Single or Dual loop for Quad sli?

ok new thread,
Managed to get hold off a 2nd GTX 590 (gift) so was thinking about running current rig in SLI.

I was wondering if I could add a 2nd GTX 590 to this single loop without having much of an increase in my temps?

here is my current spec and pics

Intel 17 980x OC to 4.2
EK-Supreme HF - Full Nickel
Asus Rampage III Extreme
Corsair 1000 w PSU (I think I need to upgrade to 1200w)
OCZ RevoDrive X2 PCI-Express Internal SSD
4 x 7200 rpm 1TB HD No Raid (just used for storage, pics, movies, games, work back up-editing stuff, docs for the family etc)
1 x Blue Ray
1 x CD/RW
4 x Cathode
1 x 5 Channell Fan controller
3 x Dell u2410 (surrond vision)
1 x EK Coolstream 360 Radiator
1 x XSPC RX 360 Radiator
Tygon R3603 7/16" ID - 5/8" OD (11-16mm) Tubing
XSPC Acrylic Dual 5.25" Reservoir for Laing D5
Swiftech Laing D5 Vario MCP655 12V DC Pump
EVGA 590 GTX Hydro Copper x 2

Would be great if I could get away with single loop and still get moderatley cool temps?
Also checked PSU spec the calculator says minimum should be 986W and recommended is 1018 but again hoping I could get by with 1000w or would it be wiser to go with a 1200W?

For the time being only the CPU is overclocked to 4.2

thanks for previous help, any suggestions or advice would be most welcome

thanks

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As great as this rad is, you will need more with a i7 980 and 2x SLI 590's. (especially when you are wanting OC on the CPU.)

Oh...my fault on missing the EK.

You'll want to run a single loop if you are going to run those rads...might as well give all your components the benefit of using all your radiators to keep them cool. If you want to run 2 loops...fine...no real benefit. There are many good arguments that show if you run 2 loops vs. a single loop using the same components, the single, serial loop will out-perform a dual loop simply because every rad is cooling every block...you take advantage of all your cooling in the same loop and not letting some go to waste by 'over-radding' one loop and making par on the other.

I would just stick with the 2x360's... I dont think that another 120mm of radiator will really do a whole lot, for the cost at least.

great you guys have help me save money, again! :-)

I was starting to add up the cost plus I realised might need a 1200 w PSU as I might be pusing it with my 1000w

No probs, here is what I entered and the results from (http://www.thermaltake.outervision.com/Power)

System Type: Single Processor
Motherboard: Regular - Desktop
CPU: Intel Core i7-980X 3333 MHz Gulftown
Overclock: 4212 MHz, 1.3 V
CPU Utilization (TDP): 85% TDP
RAM: 3 Sticks DDR3 SDRAM
Video Card: NVIDIA GeForce GTX 590
Video Type: SLI
IDE HDD 7200 rpm: 4 HDDs
DVD/CDRW Combo Drive: 1 Drive
Blu-Ray Internal Drive: 1 Drive
Sound Blaster - All Models: Yes
Additional PCI Card (avg): 1 Card
PCI-e x4: 1 Card
Fan Controller: Yes
Front Bay LCD Display: Yes
Fans
Regular: 1 Fan 92mm;
High Perf.: 7 Fans 120mm; 2 Fans 140mm;
Water Pumps: Swiftech MCP 655
Keyboard & Mouse (included): Yes
System Load: 90 %

Recommended PSU Wattage: 1099 Watts

:-( I know its the one thing I forgot to plan for, well tbh never thought I would consider SLI, flip side is I can still sell the 1000w to make up the difference, just a pain having to re cable.

thanks again, im all set will post the temps & pics when its all done a bit later

I know I was wondering why we kept getting black outs! Keeping the Energy bill hidden from the Mrs :-)

I think its a little exaggerated as I dont belive the fans are actually high performance ones - they are Scythe Gentle Typhoons not the Deltas and at 1850 rpm (6 in total), the HDDs are hardly used, and I have just 1 Asus Xonar sound card and no front bay LED so should be just below 900 or so

but to be on the safe side a 1100 PSU or more would be wise so ill go for the 1250 OCZ cheaper than the Corsair 1200W

just ordered a OCZ ZX Series 1250W '80 Plus Gold' Modular Power Supply