An inlaw has a 2008 Mac Pro and has been debating a machine upgrade. However, to eek some more life out of the current machine, I suggested dropping in a SSD, new video card, and some more ram. I managed to prep a PC card using my 2009 MacPro4,1, which I thought was going to be the hard part -- I'm used to dealing with standard DDR3 dimms and had good luck with whatever I threw at my machine. So I found a 32g FBDIMM kit on amazon - it was only 667MHZ, but for $150 I figured the speed degradation was worth it. Unfortunately it caused all sorts of hassles - we couldn't get the system to recognize all 32G, and even with a reduced setthe system seems to run much, much hotter with the new memory - both the CPU temps and the DIMM temps look about 30-40deg F higher, and the system fans end up maxing out when photoshop is running. With the old memory, the temps stay much more reasonable and the fan doesn't kick into high gear. I had her try using just a few sticks of the new memory, and while it helps, running photoshop still kicks the CPU_MEM and EXHAUST fans >2000rpm. I did see info online mentioning that some FBDIMMs use smaller heat spreaders than Apple ones do, though these seemed the same size as the memory already in the machine. Also, I don't understand why the CPU temp is going up so much with the memory - at first we thought maybe the heatsinks on the CPUS were clogged with dust, but then switching back to the old memory fixed everything - seems like if it was just adequate heat spreaders only the DIMM's would be running hot. So we're going to return that ram, and look for something else. A crucial kit would seem to be the safe bet, but their prices for FBDIMM's are exorbitant IMAO. Can anyone recommend a 'affordable' 8g or 16g kit that works well in this model?