I purchased the OcUK H²Flo Extreme Liquid Dual Fan CPU Cooler when they were on special offer at £43.99 last week (now £64.99) with a view to having a go at fitting it to my 580. This was to be applied to a EVGA GTX 580 DS Superclocked card. It comes with a custom cooler (which is actually poor IMHO) and I had fitted a reference cooler to it which I got brand new unused. So I decided to use this for the modification. The card to be modified Coolermaster Elite 311. I downsized from a Coolermaster 690 due to an impending youngster arrival and having to switch rooms around. Cable routing hmmm (dont look!). Where to mount the double thickness rad hmmm. Decided to mount it at the front for best cooling so out goes the hard drive tray - bit of drilling and hacksaw hacking Relocation of Hard Drives Defrock the GTX 580 Using the existing fan and memory/vrm heatsink. Hit a slight snag in that the two sets of holes located at the four corners of the GPU have raised surrounds which need to be ground off or the copper plate on the CPU block will not touch the GPU. This is the problem of having a square block unlike the Antec 620 which is round and probably misses them. OcUK H²Flo Extreme at the ready Coo look what I found The tie wrap method of fastening the pump block onto the card. I cut a hole out of the cowel to accomodate the pipes and top of the pump and finished it off with thermal tape as a temporary measure. This maybe replaced by a window. Fit everything back into the case. Due to the pipes being too short I made a fan cowel with only the Apache nearest the radiator containing a fan the front two are fanless. A bit of tidying up. I decided to run the pump off my fan controller so I could see the RPM it was doing and also if I wanted I could slow the pump down. As it was I just left it on maximum as you can not hear it. Switch on the PC and get some temps ! Reference Cooler v OcUK H²Flo Extreme My GTX 580 has been overclocked to 850mhz / 1700mhz / 2200mhz so this is what I tested at. Stock volts. At Idle 40c / 28c Full load Furmark 81c / 61c UniEngine 3.0 85c / 68c Gaming 77c to 81c / 51c to 55c (depends on game really) So these are my initial findings and I am well and pretty chuffed £43.99 for a GPU cooler which IMHO is better/cheaper than the Arctic Cooling Air or Hyrdro. Apart from the slight snag of the raised bolt holes the only other issue was the square pump. Its harder to fit than a circular one. The screw holes sit right over the corners of the pump where on a round one it would probably miss. I also think it would be difficult to make a bracket for it too but I might have a go although at the moment there is no reason. I would have also liked to have lapped the copper plate on the bottom of the pump but I could not wait really to try it. So it works a treat The plus side over the Antec 620 was the double thick radiator. The downside is the square pump and shorter pipes.
someone over on the overclockers forum actually makes custom brackets for the 620 for nVidia card, btw. oh, and thanks for posting this right after my 4890 mod haha, makes it pale in insignificance.
Ah sorry its nicely finished though. I know but the OC cooler was much cheaper and had a double thick rad whereas the 620 is only a single. Plus no one to my knowledge had done the OCUK one before.
looks alot like the pump/block from the H100/H70- i believe Dwood on the OCUK forums has made a bracket for that too, I think he does them for $8 or so.
