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Spare BOINC-Dedicated Rig

post #1 of 4
Thread Starter 
After buying a new rig, I moved the leftovers from my old rig to various members of the family, and gathered the remains to build Cap'n Crunch (see sig). I didn't think to to a log earlier, so there aren't any pictures or benchmarks from before last night. I took everything out of the case last night in order to regain some leg room under my desk, and everything is now piled on top of my subwoofer. Pictures of that will be coming after I get them off of the camera. Seeing as how the rig was already built, and is now torn apart, this will be more a log of my overclocking and benchmarking experience. Seeing as how all I have is a stock cooler and I'm too poor cheap to buy a decent aftermarket cooler, my O/C will be severely limited by temperature, and I won't be touching voltages (except maybe on the RAM). I currently have 224 MHz x 12.5 to give me 2.8 GHz (compare to 2.5 GHz stock) prime stable for 12 hours, and I'm testing 226 MHz x 12.5 with LinX as I type.

Edit: First round of pictures is here! I'm too lazy to post all the pictures in this thread, but you can view the album here.
Edited by Iislsdum - 12/18/11 at 11:11am
post #2 of 4
Thread Starter 
I'm nearly done finding a 24-hour Prime stable OC. I'm testing at 2.85 GHz as I type. The memory is quite touchy, and won't test stable over DDR2-400 at any reference clock that requires an HT multiplier lower than 5. I haven't been able to put any timings back to 4 from 5 at those reference clock values, either.

I'm thinking of the RAM an extra 0.1 V and seeing what I can do with that, but the modules are packed quite closely together (almost touching) and there is very little airflow over them, which I believe is cause for heat-related concerns. The heat spreaders get warm to the touch when under stress at stock voltage. I'm also thinking of buying a CM Hyper 212 Plus with some money I received for Christmas.
post #3 of 4
Thread Starter 
I've finally settled on 2.8375 GHz for the final overclock. That puts the RAM at ~405 MHz real/810 MHz effective, timings are at stock (4-4-4-12). The reference clock is 227 MHz. After BGB, I might see how far down I can push the VDIMM from the current (stock) 2.2 V.
post #4 of 4
Thread Starter 
Looks like the voltage won't budge on the RAM. The computer was unstable at 46 (0 is 1.8V, 40 is 2.2V in BIOS, 48 is 2.2V measured). I figured that even if I could get it down to 47, the difference would be negligible, and the time would be better spent crunching. This is the end of my testing for the 24/7 overclock, but I might do some benchmarking, and see how high I can get everything without becoming unstable during a benchmark. There aren't too many entries on HWBot for the Brisbane 4800+, so maybe I can even score some points there!
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