Water cooling temp trouble

[shadowblade1]

Hi, im running a 3200 and a 7800gtx on a watercooling system i built myself. temps are great at idle (25c cpu) but when i prime i instantly hit around 42c!? do i need to reapply my arctic 5 (i may have gotten air into it) or is this normal? Thanks

[cartmanea]

List all your components, that will help us evaluate it. If it maxes out at 42c though its not too bad. Also remember, motherboard temperature sensors are NEVER accurate.

[shadowblade1]

Dfi ut ultra-d
3200 venice
7800gtx
pc4400 g.skill le (1gb tccd)
2x wd raptors (74gb)
2x wd 320gb drives
2x dvd drives
600w powerstream
tdx wb
maze4 wb
120.3 black ice xtreme
iwaki 20rzlt
tygon

I think thats all the main stuff, need anything else?

[cartmanea]

:slobber: That list almost made me hard. :banana:

The 7800 and Venice do put a pretty good heat dump into the loop. What fans are you using? Are they pulling cool outside air or warm case air into the rad? Also, using a proper shroud?

I agree, temps probably should be better, but if 42c is as high as it gets under load then it isn't bad. Does it go higher than 42c?

Also, what order is your loop in? T-line or reservoir? Maybe a pic of the setup?

Also, in the end, it could be a crappy temperature sensor on the board.

[shadowblade1]

got some 130cfm deltas (3 on rad, 4 more in other holes (got a u2 ufo)) pulling cold from front, hot out back(still cold coming out back) no shroud, pump-cpu-gpu-rad-tline-pump,t-line.

[cartmanea]

Well, they say the radiator should be placed directly before the cpu block so you aren't running the heat from your pump through the cpu block, but it shouldn't make that much of a difference. You also should be using a shroud, at least 1" spacing between fans and the radiator to eliminate the dead spot from the fan hubs. Fans should also be pulling air through the radiator, or in a push/pull combination. If you only have 3 fans on it make sure they are pulling through the rad rather than pushing through it.

What method did you use to apply the thermal compond, spread a thin layer or do a dot in the middle? For cpu's with heatspreaders you should place a BB-sized blob in the middle and let the waterblock spread it out. If you spread it evenly with a credit card or razor then you can get air trapped between them.

[Psyche911]

He says that it goes from 25 to 42 in a short time.
It's not a problem with the water temp. It's either the mounting of the block, or just a really bad temp censor. Maybe it's really not changing more than a few degrees, but it's reading as 17...