fear with that is using CPU's not standard to apple might pose thermal problems with this design.
iunno. just brainstorming here..
I could see this being a potential concern for folks, but in reality I doubt it'll play out. Most of the CPUs I mentioned (save one of the 8-core) are all 130W TDPs. And that falls right in line with the chips Apple is already using; the other 8-core is actually 150W.
I'll bet a dollar Apple has engineered a little wiggle room in the case's design to allow for hotter chips. My dual 3.46Ghz x5690s are
both 130W TDP, and they chug along in my 5,1 just fine. Those are
way more power-hungry than any of the chips Apple has used in the dual 5,1 Pro.
All that to say: I'm betting a 150W TDP chip won't melt the thing down. ;-)
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I haven't seen this yet. can you provide a link please?
Look at the tear down? The GPUs can be pulled from the unit just like the CPU card can. If the GPU units can be pulled from the unit, then they can be upgraded.
Upgraded to what? Well, that remains to be seen. They're a proprietary card at the moment, and only Apple supplies them. So at most, you can buy the D700 cards directly from Apple and upgrade the D300s yourself. But you'll almost certainly pay a boat-load more money to Apple doing it that way.