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Unwarranted i5-760 Oc Preformance/Heat Issues.

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December 3, 2010 3:59:04 PM

Ever since I got this i5, I've read great things about it easily overclocking to 4gz, sometimes only by messing with the minimal amount of settings needed to in BIOS. The problem I have with my overlcock, is that while I can overclock to ~3.6ghz using auto-voltage to set VCore to ~ 1.3 (overvolted I know), when manually setting the voltages (to ~1.3), the BLCK won't go higher than 185 (~3.89ghz) without heat issues arising. This wouldn't be that big of a deal either, but neither of those settings are high enough to warrant those issues when taken into consideration with the fact that my hardware should be able to easily take care of the overclock in my opinion.

Specs:

Board:
Asus P7P55d-E Pro

CPU:
i5-760

CPU Cooler:
Thermaltake Frio (w/ 2 fans mounted, one for intake one for out)

Case:
Antec Nine Hundred Two (one topside 200mm fan, one backside 120mm , and two 120mm frontside intake fans)
= 6 total fans

RAM:
8gb G. Skill Eco RAM set to normal specs but using 1.4V for BSOD prevention.


Using coretemp and prime95(full load temps):
With BLCK at 160 and VCore at ~1.2 temps are maxed at around 63C
With BLCK at 170 and VCore at ~1.25 temps are maxed at around 67C
With BLCK at 185 and VCore at ~1.3 temps are maxed at around a whopping 75C, and at that point prime95 will stop working.


Note: All voltages are manually set as low as possible before errors eventually occured unless otherwise noted.
a c 103 à CPUs
a c 190 K Overclocking
December 3, 2010 4:09:35 PM

Thermal paste correctly applied using right amount?
Moto
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December 4, 2010 5:43:49 AM

those temps seem to be very similar to mine also, I also own an i5 760 with a CM Hyper 212+ cooler instead though.

well let me double check, ill post my results here in a sec

*edit*

ok so I did the same test as you, well in Prime95 I did the Large FFT test to get my max temp. I ran the test only for 5 minutes a piece on each configuration until I got to test 6. If I would have run it longer im sure I would get higher temps.

BLCK at 160 and VCore at ~1.2= 58C
BLCK at 170 and VCore at ~1.25 = 63C
BLCK at 185 and VCore at ~1.3 = 71C

I just think that is average temps for the i5 760 with air cooling. I remember watching a video of some guy that OC'd his i5 760 with blck @ 200 and 1.25V. He said he was getting 64C after 4 hours. He was running his system on one of those test platforms too (the two tier "cases" that allows people who test hardware out a lot to easily access their hardware) so he didnt have to worry about airflow at all.



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a b K Overclocking
December 4, 2010 2:51:13 PM

My system is under members config
But basicly i5-750/HSF is Zalman 9700/4 x 2 gigs ram, DDR3-1600 CL 7

Currently running with Blck set to 200, multiplier @ 16 for 3.2 Ghz. My vcore comes up at 1.09 V (I had set it to 1.2xx) Max temp w/prime 95 is approx 55 C.

I had tested it 3.6 and 3.8 when I only had 2 x 2 gig ram. Was stable @ 3.8 (200 x 19) and temps, if my memory served me right was mid to upper 60s. Will retest, but it is a pain as my current key board goes to a USB switch (share between this computer and my 2nd computer (e6400 also @ 3.2 GHz).

Didn't try higher than 3.8 ( diff between 3.8 and 4.0 is only about 5%). I'm fairly happy at 3.2
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a b à CPUs
a b K Overclocking
December 4, 2010 5:12:21 PM

OK
Results
200 x 18, vcore @1.20 temp went up to 67 C (but I forgot to raise HSF fan speed)
200 x 19, vcore @ 1.2375 max temp was 62 C after 1 hour

Note, my room is cool (winter and room temp set to 68 F) Test done, returning to my lowly 3.2
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December 4, 2010 6:58:41 PM

RetiredChief said:
My system is under members config
But basicly i5-750/HSF is Zalman 9700/4 x 2 gigs ram, DDR3-1600 CL 7

Currently running with Blck set to 200, multiplier @ 16 for 3.2 Ghz. My vcore comes up at 1.09 V (I had set it to 1.2xx) Max temp w/prime 95 is approx 55 C.

I had tested it 3.6 and 3.8 when I only had 2 x 2 gig ram. Was stable @ 3.8 (200 x 19) and temps, if my memory served me right was mid to upper 60s. Will retest, but it is a pain as my current key board goes to a USB switch (share between this computer and my 2nd computer (e6400 also @ 3.2 GHz).

Didn't try higher than 3.8 ( diff between 3.8 and 4.0 is only about 5%). I'm fairly happy at 3.2


how come your multiplier is so low? Will it only keep stable with a 16x multi?
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a b à CPUs
a b K Overclocking
December 4, 2010 10:34:17 PM

No it is stable upto 3.8 GHz (200 x 19). I stopped there and did not try the 20 x for a OC to 4.0 GHz. There was enough headroom temperature wise as I only hit 62 C @ 3.8. - Just did not see any sense in going another 200 MHz which is only a 5% increase and not really noticeable.

I keep it @ the 3.2 Gigs for normal every day usage (not a gamer), but it's nice to know I can simply up the multiplier to 19 and only have to increase vcore to 1.24 if, and when I need it. More a computer hobbist.

OP what Ram are you using ?? 1600 or 1333, reason I asked is that the 1600 seams to lend itself better to using a bclk of 200.
ie 1600/200 = 8 where as 1333/200= 6.665

Reason for 16 x is that I have my bclk @ 200, like even numbers, ie 16 x 200 = 3.2 and 16 x 8 = 1600 for My DDR3.
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December 6, 2010 6:39:48 PM

I have the same problem and we are using identical parts, i using asus p7p55d-e pro, same case, and ram. I am using stock cooling but my temps are about the same as yours.


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Anonymous
a b à CPUs
a b K Overclocking
January 16, 2011 2:13:48 AM

using the corsair h70 here and the asus p7p55d-e deluxe
my i5 760 is running stable at 4ghz(1.206V)
temp with linx about 64c (coretemp)
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