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1  Hardware and U-Boot firmware / Hardware / Heat: GP+ vs. Dockstar on: October 10, 2010, 11:14:43 AM
I have 2 dockstars and one GP+. In preparation to put on new heat sink, I removed the heat plate on GP+. Then I thought, "I wonder how hot dockstar gets in open air". So I leave dockstar and GP+ CPU in open air, disconnect all network connections. And after 2 hrs idle time, I did my finger test (Still waiting for my cheap IR thermometer). CPU in GP+ is burning hot. CPU on dockstar is warm. I touched the memory chips. And it's same story, memory chip on GP+ give me burning sensation. Yet, memory chips on dockstar is just warm.

Dockstar's power supply provides 12V, and I'm sure there are step down DC/DC converter to down-convert to whatever voltage Marvell CPU needs (2.5 or 3.3V?? Maybe even 1.8V?) As far as I can tell, dockstar and GP+ have same CPU, operate at same frequency: 1.2GHz. And I think even the DDR2 memory is same at 400MHz. So first possible explanation come to mind for the temperature difference is maybe GP+ is operating at higher voltage. Anyone have schematic that shows which DC/DC converter or voltage regulator were used on GP+ and dockstar? Or maybe someone have means to measure Vcc off Marvell CPU directly?
Could the additional power burned was due to 3 DDR2 memory chips?

Thanks in advance for any suggestions.
2  Hardware and U-Boot firmware / Hardware / Re: GuruPlug HeatPlate on: October 06, 2010, 07:29:35 AM
I have the older version with the plate. After I remove it, the gp+ is actually more stable. And I can finally connect both Ethernet if I keep the case open. However, not at gigabit speed. As soon as I connect one of them to my gigabit switch, it goes into never ending reboot cycle. Before I removed the plate, 2x100Mbs would still end up with occasional reboot. Next up, I'll add copper heatsink on Marvell CPU, and see if it helps. It's the hottest part judging by my finger test.
As for Globascale's claim that gp+ could actually run 1x100Mbs + 1x1000Mbs, that's total BS. The only way I could get that running was putting small ice cubes on top of the plate. Always wondering if their testing lab is located inside the arctic circle.


3  General Category / General Discussion / Re: Round #1 - Your feedback required. New SheevaPlug concepts. on: September 27, 2010, 02:26:53 PM
I registered an account just to reply to this message.
Whatever the form factor, I like it to have at least 2 Ethernet ports, and eSATA or USB 3.0 port.

9- Must not come from Globalscale!!!!!
8- Must have the best power efficiency
4- Must be quite and doesn't include any moving parts
9- Must be below $100
2- Must be in the price range $100-$150
7- Must have the smallest footprint possible.
6- Must have the highest processing power available (vs. lowest price/performance).
1- Must be plug computer form factor and pluggable to a wall outlet.
3- Must be packaged within an enclosure (vs.  bare-bones)
5- Must have slick design and look.


green, quite, cheap, small, and powerful enough (>1GHz, >512MB RAM). bare-bone board preferred.

--Unhappy GP+ owner
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