Jo0

I've been looking at this lately and I've been wondering if I could have good flows going through my loops with this res with 2 MCP355s. For now I'll use one pump and maintain a CPU only loop with a triple 120mm rad (with 3 ultra kaze 3ks on a fan controller). Then I'll make a second loop with a dual 120mm rad (with 90 cfm cooler masters) for a tri-sli set up. Will I be bogging down the performance of my pumps with this, or will it be running in tip top shape like a normal set up would?

http://www.frozencpu.com/products/91...DF&mv_pc=14622

Spawn-Inc

being that XSPC has made 2 of the top 3 performing after market tops for the ddc pumps i would say yes.

i wish i had ddc pumps, i would love that res/pump combo.

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ira-k

Personally I'd keep my CPU on its own loop, 3 GPU's are going to dump a lot of heat and add a lot of restriction. Throw the GPU's on there own little loop, they can run a lot hotter then a CPU and still have good performance.

Those pumps in that res don't look like they would be in series though, it looks like just a shared res with two pumps to me. That really defeats the purpose of running two pumps or two loops, the hotter loop would just heat up the cooler loop with a shared res and it wouldn't gain any head or flow.

But 2-18W DDC in series would give you pretty good performance if the GPU blocks aren't really restrictive. 2 in series will give you twice the head and 30-40% more flow. 2 in parallel are supposed to give you twice the flow and the same head, what little testing I've seen on it seems to give it a lot less then double the flow.

I always liked running 2 of the old orange impeller 18W DDC in series, I use a jetted inlet CPU block and it loves that high head. Plus you have redundancy which I always liked especially on my TEC loops.

I just run them one after the other as close as practical to each other.

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Jo0

Hmm thanks The pumps do run in parallel. I've decided to go against getting the Dual pump res. I'm sure 3 GPUs under stock clocks can maintain good temps on air with their stock cooler in a watercooled CPU case. Also I dont think the pressure coming out of the DDC for the CPU block will help me much since, from my perspective, a faster flow is better in keeping temps low. Maybe I can stick to my MCP 655 loop for the cpu, and then get a Res+pump combo for the GPUs in the future. Or does the 655 and the 355 perform the same temp wise? If so I will revert back to getting the Dual Pump Res.

Wadkiller

Depending on what blocks you use. If you use a very restrictive block like an EK supreme a higher head pressure pump will perform better. The higher head pressure leads to more friction (can't think of a better word) in the block & thus picking up more heat, whereas a high flow block for example the MC-TDX will be better with a more flow like the D5.

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Jo0

I was planning on getting the HK i7 block and the GTX360 rad for my cpu loop. Then for my GPU loop Ill use the EVGA GTX 285 blocks with the MCR220 rad. From what I have read those blocks are the least restrictive. I really just want to get the lowest temps for my money, while keeping everything in my case organized with the least ammount of clutter possible.

rpm666

Although...that res looks like a dirty girl My wife is already expecting me to slap it on the butt lol.

I wish we had some flow + pressure tests regarding that res in a loop.

I think with 3+ GPUs you'll want to do a separate loop. I would do a dual rad for the CPU and a triple for the GPUs. OR just two triples if you have them.

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ira-k

Yeah unless you just want to WC your GPU's there's not much point in it, unless your temp's with a HSF are getting out of hand with your clocks on them.

I air cool everything I can with HSF's and fans and just use WC'ing on my chip where it will do the most good.

The D-5/655 vario and the 18W DDC w/aftermarket top perform about the same in a loop, the DDC will have a little better flow if you have a lot of restriction. I prefer a D-5 in my normal loops and usually use the DDC for dual pump loops where the smaller size helps. But either one will do you fine, just get the one you prefer.

Like RPM was saying a 240 should be fine on the CPU and a 360 on the cards, depending on what rad and fans of course. But get the biggest rad you have room for, the first 120mm of the rad is what costs the most. It's always better to over-rad if you can.

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