Vincent Diepeveen wrote: > Yes i had received around those release dates already quite some > questions whether my software works on this box. > > Tyan is hammering upon their 'direct connect' architecture. > > At home here i've got a stand alone S2881 mainboard, it just has 2 pci-x > 133Mhz slots. > > It's a pretty good mainboard except that the built in graphics card is > really too slow nowadays for such a mainboard, > even though i'm not doing much graphical at it other than now and then a > 'dir' in a command prompt. > > Having pci-x then is a bad idea. ??? > > It would be pretty bad of course if this 'personal supercomputer' is > just a case with 4 stand alone mainboards without > any form of connection between the boards. > > Note that if you want to buy a real 8 socket machine, tyan has a > different alternative that's more capable of delivering 8 sockets. > It's pretty cheap too. > > It's 2 quad boards that are glued together with interconnects (seems to > me like htx slots by the way), and it works pretty great > and is already operational here and there. > > Behaves as 1 big 8 socket machine. Of course latency from each chip to > the global shared memory is pretty bad as compared to such a S2881 board > and the cpu's for 8xx are more expensive than the 2xx dual core chips. > > That 8 socket machine gets powered then with in total 1300 watt PSU. > > Back on the typhoon 'personal supercomputer'; using gigabit would be a > scandal for such a capable box. > Using 350 watt PSU's is quite risky IMHO if dual cores get put in and > some i/o happens. Similar to what gets put in 1U rackmount cases.
> > The TDP of those dual cores is already 95 watt and up by now. > > That's 180 watt, excluding the watts the PSU will lose for sure, just > for the chips. Add to that some 4 SATA drives. One SATA drive per board. > Each drive if it's a maxtor will be > 22 watt. Then we already are way > above 300 watt at least for 1 psu. 200 watt for CPUs and drive, Maybe 50-60 watt for platform, including mobo, fans, etc. Assume good efficiency from the PS, and it should have a healthy cushion at 350 watt. > > Then usually the financial companies buying toys like this put in a lot > of ram, as that what's what they buy a cluster for, > just the RAM they want to use for usually 1 big memory mapped file. > > That'll eat quite a lot of power too. 350 watt a board is not exactly > what i'd advice. > > 4 x 350 = 1400 watt, without spreading risks over each power supply. > > What if 1 of those psu's fails? >From what I understand, the boards and supplies are independent. > > Vincent <snip> -- Geoffrey D. Jacobs Go to the Chinese Restaurant, Order the Special _______________________________________________ Beowulf mailing list, [email protected] To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
