Best 12v 40mm Peltier?

[Player0]

I've been playing with pelts on my 9800XT now that it's slightly more worthless. The thing has never overclocked well. I put the DangerDen Maze4-1GPU block on it with the stock 80w peltier. I get 6-8c lower temperatuers, but Im still sitting in the low-mid 50s under GPU load. Thats a good 20c over water temps.

1.) Is that a respectible temp from the 80w on the 9800XT (or similar?)

2.) Anyone know what wattage the R360 puts out?

I measured the peltier, and at 12v it's using 5.6a, although this seems to be slightly variable depending on the temperature. The peltier is working properly, and Im running the Laing D4 pump through this. Im going to pick up a second D4 and run it in series.

The interesthign thing though is looking at the specsheets at TEDist.com. By their 50c hotside charts, the 172w peltier at 12v draws only 5.0a. Thats a good 1/5 Amp less than the 80w at the same voltage. However, considering an input wattage of just under 55w (which Im assuming the R360 is close too), it has a dT of more than 5c better than the 80w!

Same voltage, less amps, 5c better dT??

So why aren't the GPU block guys using 172w peltiers? Do real world numbers not hold up to this? Has anyone compared the two peltiers at 12v?

I don't know if 5c is going to cut it anyway. I'm getting the 172w peltier either way. Is there a bigger 40mm peltier around? Someone needs to make a 40x50mm peltier heh. I just need to decide whether to get a 24v PSU, or a secondary 12v PSU and run 24v. I think this would be smaller. Not sure if I can spare 11a from my PSU.

[noskill]

Hey man, I have 9800 XT and 80 TEC on it too. My temps are very similar (look at mt thread here). I was looking for R360 wattage too, but haven't found anything good. Let us know if you'll find something.

I don't think that using 172W Peltier at half of voltage is good idea. If will work for sure, but I don't see any real reasons for that. For myself I'm going to get that bad-a** 172W Peltier and power it up with 24V.

Also, I haven't seen anything bigger than 172W, 40x40. I've seen 48mm things and 55mm, this won't for for both yours DD and mine MCW50-T ;)

Someone needs to make a 40x50mm peltier heh.

I'm not getting this. What do you mean? You waterblock is using 40x40mm TEC, IIRC.

I just need to decide whether to get a 24v PSU, or a secondary 12v PSU and run 24v.

I'm close to getting two good ATX and making 24V from them instead of buying 24V Meanwell for $120+

[JFettig]

a 172 at 12v is by far the best pelt setup for that card, it can handle over 100watts and consumes only about 6 amps at 12v

Heck, it could even handle a not super overclocked cpu.

Jon

[froudeg]

I just need to decide whether to get a 24v PSU, or a secondary 12v PSU and run 24v.

As you may or may not know, if your planning to run 2 ATX psu's in series to make 24 volts, then you need to disconnect the grounds in the 2nd psu

You must do this as PC psu's do not have floating outputs; you will effectively short the 12volt of the 1st psu to ground. Only problem with doing this is that you can get a bit of an electric shock (only minor) if you touch the casing or ground wires of the 2nd psu as PC psu's are not galvanically isolated, they rely on the casing and 0v lines to be connected to earth to remove any leakage currents.

Btw - i assume you know that the vast majority of ATX psu's require a 10% load on their 5v line for you to use their 12v lines upto their rated maxium. With no load on 5v, you will find the psu either shuts off when you try to load the 12v line, or the 12v line will drop to 10v or less under heavy loads (such as peltiers)

[Player0]

Someone needs to make a 40x50mm peltier heh.
I'm not getting this. What do you mean? You waterblock is using 40x40mm TEC, IIRC.

Well, a 40x50 peltier would actually fit in a lot of GPU blocks meant for 40x40mm peltiers, and the extra peltier elements would improve the Qmax of course. But a 50x50 peltier doesn't easily fit any GPU blocks that im aware of due to the GPU heatsink mounting requirements. If someone like Kyrotherm or something developed a 40x50mm peltier it might be pretty popular. It was just a passing thought :) You can have them custom made for the right price.

My temps are very similar (look at mt thread here)

Very interested in seeing this, but there was no link...can you share? :)

As you may or may not know, if your planning to run 2 ATX psu's in series to make 24 volts, then you need to disconnect the grounds in the 2nd psu

Yeah, I know but thanks for the info :) I wasn't going to get a second ATX PSU, that would be a waste of space since I dont need the other voltage lines. I can make a linear 12v powersupply good for 10a for probably $20-$30. I *might* be even able to change out the transformer in an ATX PSU and get new taps for 24v, and just wire a simple 10a rectifier and some electrolytics for the peltier which doesnt require a lot of powerfiltering. Most likely, just build it seperate. I can build it in to an old CD-Rom case or something so it will fit in the 5-1/4 bay perfectly. We'll see :)

[froudeg]

I knocked up a linear psu myself some time back - 2 huge torroid transformers, large rectifier, huge cap etc - only problem with this is how hot it gets.(both the transformers nd the rectifier heatsink)...the setup i had just about fitted into a ATX psu case (altho it stood somewhat taller)

The chopper transformers in SMP psu's cant be swapped out nd used in the way you describe - doesn't work like that with switch mode psu's.

[jinu117]

Just wondering how would a car/marine battery charger would fit in scenario. Better amperage per price, higher voltage around 13.6v, sounds pretty good to me except the size and potential efficiency. Any ideas ? :)

[noskill]

Well, a 40x50 peltier would actually fit in a lot of GPU blocks meant for 40x40mm peltiers, and the extra peltier elements would improve the Qmax of course. But a 50x50 peltier doesn't easily fit any GPU blocks that im aware of due to the GPU heatsink mounting requirements. If someone like Kyrotherm or something developed a 40x50mm peltier it might be pretty popular. It was just a passing thought :) You can have them custom made for the right price.

I just ordered today 40x40 172W TEC from them ;)

Very interested in seeing this, but there was no link...can you share? :)

Why not? http://www.xtremesystems.org/forums/showthread.php?t=46115

[Player0]

I managed to find someone willing to trade a Meanwell S320 for my spare IC7-Max3 so I'll just use that and bridge it to 24v. Got my 172w pelt today as well. Maybe Ill get it all upgraded by the weekend, get some better GPU speeds.

Been playing HL2 in 1024x768 8x ansi 2x AA but I had to shut down AA in one of the levels last night due to lag. Ick. It doesnt look that much worse. Its the level underground with the slightly wet and puddly tunnels and zombies, a level or two before you have to fight the Striders. I guess all the water and reflections and stuff beat the crap out of it. It runs like glass the rest of the time tho.

[noskill]

I managed to find someone willing to trade a Meanwell S320 for my spare IC7-Max3 so I'll just use that and bridge it to 24v. Got my 172w pelt today as well. Maybe Ill get it all upgraded by the weekend, get some better GPU speeds.

OUCH! Meanwell for IC7-MAX3!

I decided to save ~$90 on that Meanwell, get two FSP ATX PSUs and make some dirt mod with them...

Meanwells are great, but their price... And that 60mm fan is noisy. I think I will replace it with something quiet.

[Player0]

Well, I sold a Max3 and only got like $120 for it, so this wasnt a bad trade hehe.

An ATX would have been too tall to fit my application unfortunately, or I just would have done that.

[noskill]

Well, I sold a Max3 and only got like $120 for it, so this wasnt a bad trade hehe.

An ATX would have been too tall to fit my application unfortunately, or I just would have done that.

Are you going to fit everything in your case?

What's your case? Any pics?

[Player0]

Some pics here, but its set up different now slightly. I have two radiators in there now and a Laing D4

http://www.liquidninjas.com/photopost/showgallery.php?cat=6081