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i7 3820 - 4820 Overclock Club - Page 89

post #881 of 6491
Hey All

coming from a I7-950 by way off a Fx-8150 to my Sabretooth X79 and 3820. I am finding that the intel provided strap is the most convenient way to get oc stables. I tried the asus rog way and left my voltage and digi settings as per his you tube vid. had cpu at 1.400V have been scaling back now at 1.380 at 4750MHz.

ram is at 1666 per the overlock 125 at 38 and at 1.5V for 16GB of matched cosair vengeance with a kingston ssdnow 90gb sata 6GB on the intel channel.

I am playing with fan setups on the h100 to see which is the best way right now I have a 650D with the 200mm in the front drawing in and two gelid fans on the rad in the top drawing in and then a scythe 120 on the back exhausting. I am going to swap this for a 140 gelid as well. I still think with the a 200 and two 120 drawing air into the case, the 200mm drawing cool air and the two 120's drawing cool air from the top BUT across the rad so ideally it is warm air in the case, a single 120/140 drawing all that out is not enough. I may goto push pull gelids on the h100 rad exhausting as well as the rear 140 drawing in and try it.

The temps between asus sensor and real temps have me confused at full load all cores I gat as high as 77C for a brief moment in real temp but the asus is 59-61C - which one to believe.

guess I will have to change my SIG soon as I get this thing rock solid. I really do not game it is more for graphics and handbrake so I could probably just see how low I can get voltages and optimum cooling and be happy with this now.

395
Edited by rodercot - 5/27/12 at 8:25am
post #882 of 6491
Quote:
Originally Posted by zerokool_3211 View Post

i just came from a i7-930 air cooled, to this setup here and i would have to say that it is amazing.....here is what i have stable so far and was pretty easy to get....
Intel Core i7 3820
Rampage IV GENE x79
Mushkin Blackline DDR3 1600 16GB (4x4GB)
Corsair H100 WC Kit Sapphire HD6970 2GB GDDR5
XFX 5450 1GB GDDR3 (4th monitor, not in Eyefinity...lol)
60GB Vertex 2 SSD's x 2 (RAID 0)
500GB WD Blue x 2 (RAID 0)
3TB SeaGate GoFlex Desk (USB 3.0)
OCZ 650w Modular PSU
23 inch AOC LED Monitor x3 (Eyefinity)
ASUS 21 inch (above for misc. stuff)
Logitech G15 Keyboard
Razer Naga Mouse
M-Audio Studio Monitors
336

Cool. Thanks for the reply brother.

Nice OC.
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Red Obsidian
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post #883 of 6491
i did not think that was too bad....i see most ppl on here with 103-105 gflops.....also yes i keep HT on which will lower them a little bit.....plus my system only been up for 2 days....but if other ppl feel i should look into why they are so low then please let me know so i can.....
post #884 of 6491
Pretty happy with my results with my Gigabyte UD5 X79 board and this i7 3820. Got 14 hours prime95 blend without issues with bstrap of 1.25 and multiplier of 36 (4.5 Ghz) and vcore set to 1.35 in BIOS. Load temps at 64C. I can propbably get that 64C down to 62 adding push/pull and an intake. vcore in CPU-Z under load shows 1.344

Had some issues with vdroop on this board dropping my BIOS vcore too low under load to get a stable OC without BSOD. Most suggested adjusting a BIOS setting to accomodate for vdroop but read mixed opinions on this.

As I understand it that vdroop is there to accomodate for spikes and thus should not be disabled or adjusted. So I decided to find an OC that can be accomplished within these limits which meant raising my BIOS vcore to 1.35V. and I also had readd - "the voltage you set in the BIOS is the ABSOLUTE MAXIMUM your CPU will see on that high-load to low-load spike. It is NOT the running voltage of your CPU".

However, looks like according to Intel with my OC to 4.5Ghz I am pushing to the stated safe limits Intel has.
My processor shows max VID of 1.35 so I am setting it just at the limit and that VID is for stock only. And I understand Intel says you should be under that 1.35 limit, but not sure if that applies to BIOS vcore or the one we see in CPU-Z under load. Temps at load are 64C and Intels Max (Tcase) looks to be 66.8C for this cpu. So seems I am also pushing the heat a bit far as well.

I know OC means pushing limits, but I want to stay at the lower end of pushing those limits and avoid degrading my processor before the 3-4 year mark.

So looking for advice. I am looking for a reasonable overclock and not something that would degrade the processor life too quickly. I would probably upgrade the CPU in 3-4 years. Is my current OC to 4.5Ghz considered a reasonable OC and presumably be safe enough for CPU life of 3-4 years? Not sure but what does Intel consider cpu life for most processors under their rated settings? Or do I need to be well below the rated VID range for reasonable safer overclock?

I would assume heat is the biggest killer of cpu, so is this 63C viewed as okay since its still below Intel's rated MAX (TCase) for this proc?

I also get a great OC to 4.3 Ghz using stock vcore, stock bstrap 100 and temps are great at 56C load. So maybe that is a beeter OC for limiting CPU degradation out to 4+ years life. And with using bstrap of 100 I can have my cpu saving power at idle since power save can't be on at higher bstrap. I did read however, that using the higher multiplier over default for the i7 3820 means it only runs full 4.3 Ghz on one core only and rest at at 4.0Ghz, is that really true? My BIOS seemed to show all running at 4300 but I did set each core multiplier manually to 43 in turbo mode rather then leave on auto.
Edited by jfcarbel - 5/27/12 at 2:40pm
post #885 of 6491
@jfcarbel

I don't know what the new acceptable temps on the i3/5/7 quads are. On my old E8600 dual core I used to shoot for and achieve 30C a lot with just air cooling. According to Intel though, that chip is rated for 66.8C plus whatever buffer they may have given you. 63 is a little close for comfort.

I lap all my CPUs btw, seems to help quite a bit when taking the time to do it right.

Also, if you're getting a consistent 5C drop by only sacrificing 100MHz total CPU speed, that's very worth the trade off. You're not going to notice 100MHz on a chip OC'd to 4.3GHz
    
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post #886 of 6491
Quote:
Originally Posted by r0b126 View Post

@jfcarbel
I don't know what the new acceptable temps on the i3/5/7 quads are. On my old E8600 dual core I used to shoot for and achieve 30C a lot with just air cooling. According to Intel though, that chip is rated for 66.8C plus whatever buffer they may have given you. 63 is a little close for comfort.
I lap all my CPUs btw, seems to help quite a bit when taking the time to do it right.
Also, if you're getting a consistent 5C drop by only sacrificing 100MHz total CPU speed, that's very worth the trade off. You're not going to notice 100MHz on a chip OC'd to 4.3GHz

The TJ max on these is 100c and most tend to think that 80c is good as a max. I personally shoot for <70c. Although at 4.7 I get close to 80c, so I've decided to sick with 4.3 for my 24/7 due to the ridiculously low voltage, and temps that only go above 60c during a linpack!
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post #887 of 6491
Quote:
Originally Posted by SneakyBushNinja View Post

The TJ max on these is 100c and most tend to think that 80c is good as a max. I personally shoot for <70c. Although at 4.7 I get close to 80c, so I've decided to sick with 4.3 for my 24/7 due to the ridiculously low voltage, and temps that only go above 60c during a linpack!

Yes, 200 MHz in real world is not going to make that much of a difference.

But I think at 4.3 using a 100 clock you only see that on a single core not all 4/8 for the 3820. I forgot where I read that. Can someone confirm that and know a good source for that info?
Perhaps I should try a 105x41 = 4.3 and then its across all active cores.
post #888 of 6491
Quote:
Originally Posted by jfcarbel View Post

Yes, 200 MHz in real world is not going to make that much of a difference.
But I think at 4.3 using a 100 clock you only see that on a single core not all 4/8 for the 3820. I forgot where I read that. Can someone confirm that and know a good source for that info?
Perhaps I should try a 105x41 = 4.3 and then its across all active cores.

On my board I have 2 options, "All cores" which clocks all cores with the same multiplier, or "Individual Core" which will allow me to specify what the multiplier will be depending on the threading of the load. So you could set it to say, Single thread x47, 2 threads x46, 3 threads x45, and 4 threads x43, as an example. I've read the same information you're referring to, but based on the tests I've done, the "All Cores" option does in fact clock all cores to that multiplier (at least according to every monitoring program that monitors the frequency of each core individually I've tried).

*edit* I've tested this on a 100 and a 125 strap.
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post #889 of 6491
Quote:
Originally Posted by SneakyBushNinja View Post

...but based on the tests I've done, the "All Cores" option does in fact clock all cores to that multiplier (at least according to every monitoring program that monitors the frequency of each core individually I've tried).*edit* I've tested this on a 100 and a 125 strap.

My Gigabyte BIOS may differ from yours, I don't have the all cores option, but I can in turbo mode set each multiplier.

What tool do you use in windows to view the speed of each core? CPU-Z is only showing me core #0 speed.
post #890 of 6491
Quote:
Originally Posted by jfcarbel View Post

My Gigabyte BIOS may differ from yours, I don't have the all cores option, but I can in turbo mode set each multiplier.
What tool do you use in windows to view the speed of each core? CPU-Z is only showing me core #0 speed.

I don't have much experience with the Gigabyte UEFI, so I can't really say. CPUZ will only show one core, I personally use Open Hardware Monitor and AIDA64 for my monitoring, but many prefer HWINFO.
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