760s are better overclockers than 750s, although I don't really know why since they're basically identical except for max bins.


thanks man, I'm really seeing some gains in all my games.
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March 19, 2011 8:46:17 AM

Well, since everyone are showing off their overclocks.. :D  This is my max OC [not stable] http://valid.canardpc.com/show_oc.php?id=1719179 .
And this is my 24/7 oc : http://s1232.photobucket.com/albums/ff380/s_rusev1/?act... under load it doesnt go above 65c, altough my case lacks airflow and when i remove the side panel temps drop to 58c. Im using a Hyper 212 plus with push/pull Scythe Slipstream @1200rpm, room temp was 24c. ^^ Temps after 10 runs of IBT http://s1232.photobucket.com/albums/ff380/s_rusev1/?act...
Oh and ofc my core voltage isnt 3V o.O :D  For the max oc i used 1.35v and for my everyday use i use 1.18v. And yeah, im also surprised at these results having in mind the Elitegroup motherboard and especially the Apacer and Elixir ram sticks.
!