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Outdoor air + H80i + 8120 = fun times ! (5+ GHz)

post #1 of 3
Thread Starter 
So it was -24 C a few days ago outdoors of my place, I thought it would be fun to see just how much I can OC my 8120, On a closed loop cooler I got it's running a 4.7GHz everyday and does fine. I saw some people reaching 5130 and 5085 in water cooled category. So why not ? I started with the little knowledge I have of insulation for the motherboard and socket just in case, then I thought of a setup so things would work. 1st thoughts: the dirty water in that loop needs to stabilize just above 0 C, I need to make the hot air go out faster, not let the room get like a freezer, fight condensation. I placed back the board in the case, set a fan pointing at the H80i 's radiator/reservoir next to a window which I blocked at other places, and the case after the fan. Next, sealed the whole setup with a tarp and a blanky over it except the top 240mm exhaust fan from the case so everything would go out quick(had a smaller fan letting that air out a tube at top of window). After moving the fan and window for some long time, I finally got some stable temps under load @ my normal 4.7GHX OC. looked like: -12 C motherboard, 8 C CPU and 6 C for the liquid loop. I did a few benchmarks trough all of it and kept going until 5130 GHz, at this point I had hit a wall where the CPU would start heating up to 48 C only while doing a benchmark so I didn't go for the load test as it spiked that temperature in just about 5 seconds! while the motherboard temp remained relatively very low. However I was getting none of those issues at 5085 GHz and it was running cool trough the burnout and benchmark, (hey I even got higher bench scores @ 5185). Here are some pics I took throughout the process ! If anyone has questions, critics, ideas, please do comment !

http://www.passmark.com/baselines/V8/display.php?id=4086257795
http://valid.canardpc.com/show_oc.php?id=2667452
http://valid.canardpc.com/show_oc.php?id=2667397
















post #2 of 3
Any idea what caused that weird spike in the temp when you went from 5 - 5.1GHz?
post #3 of 3
Thread Starter 
I'm still not sure, it's when i go over 22.5 on CPU multiplier, no matter what the OC setup I have of if i lower FSB to 200 still have insane trouble to get stability as soon as I pass that 22.5 and am perfectly fine before(even in burn tests) I think I would need to crank up voltage abit more past that point. But then again a symptom I'm having is heat spike, raising voltage just seems like a horrible idea considering.. Maybe I just reach the maximum energy the moving water would capture while passing the cpu in the loop ? like it would be just a physical limitation of my hardware. Nevertheless I,m quite happy with the day I spent doing it and the results I got !! -- oh and the reason I didnt go higher on the FSB instead is that past that point i would have needed to lower NB + HT multiplier and that performance drop defeated the whole purpose of the OC..
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