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Old January 27, 2011, 05:07 AM
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Hey Guys,

Im finally close to WC my rig, im just missing my tubing and fans. But most of the parts are either here and/or on the way. Anyhow, my dilemma...

I have 2 pumps. A MCP355 w/ XSPC and a 655 vario w/ EK D5 v.2 .

I am planning to WC both my CPU and GPU with 2x 320 swiftech rads. So my question is, would i benefit having the 2 seperate loops? Or just stick with the 655 or MCP355 and keep the CPU and GPU in one loop?
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Old January 27, 2011, 05:31 AM
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Given your specs... I'd probably go with single loop, unless you plan to crossfire another 6950 than I would go dual.
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Old January 27, 2011, 06:06 AM
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I would do single to. Even your cpu + GPU on one Radiator is ok, so One loop.
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Old January 27, 2011, 06:15 AM
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I'd keep the more powerful 355 and put everything in one loop. Sell your 655 for some cash as having a dual loop wouldn't even hurt your temperatures.
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Old January 27, 2011, 07:03 AM
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from what other members have said ( who i trust there judgement ) have told me many times that it just a waste and now you have 2 loops to clean and worry about. my2cents
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Old January 27, 2011, 09:31 AM
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655 + single loop is the best bet dont even bother with dual loops temps arent really any better either i mean hell were talking temps on an i7 around 50-60c and gpus maybe around 55c on average 2x 320 rads is excessive and not even needed a 240mm rad is usually enough for CPU + GPU loop a single 320 rad is also just fine if you feel like using both 320mm rads go for it it wont make temps magically any better but wont hurt either and besides i guess the E peen bonus is worth it to
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Old January 27, 2011, 10:19 AM
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One loop with one rad should cool your setup fine!

I've had an i7 @ 4.2 GHz, Radeon 5870, Rampage 2 Gene motherboard block, all on an MCP355 + Swiftech 320 with 3xS-Flex@1000RPM with reasonable temperatures.
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Old January 27, 2011, 10:46 AM
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Yeah definitely stick with the 355.

Here is some information on pump power (Higher is better):

Head Pressure in PSI at 1.0 GPM of flow (3.8 L/Min)
MCP355 + XSPC Top: 6.40 PSI
MCP655 + EK Top: 4.95 PSI
MCP655 Stock: 4.72 PSI
MCP355 Stock: 4.63 PSI
MCP350 + Top: 4.48 PSI
DCP 4.0 Stock: 3.83 PSI
XSPC 750: 3.59 PSI
MCP350: 3.25 PSI

As you can see the 355 + XSPC Top is easily the most powerful pump available.
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Old January 27, 2011, 11:00 AM
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Quote:
Originally Posted by charliehorse55 View Post
Yeah definitely stick with the 355.

Here is some information on pump power (Higher is better):

Head Pressure in PSI at 1.0 GPM of flow (3.8 L/Min)
MCP355 + XSPC Top: 6.40 PSI
MCP655 + EK Top: 4.95 PSI
MCP655 Stock: 4.72 PSI
MCP355 Stock: 4.63 PSI
MCP350 + Top: 4.48 PSI
DCP 4.0 Stock: 3.83 PSI
XSPC 750: 3.59 PSI
MCP350: 3.25 PSI

As you can see the 355 + XSPC Top is easily the most powerful pump available.
Head pressure isn't all that important in a sealed watercooling loop. The difference in flow rate between a D5 w/ a top and a DDC3.2 w/ a top is almost nil. Plus the D5 is quieter and has the option to slow down the pump.
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Old January 27, 2011, 11:13 AM
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Quote:
Originally Posted by lowfat View Post
Head pressure isn't all that important in a sealed watercooling loop. The difference in flow rate between a D5 w/ a top and a DDC3.2 w/ a top is almost nil. Plus the D5 is quieter and has the option to slow down the pump.
Head pressure does matter, however it's simply a question of whether or not you have enough of it. For the simple loop listed in the OP, either pump would have enough head pressure.

I don't really find the noise produced by the 355 to be a concern, as 1350 RPM yate loons are much louder than it. Additionally, the 655 consumes more power than the 355.

Slowing down the pump is a moderately useful feature, mainly useful for bleeding. (Any setting below 4 is just so weak as to be useless for everyday use).

All in all it's the OPs decision. They are both great pumps, I prefer to the 355 but either of them will work fine for his loop.

I also think he will be able to sell his 655 for a higher price than his 355 because they are a more powerful pump.
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