Brian1965,
The last Tesla unit I saw was a the local particle accelerator and that was a Telsa C2075 (6GB) sitting on a table, which more resembles a conventional GPU- it has a case with fan and single DVI video output. Those however seem to be in the £200+ category. Somewhat expensive as an option, depending on the value of the M2090.
Follows are a couple of quick ideas for a Tesla M2090 cooling solution.
OPTION 1: Adapting GPU Gaming Fan Array to Heatsink:
The logical soluton would be to create a semi-enclosure on the underside of the bottom- cooling fan /heatsink side with a row of horizontal fans, but there is not enough clearance to the case bottom.
This option would use a GTX gaming card triple fan array that replaces the passive heatsink. For example:
EVGA Geforce GTX 980 Ti - Heat Sink & Fans Only - New Unused > £40.00
This is logical as the GTX 980 is about the same size with 6GB of memory and may be in the same league as far as heat dissipation. The mounting holes for the heatsink may be redrilled, but appear in the photo to have a similar spacing to the M2090 passive mounting.
To exhaust the case air, drilling the rear case panel below the M2090, the rear brackets for the M2090, M2. adapter, and the SATA /USB cards should help.
If this would fit, it seems the best and easiest solution.
OPTION 2: Liquid Cooling
This concept replaces the passive heatsink with a closed loop liquid CPU cooler such as the Corsair H90 Hydro All in One. I think this option would have the most effective thermal transfer rate.
The choice would need to be based on the M2090 GPU die size and the heat dissipation rate of the cooler. It looks like a large GPU to me- so choose a version that is for LGA2011 CPU's. Still, if the Tesla C2075 can work with a relatively small diameter fan and heatsink, the M2090 should be adaptable.
To adapt the CPU liquid cooling system:
1. Create a bracket that matches the passive mounting spacing on the M2090
2. Mount the cooling block to the GPU using thermal paste.
3. Mount the radiator. This is a bit of a problem though as the logical spot is the volume at the bottom of the case to the front of the M2090. It would draw cool air from the lower front panel, asssisited by the lower case fans, but the ezxxhaust is into the back volme of the case, adding to the thermal load. The solution would be to cut an opening in the side access panel, and the fan would have to remain in situ whe the access panel is removed- a bit extreme. It's possible though to consider that that the trneral load total in the case is the same as with the passive heat sink. With the C2075, the heat is exhausted through a perforated rear bracket. So, it might be possible to drill the M2090 rear bracket and also drill a regular pattern in the rear panel area under the M2090. With a little study, that area in total may well prove to be adequate.
OPTION 3: Adapting Case Fan Array to Heatsink in Shroud:
This option has the most fabrication, creating a non attached fan shroud that conducts and acclerates the output of a pair of vertcial case fans through the standard M2090 heatsink.
1. The idea is to create a shroud from sheet acrylic mounting on the z620 case bottom on sized grommets to level it.
2. On the vertical side facing the front panel is a pair of 100 or so mm fans connected to a spare 4-pin Molex connector power cable that direct air towards the M2090. These fans are intended to draw and accelerate air entering from the front lower panel.
3. The shroud is tapered in both elevation and plan so as to accelerate the air speed. To mount the enclosure, the Tesla M2090 would be inserted into the enclosure first with the PCIe connection protruding and the assembly inserted in the case so the M2090 could be inserted to the PCIe slot, and then the cooling enclosure as it is actually independent and has some clearance to the M2090, is mounted to the case bottom.
4. The M2090 rear bracket is removed or drilled and the small area of the z620 rear panel is drilled in a regular pattern to create as much air flow through as possible.
5. If possible, another pair of 90mm fans are mounted externally that extract the air from the lower rear case.
6. It would be desirable to also drill the rear panel mounting brackets of the M.2 adapter card and Syba SATA/USB card.
Sorry for the terrible quality of this sketch, but I think it shows the general idea, which is to try and move a volume of air comparable to a server case environment.
Cheers,
BambiBoom_Z