PDP problem with article

[WaterPeltNoob]

PDP problem with article

I started a WC Peltering project and I came along a small problem when I found out that the article on VH mislead me.

http://www.virtual-hideout.net/guid...mod/index.shtml

That article shows how to rig a PDP (Power Down Protector) to a 12 V relay.

Problem being, after the computer is shut down, the power drawn from the PSU is only 5 Vs because the actual power is taken from wol standby line, which isn't 12V.

http://www.bit-tech.net/review/130/

If I mis-read, please help... If somebody knows how to rig a PDP to relay correctly, please let me know. Thanks.

Ps. I already checked Radio Shack, they don't have a 5VDC coil relay

[Player0]

Power down protector? You want the pumps to stay on after the CPU powers off? I dont know if id bother with it honestly. Ive run systems for years and years without it and never had a problem.

You can find 5v relays. The shack sucks now. You can also supply your own external powersource. Like a DC adapter, which will give you any voltage you want while the main PSU is off.

[WaterPeltNoob]

I thought I needed such a device because even though the peltier is off, it is still really hot and if I don't dissipate that heat, it will transfer back to the CPU core, which isn't good.

But if your experience tells you that I don't need it, then thank god cause the only place I found a half way decent 5VDC relay was on line for $20...

[Player0]

The peltier hotside will only be like 10c hotter than your hot water temps, and only 20-30c above what the CPU die temperatures will be. More heat will transfer to the waterblock than the CPU because its the shortest path for the heat. Even then, your CPU will only get as hot as water temperature, but I doubt it would even get that hot.

Ive had external probes on peltiers and usually, with an adequate cold plate, Ive never seen CPU temperatures suddenly jump up after the pumps shut down.

If your peltier is left on though, you could have a problem ;)

[WaterPeltNoob]

hahah, well, the aux PSU will be turned on and off by a 12V relay, so when the computer is off, the aux PSU will be off.
Thanks for all the help.