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Okay so many people think one way or another is better.

I've tested both of them.. they both perform identical really.. I've found that restriction caused by CPU waterblocks will inevitably be the reason that you will see no change in performance (combine that with the fact that flow rates is not a huge factor in water cooling)

BUT THERE IS ONE BIG, BIG FACTOR THAT I'VE FOUND THE HARD WAY THAT MAKES ONE BETTER THAN THE OTHER

Basically it comes down to flow rates within the water blocks to prevent stagnant water.

The following pictures are of two identical waterblocks mounted to identical video cards using identical, parallel tubes to transfer water from one video card to the other.


attachment.php?attachmentid=203010&stc=1&d=1301604365

attachment.php?attachmentid=203011&stc=1&d=1301604365

attachment.php?attachmentid=203012&stc=1&d=1301604365

attachment.php?attachmentid=203013&stc=1&d=1301604365

attachment.php?attachmentid=203014&stc=1&d=1301604397



As you can see, there's clear buildup of gunk on the end of the GPU Waterblock, my assumption is this is where waterflow is the slowest, and as a result of running them in parallel, I believe its created stagnant water...
I used Biocide (PT Nuke and a silver coil) and had 1-2 drops of water-wetter in my 1 gallon mix that was used to fill the loop. The green stuff is probably my UV GREEN Dye from Feaser One

For this discovery, I'm suggesting to stay with GPUs in serial setup.


Hopefully this helps some of you!


PS: I believe this might have also caused my GTX 285's to die on me
 
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Media Server
(15 items)
 
Various snapshots
(3 photos)
CPUMotherboardGraphicsRAM
Intel Core i7 920 @ 4.2Ghz DFI Lanparty UT X58 T3eh8 XFX Radeon HD 6990 4GB G.Skill Pi Series 
RAMHard DriveHard DriveOptical Drive
Mushkin Enhanced Intel 510 Series 250GB SSD Seagate 1.5TB 7200RPM  Sony External USB DVD Combo Drive 
OSMonitorMonitorMonitor
Windows 7 Enterprise 64-bit ASUS VH238H Dell E207WFPc Samsung PN58B650 
KeyboardPowerCaseMouse
Razer Blackwidow Ultimate Corsair AX 1200 Custom MountainMods Monticle 24 w/Acoustics & LCS Logitech G500 
Mouse PadAudioAudio
Razer Destructor Ultrasone H-Fi 780 Custom built up 5.1 surround sound  
CPUMotherboardGraphicsGraphics
AMD Phenom 9950 Black Edition Gigabyte mATX Galaxy Ge-Force GTX460 1GB Radeon HD3200 
RAMHard DriveHard DriveCooling
6GB DDR2 (2x2GB Patriot+2x1GB G.Skill) Western Digital Caviar Black Western Digital Caviar Green Cooler Master GeminII 
OSMonitorKeyboardPower
Windows 7 Home Server Samsung PN58B650  Logitech Dinovo Mini Silverstone 350W 
CaseMouse
Antec Veralis Logitech Dinovo Mini 
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