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Old September 29, 2009, 03:57 PM
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Default PhII 955 WC Characteristics

Ok folks, now that I think I've got my 955be temp sensor issues resolved (still got a second chip on the way to be sure), I'm wondering about other people's experiences with putting these puppies under water.

My current temps under water are 35c/53c w/ 1.45 vcore and 27c ambient.

What I'm wondering is what kind of delta between idle/load folks are seeing with these things under water.... My temps are now more in line with what I was expecting, but I'm still seeing quite a long cool down time from load to idle. Idle to load spikes properly, but once the load is removed the temps seem to drop slowly as they would with air cooling rather than a fairly quick downward spike as I'm used to seeing with other procs under water. It should be noted that the 720be on this same board exhibited what I would consider "normal" load to idle readings, so it's not an "AMD" thing, but it might be something related to amd quads.

I'll post some screenies of my next prime run to demonstrate what I mean, but most WC'ers should get the idea.

What kind of cool down characteristics are you seeing with your 955 (or 965 I suppose as well) under water?
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Old September 29, 2009, 04:22 PM
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Here's what I'm asking about......

This is a quick 5 minute prime.

Pretty easy to pick out where the load was applied, and where it was removed.

The leading edge of the load is what I would normally expect to see on both ends of the load chart. It spikes up immediately and then climbs slowly up from the initial load temp.

The lagging edge of the load is what concerns me. Normally I'd expect to see an immediate drop down to something close to normal idle temps, and then a slow drop down to bottom idle temps. In this case however, the drop is gradual and takes over 2 minutes to get down to what I'd normally expect to see immediately after the load is removed.

Does that make any sense or do I need to explain it a bit better?

What I'm wondering is if other folks with amd quads under water see the same slow drop from full load.
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Old September 29, 2009, 06:39 PM
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Back when I was running a 940BE it would cool down rather quickly on my WC loop. Be it as it may, i was running a 120.3 swiftech rad at that time and had no other blocks in my loop.
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Old September 29, 2009, 06:44 PM
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I've got a push/pull 220 with a single block but I'd still expect to see "normal" WC behaviour. I'm starting to wonder about the Apogee mount on this AM3 Board. It's got spacers that go between the board and the mount, so I'm wondering if I need to shave those off a little bit.
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Old September 29, 2009, 06:52 PM
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I skipped the spacers altogether... they were a bit of a pain and didn't seem to serve a purpose. Oh and when I was looking at temps using HW monitor, I would NOT look at the temperature of the cores, instead I would look at the temperature reported at TMPIN0
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Old September 29, 2009, 06:55 PM
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Quote:
Originally Posted by Cowboy View Post
I skipped the spacers altogether... they were a bit of a pain and didn't seem to serve a purpose. Oh and when I was looking at temps using HW monitor, I would NOT look at the temperature of the cores, instead I would look at the temperature reported at TMPIN0
What was the relationship between the two readings? (I.E. was the one you were using higher/lower, similar but updated more often, etc.......)

My cpu temp is quite high (58c) and doesn't seem to be affected by load.
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Old September 29, 2009, 06:57 PM
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The temp reported @ tmpin0 was actually LOWER than the one reported by the cores and was more in-line with temperatures expected from water cooling.

Also, the temp would fluctuate based on load, and when you turn your fans off while your computer sits at idle.
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Old September 29, 2009, 07:47 PM
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Tried a direct mount (minus the spacers) with no real difference. Still taking about 2 minutes to get from load to idle. (ignore the coretemp "high" it was opened after the load was removed).
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Old September 30, 2009, 06:47 AM
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Something tells me it isn't the Chip perhaps , more in the actual cooling medium reaching normal temps again.
Where is the Rad Mounted SS?

Regards,
ST
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Old September 30, 2009, 01:05 PM
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On the side of my testbed... nothing's changed since the last 4 chips that have been on that board.

Got a new chip in this afternoon... we'll see if it behaves the same way. (Go figure..... just finishing off my 8 hr Prime run @ 3.91G..... ;) ).
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