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Larger Radiator = higher temps?!?!

N

Nvidiot

Limp Gawd
Joined
Jan 29, 2001
Messages
179
My setup:

Swiftech MCP600
3/8 ID Tygon
2 x Swiftech 5002 Xeon WB
Danger Den Black Ice Xtreme II dual 12 cm radiator

I recently upgraded from a 6x6x2 radiator which used one 12cm fan and changed to a Black Ice Xtreme II radiator with 2 12 cm fans. I figured that although the new radiator was a little thinner (by ~1/4 '') I would get better cooling for my dual cpu rig (2x12cm fans) . I used to get (idle) 35 C on cpu 1 and 47 C on cpu 0 (second cpu in series). Now I get 42 C on cpu1 and 57 C on cpu0. Also, the system is much less stable as it heats up to 70+ C if I run Prime for 10 minutes or so.

While looking at what could be f'ed up I looked at the water flow through the tubing. I'm not sure if there is a scientific way to tell, but I squeezed the tubing and did not feel water moving past. Also there are some stationary (small) air bubbles in the tubing. I would think these would be moving if water was really flowing. The pump is definitely starting, but I wonder if it somehow stops after a couple seconds. I read awhile ago about someone who had the MPC600 and it just stopped moving water. Mine is about 6 months old, so I wonder if that is what is going on here. I need to look into this a little more, but that is my current theory.

Anyone else run into problems with the MCP600?

-Nv
 
my mcp600 stopped moving water, contacted Swiftech about it and after I went down to their office, they gave me a replacement head for it. try emailing them asking for a replacement head.
 
If you have a MCP600 that is 6 months old then very likely have one from the "faulty batch" (the early ones had issues). Just get a replacement pump head from Swiftech. I got mine for free and it took about 15 seconds to replace. Great performance and no problems since then!
 
Those pumps will destroy your system. I had two of them fail on me. One just stopped moving water, as has been said, and the other had the face crack right off of it.

Get an Eheim and you won't have a problem. Ever.
I suggest a 1250. I currently have four of them in service on my two rigs and two friends rigs which I built. Quiet, heavy duty, reliable.


Aside from the pump, something may be up with your block seating... Reseat the block and see if that helps.
 
if the larger radiator does not hold the water in there as long as the smaler one did, since it is thiner, it mught hurt your flow enough that the water gets too hot for that rad, or your blocks might have gottend un seated partway. but why not just put on the other rad if it worked better?
 
Originally posted by mwarps
Get an Eheim and you won't have a problem. Ever.
I suggest a 1250. IQuiet, heavy duty, reliable.
Click to expand...

Yes , Yes , Yes , Yes , and YES :p
 
the black ice xtreme 2 is NOT the problem in this rig. that rad it top notch and will cool better than any heatercore.

sounds to me eithe rlike the pump as stated, stoppe dmoving water, or the blocks arent seated right as stated. to test the pump

see if its moving water, just look into your RES, and see if there is any turbulance in the res.

take footprints of your CPU's contact with your blocks using thermal grease. make sure they are seated with full contact. last but not least, upgrade to 1/2" ID tubing.


C
 
Originally posted by CaNNoN
the black ice xtreme 2 is NOT the problem in this rig. that rad it top notch and will cool better than any heatercore.


C
Click to expand...

That radiator basically IS a heatercore, so a larger heatcore should easily outperform it.
 
Talked with Michelle at Swiftech and they are going to send me a new pump head. She said that around 2% of their original shipping MCP600's had this issue.

On the Ehiem vs MCP I'm beginning to lean to Ehiem. They have been in the pump business much longer and I believe that they probaby have the best solution. The problem with the 1250 is space and power source. The MCP600 fits nicely in my case and is powered off a 12v Molex connector. The downside on the MCP600 is reliability and the fact that I have noticed that my voltage readings are always down around 11.8 or so on the 12v line. This has happened with an Antec 440W supply and with my new Enermax 550W (EPS) power supply. Allegedly the Enermax supplys 40A across all lines (3.3v, 5v, and 12v) so I guess this should not be a problem. So the MCP600 really puts some hurt on your 12v line.

Does the Ehiem power off external or can it be run off from a Molex?

One other observation I have about inline pumps in general is that the stress of stopping and starting a pump (i.e. turn on and off daily) wears out the impeller motor. And this happens regardless of maker. So, I guess your best long term bet is to leave the pump on 24x7.

If the Danger Den Black Ice Xtreme is NOT the best 2 x 12 cm solution out there then why is it the MOST expensive? Seems like it would be much cheaper if it did not do the job. I will say, however, that whoever did the painting on the one I got really f'ed it up. It chips and peels just touching it. I've had it 1 week and it looks like it has black and gold spots now. Very low quality paint job. I got it from Frozencpu.com, so I do not know if they did it or their vendor.

-Nv
 
Also, what about the Hydor L30 pump. Says it does 320 GPH and it quiet, etc. Any other suggestions?
 
when i said outperform any heatercore, i was reffering to a 6x6x2 heatercore. the BIX2 has double the surface area. so yes a larger rad or HC than a BIX2 would outperform it. but for the size, the BIX2 is the best iv seen.

C
 
Originally posted by CaNNoN
when i said outperform any heatercore, i was reffering to a 6x6x2 heatercore. the BIX2 has double the surface area. so yes a larger rad or HC than a BIX2 would outperform it. but for the size, the BIX2 is the best iv seen.

C
Click to expand...

How does it have twice as much surface area? It looks exactly like my chevette heatercore.
 
Originally posted by CaNNoN
when i said outperform any heatercore, i was reffering to a 6x6x2 heatercore. the BIX2 has double the surface area. so yes a larger rad or HC than a BIX2 would outperform it. but for the size, the BIX2 is the best iv seen.

C
Click to expand...

also take into account that it doesn't use a shroud, which will hurt performance. You could fashion one for it, but then you may as well go for a better performing heatercore. Someone's experiences with the BX2 (though by no means definitive):http://www.ocprices.com/forums/showthread.php?threadid=1402
 
Originally posted by Nvidiot
Does the Ehiem power off external or can it be run off from a Molex?

-Nv
Click to expand...

Yes it can be run from molex , that's how I have mine setup.
 
I broke down and visted the local tropical fish store and picked up a 250 GPH Magdrive pump. It was "only" $72.00. Once I got it installed (boy is it fun switching out a pump with water in the tubing) my temps were back in line where I expected them. CPU0 was around 27C and CPU1 was 35C (idle). Under load the CPU1 temp goes up to 41C, so this looks a bit better than what I had with the older radiator.

When my "replacement" pump head comes for the MCP600 I can probably repair it then sell it on EBay and recover some of the cost for the other pump. Thanks for all the suggestions.

-Nv
 
hey! I'll buy the old pump off of you if the price is right :D I can PayPal too :cool: Lemme know -- pmilam_gz at hotmail.com
 
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