805 at 3.8GHz on Thermaltake Bigwater

Pandobear

Pandobear

Pandobear

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2 Jun 2006
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Aylesbury, Bucks
Hi Guys

I thought that I would post a few pictures of my setup. I am using the Antec P180 case, which seems to be pretty popular right now and have fitted a Thermaltake Bigwater 745 kit to cool a Pentium D805 running at 3.8GHz. Getting idle temperatures of 45 with load in the high 50s. I know that all the experienced guys recommend staying away from Thermaltake, and I am sure that they are correct, but in this instance it does work. I had previously been using a Arctic Cooler Pro and could run at a FSB of 166, but no higher. I am currently only using one of the radiators that came in the Bigwater kit, due to depth restrictions under my desk, though of cause the extra radiator would add extra scope.

http://uk.pg.photos.yahoo.com/ph/[email protected]/detail?.dir=/7ebfre2&.dnm=5253re2.jpg

I mounted the 240 mm rad over the top blow hole of the P180, so the internal fan is blowing, with the rad fan sucking, this droped the board temperature down 10 degrees from having no top mounted fan, no air flow previously over the Asus stack cool at back of board I guess. I have all the 120mm fans set on their lowest speed apart from the powersupply/hard drive centre divider, so this is a really quiet system. The two thermaltake ones on the rad are a fixed low rotational speed as standard, the other thermaltake one is speed controlled, set as low as it will go.

The pump and reservoir sit at the bottom of the case quite neatly, though I had look at possibly changing to one of the swiftech 5 1/4 bay pump and res models, just to keep the case free. There still appears to be room for a second 7900GTX, though my current mainboard does not support SLI.

http://uk.pg.photos.yahoo.com/ph/[email protected]/detail?.dir=/7ebfre2&.dnm=361fre2.jpg&.src=ph

Anyways, it all seems to work pretty well, very quiet, but can't help wondering if it can be done with Thermaltake, which no one recoommends, how much better it might be with Swifttech or a custom setup.

System Spec

Asus P5LD2 Deluxe
Intel D805 at 3.8GHz
2Gb DDR2 667MHz
4 x Maxtor Diamond max 10 300GB
2 x Western Digital Raptor 150GB
7900 GTX
Antec P180
Antec Phantom 500 watt PSU
 
The pump is rated at 400L per hour, which is similar to the smaller of the swifttech pumps. The flow rate seems ok, with only a couple of degrees difference between the CPU block inlet and outlet. Most people say the problem with these pumps is the pressure, and Thermaltake do not publish figures for this. Anyways my only point is that the Thermaltake may be hopeless next to custom builds, but it does work in this instance. The smaller Bigwater kit has a smaller pump, which has a much lower flow rate.

Does anyone have any idea how this setup would compare with the Swifttech kit? particularly the smaller combined pump and reservoir for the 5 1/4 bay?
 
I can get it to run at 4GHz but the voltage needs to be over 1.6vcore, and I don't think that it is worthwhile upping it that much to gain that extra 200Mhz. It is running at 1.55vcore right now, which I feel a lot more comfortable with! I also notice with this board that the vcore voltage moves around depending on processor loading, if I had bought one of the mainboards with the 8 phase regulator then I would have made it easier to clock.
 
Asus boards are notoriously renowned for Voltage droop which you can only get rid of with some pretty hardcore board modding! While other boards might not have this droop, they will not overclock as far as Asus boards which have long been the best for Intel overclocking.
 
i like it, thanks for putting ya pics up as we have the same kit, for fun ya can drop your rad into some chilled water as well for a bit of benching, makes a big difference and lets ya know what possibilties ya chip has
 
Sumanji said:
Asus boards are notoriously renowned for Voltage droop which you can only get rid of with some pretty hardcore board modding! While other boards might not have this droop, they will not overclock as far as Asus boards which have long been the best for Intel overclocking.
Click to expand...

Theres a cheap mod that can be done with a pencil apparently, see the main 805 thread
 
turbotoaster said:
i like it, thanks for putting ya pics up as we have the same kit, for fun ya can drop your rad into some chilled water as well for a bit of benching, makes a big difference and lets ya know what possibilties ya chip has
Click to expand...

Ice cubes+salt f t w!
Seriously though, that serves as an excellent beer chiller :D

W T F? I'm not allowed to write F T W? :p
 
ob1 said:
Theres a cheap mod that can be done with a pencil apparently, see the main 805 thread
Click to expand...


Yep, worked on my P5ND2 SLi although it is much easier if you take the mobo out of the case first unlike me :p
 
I would try it but can I find a pencil sharpner, no! A knife isnt really getting it to a fine enough point really, try again tommorow :o I have a nice soft 6B pencil though which I assume is good for lots of graphite conducting stuff rubbing off hrm

Ice cubes and salt would make the water -5 or -10 I guess ? But that'd wreck the metal parts I bet, it also increases conductivity if that matters at all
 
I have to post this...

The 'pencil trick' in question was posted by Proth over at XS, and I have to say I bit the bullet last night and gave it a go.

Before I did this trick, I was running 1.35 Vcore for an OC of 3.6ghz on the 805. However, under full load the VDroop would kick and lower it down to 1.30. My Overclock at the moment is limited by this as the more I push the voltage up, the bigger the Vdroop and causes it to be unstable.

So I got a standard HB pencil, broke some of the lead out of it and sharpened it with a knife. Did the mod as described in the thread, and hell what a result.

Now, my motherboard posts a full 0.1 volts over what I set in the BIOS, so initially it set itself to 1.45v :eek:

Not only that, under full stress prime load on both cores, the voltage actually GOES UP to 1.47v :eek::eek:

Very concerned initially, but testing it last night for a couple of hours at a time showed that the temps then went up to much and the processor started to throttle.

So started cranking the BIOS set voltage down from 1.35 and got all the way down to 1.225 volts before the motherboard/cpu was running at a happy temperature, but NO vcore droop any more and more stability. Tested it at 1.225 (1.34 reported Vcore thanks to the Mod) and now is rock solid at with no Vdroop.

Temps are hitting 60C at absolute full load, but no throttling and stable as a rock.

I've posted in my own thread way back what I think is causing the High Temps, I'm now looking forward to getting some W/C in their and hitting the magic 4ghz now the Droop is gone :D
 
Nice one mate, Vdroop is a pita with P4's, they just use so much damn power. you'll never get a seriouse overclock on a P4 unless you do a Vdroop mod, great stuff :)
 
I think that I will have a go at that mod myself. Running the 805 at 4GHz worked, but I had to have the voltage above 1.6 and it would crash on the processor bench part of 3DMark 06, but if I watched the processor voltage it was all over the place, so I will try the mod and see what happens. Cheers guys.
 
I had it stable yesterday till I tried s+m and that got the processor to 74 degrees, I decided to stop the test at that point :eek:
 
ob1 said:
I had it stable yesterday till I tried s+m and that got the processor to 74 degrees, I decided to stop the test at that point :eek:
Click to expand...

Heh, don't worry about it, you will never kill an intel by overheating it, you could take the heatsink off it and it'll not die.
 
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