Originally Posted by LiamG6
I would suggest you go to customthermoelectric and look at their standard TEC's, http://customthermoelectric.com/tecs_imax.html
pricey, but good quality. I would also look into getting a dedicated server PSU or Meanwell PSU. Meanwell RSP-750-xx can be variable DC with a 2-5.5v DC input to trim the PSU output. Some of the higher voltage TEC's will be much better than the ebay specials so choose your TEC first so you know what voltage you want to aim for. That 15v PSU you have should be fine for benching though. Can you add a fan to the rear heatsink?
This TEC http://customthermoelectric.com/tecs/pdf/19911-5L31-15CQ_spec_sht.pdf
at ~15v ~9a has about 3x the amount of Qc as the ebay special you are using and is only 40mm so can use it with your current water block and should get quite a bit colder than your 12715
PS, love the work you did voltmodding those old 8800's, plus all the rest of the OC mods you do. Got any plans for RX480? Derbauer seems to think the card doesn't have much to give
Good suggestion thanks! I think I will go for one or two of the really high power 40x40 TEC's. My power supply is rated for 30A @ 50V max, but as I found out with my ram project it was really struggling with the single TEC load so I don't trust it anymore and I don't want to burn it up. Surprised you recognized me, you must have been following the 8800 competition, thanks for your kind words. I think the RX480 has a lot to offer and once that thing is uncorked we will see its real potential. Right now they are power throttled because of the cooler, so with better cooling and the power target removed I think we will see some pretty decent things from this card especially considering the price. My budget only allows me to bench old cards, but eventually Ill get my hands on the RX480, even if its just bench and sell.
Originally Posted by OCAddict
I 2nd that suggestion as one of the most critical construction aspects of the peltier is the wires to power it, they have to be the proper gauge wires to support the amperage or they'll overheat to the point the insulation on the wires will melt, plus the attachment point solder has to be properly done.
Yea good call! The wiring I setup is capable of handling 50A for 'chassis' wiring so it should be more than capable of the TEC I am running. I found it interesting that the wires attached to the TEC are officially not rated to handle the listed specs of the TEC but are exactly tuned to the 'actual' observed power limits. This means that they know the exact performance of the junker TEC in order to build it with the appropriate wire, then over sell the specs.
Originally Posted by LiamG6
The brand name TEC's still come with inadequate wires unless you actually specify what you want and pay accordingly. In saying that though, as long as you keep the wire short it is fine. I cut the wires on my tec's down to about an inch or two long and then solder on an EC3 connector, then I solder an 6 or 8 pin pci-e or 8 pin EPS to that and it handles ~200w without any troubles.
back to OP, how cold do you want to go for the ram? you could stack the TEC's to get a greater dT. The heat load of ram is so small you can probably get a cascaded TEC to some very cold temps. Put the 12715 on the bottom and the Customthermo 19911 TEC on the top, can probably run them both on your 15v PSU and see how cold it gets.
Yea that's sorta the same idea I had for wiring the TEC. I wanted to use Deans connectors for ease of use but it serves the same purpose. Also, CASCADE sounds truly epic +1
It never even crossed my mind to cascade them but it makes perfect sense based on the delta T specs.
As for the temp requirements, well, it seems like you wouldn't need much cold to get incredible performance but that's completely wrong. To really get the most out of hot memory like PSC, you need extreme cold like LN2. When I did my DICE run with PSC I couldn't reach the same results as LN2 with the exact same memory so it basically proves that MOAR cold = MOAR better
Obviously the TEC is going to be nowhere near even DICE, but that's ok since this will be for pre-extreme cold testing so I don't need to waste hours of dice figuring out limits and such. I suspect that a cascaded TEC system will give me pretty awesome results though! One thing, wouldn't I want the good TEC closer to the memory (bottom), and the garbage TEC on top cooling the good TEC??
As for the power, I want to eventually use an older ATX PSU so I don't burn up my bench top supply as those are expensive to replace. I was thinking of taking an old junker 600W or so supply and ganging up all the 12V lines to power both TEC's for my new cascade system. Once I get this cascade going then I will try out some hot memory like PSC, I was using MFR for the single suicide run I posted above and those produce almost no heat.
Also, I have plans to try out my H100i and see how that works. I suspect this will change the delta T but maybe it will work ok for the cascade system.