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Which Peltier for BigWater 745 cooling system?

post #1 of 8
Thread Starter 
Hi, I have a P4 550 3.4GHz currently at 3.91GHz (I could make it go faster but I'm just too lazy right now). My cooling system is a Thermaltake BigWater 745 CL-W0076 and it works very well, bringing my cpu at around 32C at 3.91GHz. However, I've been meaning to buy a peltier to further cool my cpu. but I am new to the whole thermoelectric cooling scene and need some help deciding what I should buy for my system.

CPU wattage: 115W

Stock core voltage: 1.4V

Thermal Spec: 72.8C (taken from Intel official specs page)

I have no idea how many C/W my water cooling system can pull, but this is all I know. I'm looking to get around 4.4GHz, so a 1GHz overclock. Help is appreciated. Thanks in advance.
post #2 of 8
Welcome to the forum mate
TEC cooling has its ups and downs, the ups is that you can get very good temps and the downs are numerous. Your water cooling system will most probably not heat be able to handle the rediculous amount of heat generated by the TEC and the CPU. You need an extra PSU with enough grunt to be able to run the TEC which in turn will put your power bill up. You also need to prep your mobo and surrounding components for the condensation problem which will most probably happen. I am no TEC guru but have given it a good crack and still am. My first attempt was on a vid card and was only a 50 watt peltier- failed, another crack was on one of my current rigs using a 226 watt TEC- failed to a point but getting better, still was able to get around 20 - 30 C below ambient. The 226 watter was just not up to the job. Now I have ordered a 437 watt peltier module and with some luck will get the temps sorted out for a very good and safe high OC with my opty 144. (fingers crossed) So having said that don't skimp on low wattage pelts, go straight to something that will do the job properly, there is some around the 300+ watt mark that seem to be able to do the job with the heat generated nowdays but a hard to come by. If I new anything about this sort of extreme cooling it would have saved me lots of money by not buying all sorts of different pelts and power supplies and experimenting. It is very hard to find a guide for TEC cooling a current generation computer as lots of the guides are reletavely old.
If you have never used or even seen a peltier module go and buy a low wattage one and play around with it, they are cheap If you plan on doing it properly then you will have to look into doing a cooling upgrade and then purchase a 437 watt TEC and a very good water block to suit then the PSU to run it. Give it a go, its all good fun, amazing little pieces of equipment!!!
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post #3 of 8
There are a few threads around here that show pictures of melted waterblocks and speak of melted tubing. You need a very stout watercooling loop, and I guarantee there are no pre-made watercooling setups that are anywhere near the efficiency needed to cool a beast of a pelt.I got mine completely custom build with a SeltzL35, 2 heater cores (yes, two cores, not just a dual heatercore) and an automotive radiator fan. This makes it quiet and cool. Idle is -25C and full load is -10C. However, I have a 437w peltier running at peak efficiency (about 50% voltage) and extremely good flow.

Read NoL's TEC guide (sticky at the top of the Peltier/TEC area). It'll show you the basics. We'll help as much as we can!

Edit:
Here's the TEC guide: http://www.overclock.net/peltiers-te...e-1-basic.html
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post #4 of 8
Thread Starter 
Wow. I guess there's alot more to it than buying a simple $50 peltier, because that's what I was assuming. I don't think my parents would be happy with the power bill going through the roof either, so I think I'll pass for now. But thanks for the info, I appreciate it.
post #5 of 8
Quote:
Originally Posted by AuDioFreaK39
Wow. I guess there's alot more to it than buying a simple $50 peltier, because that's what I was assuming. I don't think my parents would be happy with the power bill going through the roof either, so I think I'll pass for now. But thanks for the info, I appreciate it.
Really, the power bill won't rise much if any. The 437w unit pulls about 13 amps at 13.5 volts. That means it's dissipating at around 175 watts of electricity. That's less than your PC PSU. If you're running the peltier at full 24 volts, than it's drawing 25 amps and dissipating 600 watts. That could get expensive. This is because running them at 50% voltage makes them much more efficient than full voltage.
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post #6 of 8
Quote:
Originally Posted by AuDioFreaK39
Hi, I have a P4 550 3.4GHz currently at 3.91GHz (I could make it go faster but I'm just too lazy right now). My cooling system is a Thermaltake BigWater 745 CL-W0076 and it works very well, bringing my cpu at around 32C at 3.91GHz. However, I've been meaning to buy a peltier to further cool my cpu. but I am new to the whole thermoelectric cooling scene and need some help deciding what I should buy for my system.

CPU wattage: 115W

Stock core voltage: 1.4V

Thermal Spec: 72.8C (taken from Intel official specs page)

I have no idea how many C/W my water cooling system can pull, but this is all I know. I'm looking to get around 4.4GHz, so a 1GHz overclock. Help is appreciated. Thanks in advance.
How is the TT Big water 745?

I am thinking about buyibg it, is it quiet? Do you like it? What temps do you get
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post #7 of 8
Quote:
Originally Posted by pcharouz
How is the TT Big water 745?

I am thinking about buyibg it, is it quiet? Do you like it? What temps do you get
I have it as well and I think it's awesome. I'm only using the larger one of the radiators that comes with it, because I was to lazy to cut a hole in my case for the smaller radiator. After installing it I saw an instant temperature drop of 40 deg F at full load. I was hitting 140, once I had it going it was hovering around 100. Which of course enabled me to overclock it even more, hitting 2.75ghz and 113 deg F. still plenty of room to go.
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post #8 of 8
i have the old skool thermaltake bigwater....the first one that was realeased and i hit about 77 degrees farenheit and 24 celcius....not too shabby aye? i havent considered oc'ing my new setup yet as im running some crappy ocz 4-4-4-8 DDR2 ram
    
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