On Thu, 30 Sep 2004 00:18:33 +0800, Orlando Andico <[EMAIL PROTECTED]> wrote: > On Wed, 29 Sep 2004 21:04:26 +0800, Winelfred G. Pasamba > <[EMAIL PROTECTED]> wrote: > > On Wed, 29 Sep 2004 18:19:07 +0800, Orlando Andico > > <[EMAIL PROTECTED]> wrote: > > > Recall, the frontside bus is at least 100MHz and 64bits wide. That's > > > 800MBytes/second. There is a separate bus for AGP, memory, and PCI, so > > > it's inaccurate to imply that these devices are all sharing the > > > limited PCI bandwidth. Recall that the north bridge, memory, and AGP > > > controller are not taking PCI bandwidth, but rather frontside bus > > > bandwidth. > > > > the fsb runs at system clock? 800mhz in new motherboards? tama ba? > > actually, no. motherboards still run at 100MHz - 166MHz. you can't run > a motherboard at 800MHz. it's the RAM that runs at the high speed, > actually 100-166MHz, biphase clock (quad-pumped), DDR. > > > > is the AGP useful to postgresql? > > no, i was pointing out that the previous poster's implication that > video cards will rob performance from postgresql is not valid. > > > lastly, what stuff goes thru the northbridge? is that useful in databases? > > of course it's useful. the memory controller is in the north bridge. > the south bridge does I/O, e.g. ISA, PCI. >
so, the 3.0ghz CPU is in the "equator", in the north is a 100-166mhz bridge to the memory controller which connects at 64bit 400mhz to the memory (there can be dual channels in DDR). ganun ba? which one is 800mhz in the new system boards? the L1, L2, L3 caches have to be somewhere in between RAM and CPU right? and in the south of the CPU is the southbridge that runs motherboard speed (100-166mhz). on the otherside of the bridge is the 66mhz 64-bit PCI. and plugged into our 64-bit PCI is our uw320 scsci that says can handle 320Mb/s. from my understanding of the above if the motherboard which runs at 100-166mhz is 64-bit also it will be the bottleneck. another thing, what do they mean when they say "400mhz system bus" in the old RDRAM motherboards? are there any other bridges, busses, etc, that affect database performance? btw, anyone here has tried if the Asus deluxe motherboard in pcxpress can really handle more than 3gigs? and has someone tested its compatibility with adaptec uw320 64-bit scsi controller(s)? tnx again. just trying to understand the hardware as much as the software, all for database performance. maybe understanding hardware will make us cosf efficient in hardware as much as understanding linux makes us cost efficient in software ;) -- Philippine Linux Users' Group (PLUG) Mailing List [EMAIL PROTECTED] (#PLUG @ irc.free.net.ph) Official Website: http://plug.linux.org.ph Searchable Archives: http://marc.free.net.ph . To leave, go to http://lists.q-linux.com/mailman/listinfo/plug . Are you a Linux newbie? To join the newbie list, go to http://lists.q-linux.com/mailman/listinfo/ph-linux-newbie
