View Full Version : i7, 2 x MCR 220 overkill?
Camaroz06
03-24-2009, 12:36 PM
Ok I am thinking through my radiator choice again. I am thinking 2 220mcr's for a i7 and maybe the motherboard at a later time. how would 2x220's do with an i7 at higher voltage overclock (maybe 1.47+). I really cant fit a triple or quad so I am limited to 220's for aesthetic reasons.
faster3200
03-24-2009, 12:46 PM
That should work very well. Were you thinking of stacking? Which fans do you plan on using?
Camaroz06
03-24-2009, 12:51 PM
Dont really know on the fans, I know they will be on a controller so I dont care if they are high RPM really. Was hopiong for some LED fans but I dont see anything too promising with LEDs. Maybe have a push pull with the weaker LED fan on the pull portion? would that mess up a stronger fan in a push position?
faster3200
03-24-2009, 12:55 PM
Dont really know on the fans, I know they will be on a controller so I dont care if they are high RPM really. Was hopiong for some LED fans but I dont see anything too promising with LEDs. Maybe have a push pull with the weaker LED fan on the pull portion? would that mess up a stronger fan in a push position?
I don't think it will mess anything up, I just think they won't push as much air though. I actually planned on doing this some time in the future.
When is it overkill? Its just adequate. Not fabulous. The Core i7 is an animal with heat, even at 1.3 volts. 1.47 volts with just a MCR220 Stack? Good luck.
It all comes down to how strong your fans are. With high-speed fans, a double rad could be plenty. But once you start turning them down, your fluid temps are going to start rising. Like IanY said, these chips will seriously dump a metric :banana::banana::banana::banana:load of heat into your water, and whether it's by sheer surface area or raw fan speed, you need to shed the heat into the air somehow.
silverphoenix
03-24-2009, 03:05 PM
I think everyone is jumping the gun thinking they are gonna stack it. Maybe the rad's aren't going to be stacked in which case you will have an equivalent of an MCR480 lol.
Camaroz06
03-24-2009, 03:44 PM
Whoops, sorry the wont be stacked but run in series.
faster3200
03-24-2009, 03:53 PM
Whoops, sorry the wont be stacked but run in series.
Yeah, I just asked the question, I didn't mean for everyone to assume you were.
2xMCR220 wills work fine. I just did some quick testing on stacked MCR220s with a 920 at 3.5ghz and 1.35 vcore HT on, full load with Core Damage. Ambient was a constant 23C. I measured water temp.
My full CPU loop (MCR320 + Stacked MCR220s with 5 Ultra Kaze and 2 Deltas @ 3000RPM each) is the baseline.
Stacked MCR220s @ 3000rpm: 0 deviation from baseline
Stacked MCR220s @ 2000rpm: 0 deviation from baseline
Stacked MCR220s @ 1500rpm: 1C deviation from baseline
Stacked MCR220s @ 1000rpm: 4C deviation from baseline
Of course, these are stacked so with them separate the difference should be even less, especially at lower rpms.
I have my i7 with a series of a MCR220 Stack single fan and a MCR220 double fan, together with a pA120.1 double fan. All fans put out 67 cfm. You would think this combo is fantastic, right? Wrong. Its just enough and I'm running only 1.30 volts. I have tried 1.40 volts and 4.2 Ghz but the heat is overwhelming.
If you are satisfied that's good. Don't expect miracles.
Johmem
03-24-2009, 08:22 PM
Ian, what temps are you getting that are "overwhelming" @1.4V?
ewitte
03-25-2009, 02:54 AM
With 6 slow fans on my single MCR320 extra speed on the fans doesn't do anything for temperatures. I can actually turn the rheostat down to half and its still pretty steady temps. Probably not getting full i7 heat load though.
Eddie3dfx
03-25-2009, 03:44 AM
Picked up my i7 yesterday..
It's on air now, but I'll throw it on the bench tomorrow :)
2 220's seem to be fine.. My old b3 x3210 quad shows as 250watts with the psu calculator (3520mhz @ 1.5v)
I just put in the numbers and a 920 is 250 watts (4000mhz @ 1.35v)
Temps were very high on the x3210 overclocked, but a mcr320 in push pull was more than sufficient. Idle at 37-41c with load at mid/high 60's with an ek supreme.
The only thing that was holding me back was the motherboard, not the temps
Ian, what temps are you getting that are "overwhelming" @1.4V?
On Intel Burn Test.. the system idles in the high 30s. I see cores momentarily hit 66 to 68 degrees, but fluctuate between the mid 50s to the mid 60s. This is at 4.2 Ghz with Hyperthreading and Turbo on.
Even assuming that gaming doesn't stress the temps in this manner, and even assuming that Intel Linpack Burn Test adds 10 extra degrees, anything above the mid 50s is unacceptable to me for what is supposed to be relatively good high-mid end water cooling.
faster3200
03-25-2009, 06:54 AM
On Intel Burn Test.. the system idles in the high 30s. I see cores momentarily hit 66 to 68 degrees, but fluctuate between the mid 50s to the mid 60s. This is at 4.2 Ghz with Hyperthreading and Turbo on.
Even assuming that gaming doesn't stress the temps in this manner, and even assuming that Intel Linpack Burn Test adds 10 extra degrees, anything above the mid 50s is unacceptable to me for what is supposed to be relatively good high-mid end water cooling.
Really? Those temps are perfectly fine. Intel's thermal specs rate a 920 for 68C.
Johmem
03-25-2009, 06:59 AM
Ian, those are similar temps to what I see with my MCR 320. I suggest you check your ambient air to coolant delta if you can. Mine is between 5 and 6 degrees which as I understand it is good cooling system performance. I think those temperatures are normal from what I have been seeing. I'm not sure you can get much lower without extreme cooling like chillers or better.