New 4.2GHz overclock that I stabilized yesterday, 21x200MHz at just 1.360V in CPUZ (1.376V actual). Here is a screen of a run I did with it this morning. Decided to open the balcony and let some fresh air in. Ambient temps around 17C.
64C on the hottest core using LinX (Linpack) 20-pass run with my new cooling setup running a customized CoolIt FZE with a Swiftech MCR220-QP rad and micro res in the loop.
My HeatWare: http://www.heatware.com/eval.php?id=70151
@ 4.2G 1.376v niceOriginally Posted by dejanh
Good chip
wow dejanh!
nice work!
the lowest coolant temp I have had on my boreas so far is just under 18, you got down to 10!
I will try to run 4.2 as you have, not sure I can get 4.2 at 1.376 but I will try - again excellent work!
Tell us some more about your cooling loop - order of components going to/from block, just the cpu? no vc's right?
what pump are you using - low or high flow, is your rad 2x120?, running all 1/4 inch or using reducers? ...
If you are staying subambient with your water you might want to lose the rad.
Based on reading in the tec thread - if your water is subambient the rad will heat it up to room temp.
Last edited by SteveRo; 02-28-2009 at 08:43 AM.
I think I may have learned something new (at least new for me anyway) and maybe rather important for folks using chillers like you and I.
I was running a big floor fan (in the back of the closet) driving air out of the closet AND I was running a pair of 120 fans 3 in. away from the cpu block thinking that this was good for cooling.
Wow what a dolt I am, I turned off these fans and my coolant and cpu idle temps dropped 6C!!!
Prior to this my lowest coolant temps where just under 18, now I am under 12!!
Makes sense when you think about it, if a radiator can heat up subambient water - so can ambient air blowing on the cpu block or the tecs themselves!
Last edited by SteveRo; 02-28-2009 at 08:44 AM.
You can see my build log here http://www.coolitsystems.com/index.p...atid=4&id=3414
There is a diagram there which shows the flow, but basically it is FZE > Block > Rad > Res > Pump > FZE
Using CoolIt's original 1/4in ID tubing and low-flow pump. No reducers or anything like it. Stock CoolIt block (soon to be replaced with a GTZ I think). My goal was not to get really low idles or sub ambient coolant temps, but to shave off and stabilize load temps. FZE alone could not handle the i7 past 4GHz adequately because of two reasons.
1) The coolant volume was too small.
2) Two blocks of TECs cannot cool the coolant adequately to remove all the heat generated by the i7.
Again, the point is only what happens at load. It's a funny game this TEC business lol :p
Oh and by the way...that's 10.7C while loading the chip. On idle I could go lower (probably 5C) but I have the TECs set to run at 100% only to 10C. As soon as I hit lower they go down to 40% power.
Yes this is very true. If you TECs can cool the coolant sufficiently on their own, you do not want to have ambient air trying to cool the coolant. There is a delta between the coolant temp and ambient that you need to observe and then adjust your system accordingly. With the FZE alone my coolant would climb to 37C-38C at 4.2GHz and core temps would hit 95C+ so I knew I needed something to keep the coolant temps in check and allow the TECs to cool the coolant easier. Shaving off 30C+ from peak temps using the FZE alone is no small feat.
I was considering to do some tests without the rad to see what happens in the system then...maybe I'll try this in the next few days...
Last edited by dejanh; 02-28-2009 at 09:49 AM.
My HeatWare: http://www.heatware.com/eval.php?id=70151
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