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Number crunching :
CPU Overclocking - is it possible?
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petri33 Send message Joined: 6 Jun 02 Posts: 1668 Credit: 623,086,772 RAC: 156 |
I can't get Boinc to a reliable state with ANY kind of OC going on, even the slightest bit. Is there something specific I need to tweak for Boinc or is it just a bad idea to OC for it? I have an otherwise fairly stable overclock, passed multiple stress tests for 6-8 hours each and the temps are also pretty comfortable. Running Boinc though, will result to random BSODs, from 5 minutes in to 3 hours in, I can't really replicate it. Anyone has had any better luck with overclocking and crunching? I have a feeling that the lunatics CPU optimizations were adopted to be the official CPU versions a couple of years ago. And it is also possible that the same thing happened to the Cuda x41zc. I'm not sure. I do not stress my CPU any more. It is an old 3930K and runs nowadays @3.9GHz. It used to run 4.3 24/7/365. 6 cores Seti and the remaining 6 ht cores serving GPU and me. I still have it running 6 CPU AP/MB and 6 free for other tasks. It seems to be doing quite OK. To overcome Heisenbergs: "You can't always get what you want / but if you try sometimes you just might find / you get what you need." -- Rolling Stones |
William Send message Joined: 14 Feb 13 Posts: 2037 Credit: 17,689,662 RAC: 0 |
I have a feeling that the lunatics CPU optimizations were adopted to be the official CPU versions a couple of years ago. And it is also possible that the same thing happened to the Cuda x41zc. I'm not sure. Nope, the CPU versions are not from us, and neither are the android ones. We have,however, been supplying the GPU versions for several years now. That includes x41zc. _some_ optimisations made it into the stock CPU code over the years, but stock only supports SSE and AVX SIMD levels and that makes a hell lot of difference if you have something that supports say SSE2. A person who won't read has no advantage over one who can't read. (Mark Twain) |
petri33 Send message Joined: 6 Jun 02 Posts: 1668 Credit: 623,086,772 RAC: 156 |
I have a feeling that the lunatics CPU optimizations were adopted to be the official CPU versions a couple of years ago. And it is also possible that the same thing happened to the Cuda x41zc. I'm not sure. Thanks for clarification. To overcome Heisenbergs: "You can't always get what you want / but if you try sometimes you just might find / you get what you need." -- Rolling Stones |
Claggy Send message Joined: 5 Jul 99 Posts: 4654 Credit: 47,537,079 RAC: 4 |
I have a feeling that the lunatics CPU optimizations were adopted to be the official CPU versions a couple of years ago. And it is also possible that the same thing happened to the Cuda x41zc. I'm not sure. The Function choices that are available to the Stock 7.01 Linux x64 app, there are some SSE2 and SSE3 optimisations, But only for ChirpData: setiathome_v7 7.00 Revision: 1772 g++ (GCC) 4.4.6 20110731 (Red Hat 4.4.6-3) Claggy |
Dr Grey Send message Joined: 27 May 99 Posts: 154 Credit: 104,147,344 RAC: 21 |
Just to check in with my 5820K experience with Boinc. While it seems to have been stable for a while at 4.3 GHz, over the last few days I've had a series of reboots - about once a day. So, I've dropped it down to 4.2 GHz and it's been steady for the last 48 Hrs. I'm thinking I could add a bit more voltage or turn the fans up a bit to keep it cooler for stability at the higher speed but I don't need the extra heat or noise in the room. I'm looking at the temperature now and its sitting at 67 C being cooled by an H100i. Maybe as the temperature drops outside over the next months I'll push the voltage up a bit instead of turning on the heating and run it a little hotter. |
kittyman Send message Joined: 9 Jul 00 Posts: 51468 Credit: 1,018,363,574 RAC: 1,004 |
Thank you very much, Michael for that kind comment...... The frozen experiment ended a while back. Very hard to maintain, and almost certainly resulting in mobo or cpu demise...LOL. I lost a couple of both to the freezer. Condensation control is near impossible at those temperatures. Tube after tube of silicon grease in the cpu socket and all around it..... But I was able to do it for long enough to show that at least it COULD be done. All air cooled now, and the GPUs have taken over, so CPU ocing does not have near as much impact anyway. The compressor setup is now in my basement. Maybe if one day there is some kind of Seti museum, it should go on display there.... It was a very interesting bit of Seti and computing history, however. "Freedom is just Chaos, with better lighting." Alan Dean Foster |
J. Mileski Send message Joined: 9 Jun 02 Posts: 632 Credit: 172,116,532 RAC: 572 |
Modern phase change cooling |
kittyman Send message Joined: 9 Jul 00 Posts: 51468 Credit: 1,018,363,574 RAC: 1,004 |
Modern, hell....LOL. Looks very much like the Danfoss compressor I used on the Frozen Penny..... It took MONTHS of trial and error for the kid I was working with to get the freon blend right..... Too much of one freon got the temps down alright, but the compressor locked up when sucking liquid freon when temps got too low to evaporate the fluid. Another blend just did not cool very well. Several month later...he hit the right mix. He never did tell me exactly what the mix was. He was college bound, and long ago left the freezing scene. It had to achieve the ultimate low temp, but also had to avoid slugging the compressor if the rig went down and temps crashed to minus 40......... I trashed two stock fridge units before I had the custom one built. It still resides in my basement.....and ya never know....... Some day, somewhere, I may fire it up again just for amusement. \ I am rather low on funds these days, but if anybody wishes to fund the experiment again, PM me with about 3 grand and I shall happily rebuild the Frozen One with a current build and see what gives. I can get many more tubes of silicon grease from the auto parts store. I am very curious, but I suspect that the current gen processors won't get the boost that the old high powered toasters did. \\ I'd need access to a experimental CPU with unlocked multi as well. If anybody wants to toss it at me, I will build it. Meow. "Freedom is just Chaos, with better lighting." Alan Dean Foster |
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