Now it is getting a bit colder and I started the machine, the temp readout was at -60°C at this point, good single phase change territory. Went into Windows and pulled off a 3450 MHz OC, easy as pie.
About this time I hook up the fluid temperature probe and see our fluid temp is below zero, about -5°C. I keep pulling the temp down, into cascade territory :-). So I decide, OK let's go for screenshots and try to find the CPU's MAX. So here's 3500 MHz
Getting some seriously cold temps... way past the Cascade Phase-Change setups, easily blasted by 3600 MHz at -100°C, and this is IHS temperature, NOT the base temp!!
So there I am, with 3600 MHz under my belt. The plan is to find a ceiling and come back and run benches at the "sweet spot". The motherboard is starting to have some difficulties about -120°C.... Very bad cold-booting problems, could be the OCZ PSU, too.... they have a reputation for that kind of thing. But I managed to pull it down another 20°C or so.... and pull off 3700MHz+. By this time, the fluid temp is about -10C, just perfect for most motherboard components :-)
So after 3708 MHz, I pull her down to about -135°C and increase the vcore up to 1.92v, get into clockgen and slowly increase the speed, up and up.... 3730, 3760 and at 3796 MHz I get a BSOD
. So immediately I knew it was all about vcore. I shut down the PC and upped Vcore to about 2.0v. I knew from experience that this would net me about 3830Mhz or so and THUS…THE WORLD RECORD!!! At any spot north of Memesama's
3828MHz.... I was sitting at about -140°C and hit the switch, nothing......
and then nothing....
and then nothing…
PC never booted up again. I thawed all out and checked the components.... the board would boot and spin the system and videocard's fan, but no video. The HSF got pretty warm....
I returned home and started testing the individual components; Videocard…OK, RAM…OK. So it's between the FX-55 (doubtful, as it warmed the HSF) the K8N Neo2 (probably) and the OCZ PSU. So that's it.... it's all I've got for you, didn't quite accomplish what I wanted to, but had a lot of FUN!
Lesson #1 from benching LN2 >>>>> Go for your highest best bench FIRST!! Just in case you kill something! Only had a chance to run 1 SuperPi benchmark at 3400 MHz and 24s.
Even had about 5 litres EXTRA LN2!!! After freezing just about everything at work, I even had to throw some away :-(
THE END :D
Just a side note: I've had the board standing on its side for 24 hours now, and it's still dripping!
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