H70 RMA'd, new one runs hotter. Why?

[TickleOnTheTum]

My H70 worked like a dream, apart from one thing. Whenever I first put the PC on the pump made a loud rattling sound. The sound is similar to if you were to say have a wire catching on the fins of a spinning fan, or as if you put a lolly stick in the spokes of your bike... Remember them days?

 

Yet, even the slightest little touch of the case let alone the pump itself and the noise went away for the rest of the day. I checked for all the obvious things like loose fittings, etc.

 

Even when making the noise the H70 cooled extremely well so it did not affecting performance.

 

The noise got louder and louder getting worse so I arranged for a replacement with Amazon.co.uk.

 

This is now fitted and is silent as can be, however, I'm not getting such good temperatures with it as with the old one. On average it is running about 5°C to 10°C hotter. At idle this is not a problem but under full load it can be the difference between 72°C and 82°C!!!

 

Is there something I might have done to cause this? Or that I can do to improve it? For example I have the radiator mounted so that the pipes are at the bottom, would it make any difference to rotate it 180° so that they are at the top?

 

Specs:

i7 920 D0 OC 4GHz (200x20)

Asus P6T Deluxe V2

Vcore = 1.35

CPU Pull = 1.88

[TickleOnTheTum]

OK, maybe, kinda answering my own question here LOL!

 

I have tried pushing and wiggling the pump unit hard against the CPU and then tightened the screws as tight as I could physically get them. Now it seems to be running a little better.

 

Cooler Master Storm Sniper Case

Top fan: 200mm Exhaust

Front & side fans: 200mm Intake

Bottom Fan: 140mm Intake

Corsair H70 Fans: Intake

Corsair Memory Cooler Fan Unit

 

All the fans are connected to cases fan controller so tested at 3 RPMs.

 

OLD H70

Ambient: 19°C ±1°C

 

Minimum (20% ish I think)

IDLE: 35°C - 39°C

LOAD: 71°C - 76°C

 

50% RPM

IDLE: 32°C - 36°C

LOAD: 66°C - 71°C

 

100% RPM

IDLE: 32°C - 36°C

LOAD: 66°C - 71°C

 

 

NEW H70

Ambient: 14°C ±2°C

 

Minimum (20% ish I think)

IDLE: 33°C - 36°C

LOAD:

 

50% RPM

IDLE: 31°C - 35°C

LOAD:

 

100% RPM

IDLE: 30°C - 34°C

LOAD:

 

I'm guessing that if the ambient temp was the same as before then the results would have been about the same.

 

So all good in the end... Unless you know differently?

[andyvee]

possibly a result of the thermal paste curing as well , although not as bad as as5 i did find with my h50 that it got better after a week or so but i also retightened mine after a couple of weeks , the thought being that as the paste settles then the head would not be as tight as it should be .